Calculators and converters
Choose a tool or search for the calculation you need.
- Conversions
Currency converter
Convert currencies covered by institutional sources, with the source and rate date clearly displayed.
Open : Currency converter - Dates and time
Age calculator
Calculate age in years, months and days at a chosen reference date.
Open : Age calculator - Dates and time
Date difference
Count elapsed calendar days between two dates in either direction.
Open : Date difference - Dates and time
Add or subtract days
Find a date by adding or subtracting a whole number of days.
Open : Add or subtract days - Dates and time
Time duration
Calculate a duration in hours and minutes, on the same day or into the next day.
Open : Time duration - Dates and time
Decimal hours
Convert hours and minutes to decimal hours and back.
Open : Decimal hours - Dates and time
Day of the week
Find the weekday for any supported date.
Open : Day of the week - Mathematics
Fraction calculator
Simplify a fraction or add, subtract, multiply and divide two fractions.
Open : Fraction calculator - Mathematics
Powers and roots
Calculate a power or an integer-degree root in the real numbers.
Open : Powers and roots - Mathematics
Simple and weighted average
Calculate the arithmetic average of a list, with or without weights.
Open : Simple and weighted average - Mathematics
Basic calculator
Add, subtract, multiply or divide two numbers.
Open : Basic calculator - Mathematics
Ratios and proportions
Simplify a positive integer ratio and find a proportional quantity.
Open : Ratios and proportions - Mathematics
Number rounding
Round a decimal number with an explicit precision and rule.
Open : Number rounding - Everyday life
Discount calculator
Calculate the price after a discount and the amount saved.
Open : Discount calculator - Everyday life
Unit price
Calculate a price per kilogram, liter or item and compare two offers.
Open : Unit price - Everyday life
VAT calculator
Find net, VAT and gross amounts using an entered rate.
Open : VAT calculator - Everyday life
Split bill and tip
Add a tip and split the total exactly between several people.
Open : Split bill and tip - Everyday life
Recipe portions
Scale an ingredient quantity to a new number of servings.
Open : Recipe portions - Mathematics
Random number generator
Generate 1 to 100 integers between inclusive bounds, with possible repeats.
Open : Random number generator - Mathematics
Percentages
Calculate a percentage, a share or a change between two values.
Open : Percentages - Conversions
Unit converter
Convert length, area, volume, mass, temperature, speed, time, pressure and energy between metric and US/imperial units.
Open : Unit converter - Mathematics
Rule of three
Find the fourth value in a direct proportion from three known values.
Open : Rule of three - Health
Adult BMI
Calculate BMI in metric or imperial units and view adult reference categories.
Calculate my BMI