Ideal Weight Calculator
Calculate your ideal body weight using multiple formulas (Hamwi, Devine, Robinson, Miller). Find your healthy weight range by height.
Enter Values
Fill in the fields and press Calculate to see instant results.
Ideal Weight Calculator: Find Your Target Body Weight
Ideal body weight (IBW) represents the estimated target weight that minimizes health risks and optimizes physiological function for your height and gender. Unlike BMI, which provides a range, ideal weight formulas calculate specific target weights that have been correlated with lowest mortality rates, optimal metabolic function, and reduced chronic disease risk in large population studies.
Our free Ideal Weight Calculator uses four scientifically-validated formulas—Hamwi, Devine, Robinson, and Miller—to estimate your ideal body weight. Each formula was developed through different methodological approaches and for slightly different purposes, primarily in medical and pharmaceutical contexts. The Hamwi formula (1964) was designed for quick estimation of drug dosages. Devine (1974) improved accuracy for anesthesia dosing. Robinson (1983) and Miller (1983) refined Devine's approach with updated coefficients.
All four formulas are height-based calculations that add weight incrementally for each inch above a baseline height (5'0" for women, 5'0" for men). They produce results typically within 5-10 pounds of each other, providing you with a realistic weight range rather than a single rigid number. This calculator shows all four simultaneously, allowing you to see the consensus range.
Understanding your ideal weight helps set realistic goals for weight loss or gain, provides context for your current weight status, and serves as a reference point for health discussions with medical professionals. However, ideal weight is a guideline, not an absolute rule. Factors like muscle mass, bone density, body frame size, and individual genetics mean your personal healthiest weight may differ from calculated IBW by 10-15 pounds in either direction.
💡 Important Context: If you have significant muscle mass from strength training, you'll likely be healthy above calculated ideal weight. Use body fat percentage alongside IBW for complete picture. Ideal weight also doesn't account for age—older adults may be healthiest slightly above young-adult IBW.
When to Use This Ideal Weight Calculator
🎯 Weight Loss Goal Setting
Determine realistic target weight when starting weight loss journey. If currently 30 lbs above ideal weight, you have concrete, achievable goal with health justification. More motivating than vague "lose some weight" goal.
⚕️ Medical Reference
Healthcare providers use ideal weight for medication dosing calculations, anesthesia planning, and clinical assessments. Knowing your IBW helps you understand medical recommendations and dosage decisions.
🏋️ Body Recomposition Planning
Compare current weight to ideal weight while considering muscle mass goals. If you're at ideal weight but want more muscle, you'll need to weigh more. Helps distinguish "need to lose fat" from "need to build muscle" scenarios.
📊 Health Risk Assessment
Being significantly above or below ideal weight correlates with health risks. More than 20% above IBW increases risk for diabetes, heart disease, joint problems. More than 10% below raises concern for malnutrition, osteoporosis, hormonal issues.
💪 Frame Size Adjustment
Use ideal weight formulas as baseline, then adjust for your frame size. Small-framed individuals healthy at 90-95% of IBW; large-framed at 105-110% of IBW. Helps personalize generic formulas.
🔄 Progress Benchmarking
Track journey toward ideal weight range. Celebrate milestones like reaching within 20 lbs, then 10 lbs, then entering the ideal range. Provides concrete progress markers throughout weight loss journey.
Ideal Weight Formula Explanations
Four main formulas are used to calculate ideal body weight. Each has slightly different coefficients but all produce results within a reasonable range.
Hamwi Formula (1964)
Simplest and most widely known. Used for quick rough estimates.
Men:
$\text{IBW} = 106 \text{ lbs for first 5 feet} + 6 \text{ lbs for each additional inch}$
Women:
$\text{IBW} = 100 \text{ lbs for first 5 feet} + 5 \text{ lbs for each additional inch}$
Example: 5'10" male = 106 + (10 × 6) = 106 + 60 = 166 lbs
Devine Formula (1974)
Most widely used in medical practice. Developed for creatinine clearance and drug dosing predictions.
Men:
$\text{IBW} = 50 \text{ kg} + 2.3 \text{ kg for each inch over 5 feet}$
Women:
$\text{IBW} = 45.5 \text{ kg} + 2.3 \text{ kg for each inch over 5 feet}$
Example: 5'7" female = 45.5 + (7 × 2.3) = 45.5 + 16.1 = 61.6 kg = 136 lbs
Robinson Formula (1983)
Refinement of Devine with adjusted coefficients. Often produces slightly higher weights than Devine.
Men:
$\text{IBW} = 52 \text{ kg} + 1.9 \text{ kg for each inch over 5 feet}$
Women:
$\text{IBW} = 49 \text{ kg} + 1.7 \text{ kg for each inch over 5 feet}$
Example: 5'9" male = 52 + (9 × 1.9) = 52 + 17.1 = 69.1 kg = 152 lbs
Miller Formula (1983)
Another refinement of Devine formula. Produces results between Devine and Robinson typically.
Men:
$\text{IBW} = 56.2 \text{ kg} + 1.41 \text{ kg for each inch over 5 feet}$
Women:
$\text{IBW} = 53.1 \text{ kg} + 1.36 \text{ kg for each inch over 5 feet}$
Example: 5'6" female = 53.1 + (6 × 1.36) = 53.1 + 8.16 = 61.26 kg = 135 lbs
Comparison and Interpretation
| Height | Hamwi | Devine | Robinson | Miller | Range |
|---|---|---|---|---|---|
| Male 5'10" | 166 lbs | 177 lbs | 169 lbs | 170 lbs | 166-177 lbs |
| Female 5'5" | 125 lbs | 126 lbs | 127 lbs | 128 lbs | 125-128 lbs |
| Male 6'2" | 190 lbs | 193 lbs | 181 lbs | 181 lbs | 181-193 lbs |
Key Observations:
- All formulas produce results within 10-15 lbs for same person
- Hamwi typically gives lowest estimates
- Devine tends toward higher estimates
- Robinson and Miller fall in between
- Use the range (lowest to highest) as your ideal weight zone
Adjustment for Frame Size:
- Small frame: Subtract 10% from average
- Medium frame: Use average of all four
- Large frame: Add 10% to average
Step-by-Step Calculation Guide
Step 1: Confirm Your Gender
Gender significantly affects ideal weight calculations. Men have more muscle mass and bone density on average, leading to higher baseline weights. Women have more essential fat for reproductive function. Ensure correct gender selection for accurate results.
Step 2: Measure Height Precisely
Stand barefoot against a wall with heels together, back straight, head level (not tilted up or down). Mark highest point of head and measure from floor to mark. Best measured in morning as spine compresses during day (can be 0.5-1 inch shorter evening vs. morning). Record in feet/inches or cm.
Step 3: Input Height into Calculator
Enter your height. Calculator internally converts to inches (formulas use inches for calculations). For example, 5 feet 7 inches = 67 inches total. Ensure you enter feet AND inches separately if using imperial units.
Step 4: Calculate and Review Results
Calculator displays ideal weight from all four formulas simultaneously: Hamwi IBW, Devine IBW, Robinson IBW, Miller IBW. Results typically within 5-12 lbs of each other. This variation shows that "ideal" weight isn't one exact number but a range.
Step 5: Calculate Average and Range
Find the average of all four results—this is your primary ideal weight target. Note the range from lowest to highest formula result. This range represents your ideal weight zone. Example: if formulas give 165, 168, 170, 172 lbs, average is 169 lbs, range is 165-172 lbs.
Step 6: Adjust for Frame Size
Determine your frame size using wrist circumference or elbow breadth test:
Wrist Method:
- Small frame: Wrist <6.5" (men) or <5.5" (women)
- Medium frame: Wrist 6.5-7.5" (men) or 5.5-6.5" (women)
- Large frame: Wrist >7.5" (men) or >6.5" (women)
Frame Adjustments:
- Small: Target 90-95% of average IBW (lower end of range)
- Medium: Target average IBW (middle of range)
- Large: Target 105-110% of average IBW (upper end of range)
Step 7: Consider Body Composition
If you strength train regularly or have athletic build, you may be healthy 10-30 lbs above calculated IBW. Check body fat percentage:
- Men <20% body fat: Likely healthy even if above IBW
- Women <28% body fat: Likely healthy even if above IBW
- If body fat is in obese range (>25% men, >32% women), work toward IBW regardless of muscle mass
Worked Examples
Example 1: Average Height Male
Given:
- Gender: Male
- Height: 5'9" (69 inches)
- Current weight: 190 lbs
Calculations:
- Hamwi: 106 + (9 × 6) = 106 + 54 = 160 lbs
- Devine: 50 + (9 × 2.3) = 50 + 20.7 = 70.7 kg = 156 lbs
- Robinson: 52 + (9 × 1.9) = 52 + 17.1 = 69.1 kg = 152 lbs
- Miller: 56.2 + (9 × 1.41) = 56.2 + 12.69 = 68.89 kg = 152 lbs
Interpretation: IBW range is 152-160 lbs, average 155 lbs. Currently 190 lbs means 35 lbs above ideal weight. Target weight loss of 30-35 lbs to reach healthy range. At 500-cal/day deficit, expect 7-8 months to goal.
Example 2: Tall Female
Given:
- Gender: Female
- Height: 5'10" (70 inches)
- Current weight: 145 lbs
Calculations:
- Hamwi: 100 + (10 × 5) = 100 + 50 = 150 lbs
- Devine: 45.5 + (10 × 2.3) = 45.5 + 23 = 68.5 kg = 151 lbs
- Robinson: 49 + (10 × 1.7) = 49 + 17 = 66 kg = 145 lbs
- Miller: 53.1 + (10 × 1.36) = 53.1 + 13.6 = 66.7 kg = 147 lbs
Interpretation: IBW range is 145-151 lbs, average 148 lbs. Currently 145 lbs places her at lower end of ideal range or potentially 3 lbs below average IBW. Perfectly healthy weight. If she has small frame, 145 lbs is optimal. No weight change needed.
Example 3: Shorter Male with Large Frame
Given:
- Gender: Male
- Height: 5'6" (66 inches)
- Frame: Large (wrist 7.8 inches)
- Current weight: 160 lbs
Calculations:
- Hamwi: 106 + (6 × 6) = 106 + 36 = 142 lbs
- Devine: 50 + (6 × 2.3) = 50 + 13.8 = 63.8 kg = 141 lbs
- Robinson: 52 + (6 × 1.9) = 52 + 11.4 = 63.4 kg = 140 lbs
- Miller: 56.2 + (6 × 1.41) = 56.2 + 8.46 = 64.66 kg = 143 lbs
- Average IBW: 142 lbs
- Large frame adjustment: 142 × 1.10 = 156 lbs
Interpretation:With large frame, adjusted IBW is ~156 lbs. Currently 160 lbs is only 4 lbs above frame-adjusted ideal. If body fat percentage is healthy (<20%), current weight is perfectly fine. If body fat is high, losing 5-10 lbs of fat while maintaining muscle would optimize health.
Example 4: Petite Woman
Given:
- Gender: Female
- Height: 5'2" (62 inches)
- Frame: Small (wrist 5.2 inches)
- Current weight: 125 lbs
Calculations:
- Hamwi: 100 + (2 × 5) = 100 + 10 = 110 lbs
- Devine: 45.5 + (2 × 2.3) = 45.5 + 4.6 = 50.1 kg = 110 lbs
- Robinson: 49 + (2 × 1.7) = 49 + 3.4 = 52.4 kg = 115 lbs
- Miller: 53.1 + (2 × 1.36) = 53.1 + 2.72 = 55.82 kg = 123 lbs
- Average IBW: 115 lbs
- Small frame adjustment: 115 × 0.90 = 104 lbs
Interpretation: Frame-adjusted IBW is ~104 lbs. Currently 125 lbs is 20 lbs above adjusted ideal. However, if she has good muscle mass and body fat percentage is healthy (22-28%), 125 lbs may be her personal healthy weight. Should check body composition before pursuing weight loss.
Example 5: Muscular Athletic Male
Given:
- Gender: Male
- Height: 5'11" (71 inches)
- Current weight: 195 lbs
- Body fat: 15%
- Athletic build, lifts 5×/week
Calculations:
- Hamwi: 106 + (11 × 6) = 106 + 66 = 172 lbs
- Devine: 50 + (11 × 2.3) = 50 + 25.3 = 75.3 kg = 166 lbs
- Robinson: 52 + (11 × 1.9) = 52 + 20.9 = 72.9 kg = 161 lbs
- Miller: 56.2 + (11 × 1.41) = 56.2 + 15.51 = 71.71 kg = 158 lbs
- Average IBW: 164 lbs
Interpretation: He's 31 lbs above calculated IBW, but at 15% body fat, he has ~29 lbs of fat and 166 lbs of lean mass. His IBW formulas suggest 164 lbs total—his LEAN MASS alone exceeds this! This demonstrates IBW limitation for athletes. At 15% body fat, he's very lean and healthy. His personal ideal weight is likely 185-200 lbs. Should ignore IBW and focus on body fat percentage instead.
Practical Applications
🏥 Medical Treatment Planning
Doctors use ideal weight for medication dosing, especially drugs dosed by weight (chemotherapy, anesthesia, antibiotics for obese patients). IBW prevents overdosing in obese individuals where actual body weight would yield excessive doses.
💊 Nutritional Dosing
Dietitians calculate protein needs, vitamin requirements, and calorie targets using IBW for obese patients. Using actual weight overestimates needs; using IBW or adjusted body weight (ABW) provides appropriate targets.
🎯 Realistic Goal Setting
Instead of vague goals ("lose weight"), set specific target: "Reach 155 lbs (my ideal weight range)." Specific, measurable goals with health justification improve adherence and success rates.
⚖️ Weight Maintenance
After reaching weight loss goal, use IBW range (±5-10 lbs) as maintenance zone. If you drift 10+ lbs above your IBW range, time to refocus on nutrition. Provides clear boundaries for weight maintenance.
🤰 Pregnancy Planning
Pre-pregnancy ideal weight determines healthy pregnancy weight gain targets. Starting pregnancy at or near IBW makes pregnancy safer and postpartum weight loss easier than starting obese.
🏋️ Body Composition Goals
Compare IBW to current weight and body fat percentage. If you're at IBW but high body fat (skinny fat), focus on recomposition—build muscle, lose fat, stay same weight. If above IBW with low body fat, you're muscular and healthy.
👴 Aging Reference
Track weight changes against IBW as you age. Gaining 20+ lbs above IBW in middle age increases disease risk. Losing weight and falling below 90% of IBW in old age may indicate muscle loss (sarcopenia) requiring intervention.
🩺 Health Insurance
Some insurance plans use IBW or percent of IBW for qualifying bariatric surgery, approving weight loss programs, or setting premium adjustments. Knowing where you stand relative to IBW provides context for insurance criteria.
Common Mistakes to Avoid
❌ Treating Ideal Weight as Absolute Rule
Consequence: Becoming obsessed with reaching exact IBW number ignores individual factors like muscle mass, frame size, genetics. Leads to unhealthy restriction or dissatisfaction despite being healthy.
✓ Solution: View IBW as general guideline and healthy weight range. Focus on body fat percentage, health markers (blood pressure, cholesterol, blood sugar), and how you feel rather than hitting exact number. Being 10 lbs above IBW with 16% body fat is healthier than at IBW with 25% body fat.
❌ Not Adjusting for Frame Size
Consequence: Small-framed person striving for average IBW becomes too heavy; large-framed person thinking they're overweight when actually at their healthy weight.
✓ Solution: Measure wrist circumference or elbow breadth to determine frame size. Small frame: target 90-95% of calculated IBW. Large frame: target 105-110% of IBW. This 20% range (90-110%) accounts for structural differences.
❌ Ignoring Muscle Mass
Consequence: Athletes and regular lifters have 10-40 lbs more muscle than average person. Trying to reach IBW calculated for average body composition requires losing valuable muscle tissue.
✓ Solution: If you strength train 3+ times per week, use body fat percentage as primary metric, not weight. Men at 12-18% body fat and women at 20-28% are healthy regardless of being above IBW. Consider Katch-McArdle formula using lean body mass instead of height-based IBW.
❌ Comparing Male and Female IBW Incorrectly
Consequence: Couples comparing weights may cause issues when woman weighs more than expected because she's taller, or man thinks he should weigh same as his wife who's same height (men's IBW is ~15-20 lbs higher than women's at same height).
✓ Solution: Never compare across genders—formulas are gender-specific for good reason. Men have more muscle, larger organs, denser bones. At same height, man's IBW is 15-20 lbs more than woman's.
❌ Using Outdated or Single Measurement
Consequence: Using height from driver's license issued at age 18 when you're now 45. Adults shrink 0.5-1.5 inches between ages 30-70 from spinal compression. Old height measurement overestimates IBW.
✓ Solution: Measure height annually, especially if over 40. Even 1-inch height loss changes IBW by 5-6 lbs. Use current, accurate measurements for meaningful calculations.
❌ Rapid Weight Loss to Reach IBW
Consequence: Losing 2+ lbs per week using extreme deficit or crash diet to quickly reach ideal weight causes 40-50% muscle loss, metabolic slowdown, nutrient deficiencies, and rapid regain when unsustainable diet ends.
✓ Solution: Aim for 0.5-2 lbs per week maximum (1% of body weight per week). If 40 lbs above IBW, expect 8-10 months to goal. Slow, sustainable weight loss preserves muscle and maintains metabolism. Use 500-750 calorie daily deficit, strength train 3×/week, eat adequate protein (0.7-1g per lb target weight).
Frequently Asked Questions
What is ideal body weight and why does it matter?
Ideal body weight (IBW) is a scientifically-derived estimate of the weight at which an individual of a given height and gender has the lowest health risks and optimal physiological function. Unlike body mass index (BMI), which provides a broad range, IBW formulas calculate specific target weights that research has correlated with:
- Lowest mortality rates: Large epidemiological studies found certain weight-to-height ratios associated with longest lifespans
- Reduced chronic disease risk: Weights near IBW correlate with lower rates of type 2 diabetes, cardiovascular disease, hypertension, and certain cancers
- Optimal metabolic function: Hormonal balance, insulin sensitivity, and metabolic efficiency peak near ideal weight
- Best medication responses: Many drugs are dosed based on IBW because it represents physiologically active tissue without excess fat
Why it matters practically: IBW provides concrete, personalized target backed by medical research rather than arbitrary weight goals. However, IBW is a population-level estimate that doesn't account for individual factors. Your healthiest weight may differ from calculated IBW by 10-15 lbs due to muscle mass, bone density, frame size, and genetics.
Which ideal weight formula is most accurate?
No single formula is definitively "most accurate" because they were all developed for different purposes and validated on different populations:
- Hamwi Formula (1964): Simplest formula, tends to estimate 5-10 lbs lower than others. Best for quick rough estimates and small-framed individuals.
- Devine Formula (1974): Most widely validated in medical literature, considered standard. Best for general population and medication dosing contexts.
- Robinson Formula (1983): Refinement of Devine based on larger dataset. Very similar to Devine, typically within 2-5 lbs. Best for average to tall individuals.
- Miller Formula (1983): Another Devine refinement with different coefficients. Falls between Devine and Robinson typically. Good for cross-validation.
Best approach: Use all four formulas and calculate the average. The consensus among formulas is more meaningful than any single formula. For a 5'9" male, average is 169 lbs with a healthy range of 160-177 lbs. Being anywhere in this range is ideal.
For highest accuracy:Combine IBW with body composition assessment. If you're at calculated IBW but have high body fat percentage (>25% men, >32% women), you may need fat loss and muscle gain. If you're above IBW but low body fat (<18% men, <25% women), you're likely muscular and healthy.
Does ideal weight change with age?
Standard IBW formulas don't account for age, but optimal weight does change across lifespan:
Young adults (20-40): Should target standard IBW ranges calculated by formulas. This is when body composition is typically optimal with good muscle mass and moderate fat levels.
Middle age (40-60): May see slight weight gain from muscle if strength training, or need to fight against fat gain from metabolic slowdown. Maintaining IBW or slightly above is healthy if body composition is good.
Older adults (65+): May actually be healthier 10-15 lbs above young-adult IBW. Extra weight provides reserves during illness, correlates with better outcomes in elderly, and protects against frailty. Very lean elderly face higher risks.
Focus on maintaining muscle mass rather than hitting same weight as at age 25. Age-related muscle loss (sarcopenia) is the real enemy, not slightly higher scale weight. Combine strength training with adequate protein intake to preserve lean mass.
How does body frame size affect ideal weight?
Body frame (small, medium, large) significantly affects healthy weight range because it reflects bone structure and body build, not fat or muscle mass:
Small-framed individuals: Have thinner bones, narrower shoulders and hips, and smaller joints. Healthiest at lower end of IBW range or even 10-15 lbs below calculated IBW. Skeleton weighs less, so total healthy weight is lower.
Large-framed people: Have bigger bone structure, wider build, and larger joints. Healthiest at upper end of IBW range or 10-15 lbs above calculated IBW. Skeleton weighs more, naturally supporting higher total weight.
Determining frame size:Measure wrist circumference (simplest method). For men: <6.5" = small frame, 6.5-7.5" = medium frame, >7.5" = large frame. For women: <5.5" = small, 5.5-6.5" = medium, >6.5" = large.
Important caveat: Most people overestimate their frame size. True large frames are uncommon—most claiming "big bones" actually have excess body fat, not genuinely large skeletal structure. Be honest in your assessment.
Can muscle mass make you heavier than ideal weight?
Absolutely. IBW formulas were designed for average body composition with typical muscle-to-fat ratios found in general population. Athletes, bodybuilders, and regular strength trainers have significantly more muscle mass than average, making them 10-30+ lbs heavier than IBW while being perfectly healthy with low body fat.
Why muscle changes the equation: Muscle is denser than fat tissue—same volume weighs more. Someone with 180 lbs of lean mass needs to weigh at least 180 lbs before any fat is added. If their IBW formula suggests 165 lbs, it's impossible to be at "ideal" weight without losing valuable muscle tissue.
Example: A male athlete at 195 lbs with 15% body fat has ~29 lbs fat and 166 lbs lean mass. His IBW formulas might suggest 164 lbs total—his LEAN MASS ALONE exceeds the "ideal" total weight! Clearly, 195 lbs is his healthy weight, not 164 lbs.
Solution: If you strength train 3+ times per week consistently, use body fat percentage as your primary health metric, not weight or IBW. Men at 12-18% body fat and women at 20-28% body fat are healthy regardless of being "above ideal weight." Focus on body composition, not scale numbers.
Related Health Calculators
BMI Calculator
Calculate Body Mass Index to see how IBW relates to BMI healthy weight range. IBW typically falls in upper-middle portion of BMI's 18.5-24.9 range.
Body Fat Calculator
Essential complement to ideal weight. You can be at IBW with high body fat (skinny fat) or above IBW with low body fat (muscular). Body composition matters more than weight.
BMR Calculator
Calculate Basal Metabolic Rate to understand calorie needs for reaching ideal weight. Your BMR changes as you approach IBW—recalculate every 10-15 lbs.
Calorie Calculator
Determine daily calorie targets for reaching ideal weight safely. Calculate deficit needed (500 cal/day for 1 lb/week loss) to estimate timeline to IBW.
TDEE Calculator
Calculate Total Daily Energy Expenditure to set realistic calorie intake for weight loss toward ideal weight. More accurate than BMR alone for active individuals.
Macro Calculator
Calculate protein, carb, fat targets for reaching ideal weight while preserving muscle mass. Adequate protein (0.7-1g per lb of target ideal weight) crucial during weight loss.
Height Calculator
For parents wondering child's adult height and thus future ideal weight. Predicts adult height from parents' heights using mid-parental height method.
Water Intake Calculator
Calculate daily water needs during journey to ideal weight. Proper hydration supports metabolism, reduces water retention, and aids fat loss.
Conclusion
Ideal body weight provides a valuable reference point for setting health and fitness goals, but it should be viewed as a guideline rather than an absolute target. The four formulas—Hamwi, Devine, Robinson, and Miller—produce a reasonable range that represents healthy weights for most people of a given height and gender. However, individual factors like muscle mass, bone density, body frame, and genetics mean your personal healthiest weight may differ from calculated IBW.
Use ideal weight calculators as one tool among many for assessing your health status. Combine IBW with body fat percentage measurements, waist circumference, health markers (blood pressure, cholesterol, blood glucose), and overall fitness level for a complete picture. If you're significantly above IBW with high body fat percentage and poor health markers, working toward your ideal weight range makes sense. If you're above IBW but have low body fat, good muscle mass, and excellent health markers, you're likely already at your personal ideal weight.
When pursuing weight loss toward ideal weight, prioritize sustainable approaches: aim for 0.5-1 lb per week loss, strength train to preserve muscle, eat adequate protein (0.7-1g per lb body weight), and focus on building lifelong healthy habits rather than quick fixes. Your ideal weight is not just a number on the scale—it's the weight at which you feel strong, energetic, healthy, and can maintain long-term without constant struggle.
People Also Calculate
Calculators visitors commonly use alongside this one.