Other Useful Everyday Calculators

Age Calculator

Calculate exact age in years, months, and days between two dates. Find the number of days until your next birthday. Calculate exact age in years, months, days, hours, and minutes from any birth date to the current date or a specified future date.

Date Calculator

Add or subtract days, weeks, months, or years to/from any date. Calculate the difference between two dates in any unit. Add or subtract days, weeks, or months from any date. Calculate the exact date difference between two calendar dates.

Time Calculator

Add or subtract time durations. Convert between hours, minutes, seconds. Calculate elapsed time and time differences. Add, subtract, and convert time values. Calculate total hours and minutes between multiple time entries for scheduling and planning.

Hours Calculator

Calculate total hours worked between clock-in and clock-out times. Compute weekly hours, overtime, and earnings. Add, subtract, and convert between hours, minutes, and seconds. Perfect for time tracking, payroll calculations, and project planning.

GPA Calculator

Calculate your GPA on a 4.0 scale from letter grades and credit hours. Includes cumulative GPA and term GPA calculations.

Grade Calculator

Calculate your final grade from assignments, tests, and exams using weighted averages. Find out what you need on the final exam.

Tip Calculator

Calculate the tip amount and total bill per person. Split the check evenly among any number of people. Calculate tip amounts for any bill percentage. Split the bill evenly among any number of people with per-person total calculation.

Fuel Cost Calculator

Calculate fuel cost for any trip based on distance, fuel efficiency, and gas price. Compare costs for different vehicles.

Concrete Calculator

Calculate how much concrete you need for slabs, columns, footings, and steps. Results in cubic yards, cubic feet, and bags.

Square Footage Calculator

Calculate square footage of rooms and spaces. Add multiple areas for total project square footage for flooring, paint, or real estate.

IP Subnet Calculator

Calculate subnet mask, network address, broadcast address, host range, and number of usable hosts for any CIDR notation.

Password Generator

Generate strong, secure random passwords with custom length and character sets. Includes password strength meter and entropy calculation.

Dice Roller

Virtually roll any combination of dice: d4, d6, d8, d10, d12, d20, and custom dice. Perfect for board games and tabletop RPGs.

Gas Mileage Calculator

Calculate fuel economy in MPG or L/100km from miles driven and gallons used. Track and improve your vehicle's efficiency.

Speed Calculator

Calculate speed, distance, or time. Solve for any variable in the speed = distance/time formula. Convert between units. Calculate speed, distance, or time using S = D/T. Supports multiple units (mph, km/h, m/s) for travel, sports, and physics calculations.

Weight Calculator

Convert weight between pounds, kilograms, grams, ounces, stone, and metric tons. Calculate weight on different planets. Convert between weight units (kg, g, lb, oz). Calculate weight from volume and density for shipping, cooking, and scientific purposes.

Mass Calculator

Calculate mass from density and volume, or find any variable in the mass = density × volume equation. Convert between mass units (kg, g, lb, oz) and calculate weight from density and volume for scientific and everyday use.

Density Calculator

Calculate density, mass, or volume from any two known values. Includes a density table for common materials. Calculate density from mass and volume using D = M/V. Supports multiple units for flexible scientific and engineering calculations.

Ohm's Law Calculator

Calculate voltage, current, resistance, or power using Ohm's Law (V=IR) and the power formula (P=VI). Enter any two values.

Electricity Calculator

Calculate electricity consumption cost for any appliance. Estimate monthly and annual power bills based on wattage and usage hours.

BTU Calculator

Calculate the BTU needed to heat or cool a room. Size your air conditioner or heater correctly for maximum efficiency. Calculate BTU heating and cooling requirements for any room. Essential for sizing air conditioners, heaters, and HVAC systems correctly.

Roman Numeral Converter

Convert between Roman numerals and standard (Arabic) numbers instantly. Supports numbers from 1 to 3,999. Convert between Roman numerals and Arabic numbers instantly. Supports values from 1 to 3,999 with standard Roman numeral notation.

Base64 Encode / Decode

Encode text to Base64 or decode Base64 back to plain text. Supports URL-safe Base64 and binary data encoding. Encode text or binary data to Base64 format and decode Base64 strings back to original content for web development and data transmission.

URL Encode / Decode

URL encode special characters for safe use in web addresses. Decode URL-encoded strings back to readable text. Encode special characters in URLs for safe web transmission. Decode encoded URLs back to readable text for web development work.

Time Card Calculator

Calculate total weekly hours from daily clock-in/clock-out times. Automatically computes regular hours, overtime, and gross pay.

Time Zone Calculator

Convert time between any of the world's time zones. Plan international meetings and travel across time zones. Convert between time zones and calculate the time difference. Plan meetings across multiple time zones with accurate conversions.

Day Counter

Count the exact number of days between two dates, including or excluding weekends and holidays. Track deadlines and project timelines.

Day of the Week Calculator

Find out what day of the week any date falls on. Calculate past, present, and future dates instantly. Find the day of the week for any historical or future date. Supports dates from 1900 to 2100 with accurate calendar calculations.

Time Duration Calculator

Calculate the exact duration between two times on the same day or across days. Great for tracking work sessions and events.

Bandwidth Calculator

Calculate download/upload time, network throughput, and required bandwidth for any file size and internet speed. Convert between data transfer units (bps, Kbps, Mbps, Gbps) and estimate file transfer times for network planning and analysis.

Wind Chill Calculator

Calculate the wind chill temperature (feels-like temperature) based on air temperature and wind speed. Uses official NWS formula.

Heat Index Calculator

Calculate the apparent temperature (feels-like heat index) based on air temperature and relative humidity using the NWS Rothfusz equation.

Dew Point Calculator

Calculate dew point temperature and relative humidity from temperature and either dew point or humidity using Magnus formula.

Tile Calculator

Calculate how many tiles you need for a floor or wall. Accounts for tile size, grout spacing, and waste percentage. Estimate how many tiles you need for a floor or wall project including waste factor. Calculate total cost based on tile price per unit.

Roofing Calculator

Calculate roofing material quantities including shingles, underlayment, and ridge caps. Estimates for gable, hip, and shed roofs.

Gravel Calculator

Calculate how much gravel, crushed stone, or sand you need for driveways, paths, and landscaping projects. Results in tons and cubic yards.

Mulch Calculator

Calculate how many cubic yards or bags of mulch you need for garden beds and landscaping areas. Determine how much mulch, soil, or gravel you need for landscaping projects. Calculate cubic yards based on area dimensions and depth.

Stair Calculator

Calculate stair dimensions including number of steps, rise, run, and total stringer length. Ensures IBC/IRC code compliance.

Resistor Calculator

Decode resistor color bands to find resistance value and tolerance. Also calculate series and parallel resistor combinations.

Shoe Size Conversion

Convert shoe sizes between US, UK, EU, and AU sizing systems for men, women, and children. Includes foot length measurement guide.

Mileage Calculator

Calculate IRS mileage reimbursement for business, medical, or charity travel. Track mileage for tax deductions. Calculate fuel efficiency in MPG or L/100km. Track trip costs and compare vehicle fuel economy across different driving conditions.

Horsepower Calculator

Calculate engine horsepower from torque and RPM, or convert between HP, kW, and PS. Estimate quarter-mile time and trap speed.

Tire Size Calculator

Calculate tire dimensions from P-metric tire code (e.g., 225/55R17). Compare two tire sizes and find the speedometer error.

GDP Calculator

Calculate GDP using the expenditure approach (C + I + G + NX). Understand the components of Gross Domestic Product. Calculate nominal GDP using the expenditure approach: GDP = C + I + G + NX. Understand how consumption, investment, and trade affect economic output.

Golf Handicap Calculator

Calculate your golf handicap index based on recent scores. Understand Handicap Differentials and the World Handicap System (WHS).

Molarity Calculator

Calculate the molarity of a solution from moles/grams of solute and volume of solution. Essential for chemistry lab preparations.

Molecular Weight Calculator

Calculate the molecular weight (molar mass) of any chemical formula. Supports complex organic and inorganic compounds. Compute the molecular weight of chemical compounds from their formula. Supports common elements and calculates molar mass accurately.