34 tools
Calculators & Converters
Percentages, units, VAT, dates and averages.
Add or Subtract Days from a Date
Find the date a number of days, weeks or months away.
Age Calculator
Calculate exact age and the next birthday.
Average Calculator
Mean, median, mode, range and standard deviation.
BMI Calculator
Body mass index from height and weight, metric or imperial.
BMR and Calorie Calculator
Basal metabolic rate and daily calorie needs.
Compound Interest Calculator
See how savings grow with interest and regular deposits.
Data Storage Converter
Convert bytes, kilobytes, mebibytes and more, correctly.
Date Difference Calculator
Count days, weeks and business days between dates.
Discount Calculator
Find the sale price and the amount saved.
Electricity Cost Calculator
What an appliance costs to run per day, month and year.
Fraction Calculator
Add, subtract, multiply and divide fractions.
Fuel Cost Calculator
Estimate the fuel cost of a trip and share it.
GCD and LCM Calculator
Greatest common divisor and least common multiple.
Length Converter
Convert metres, feet, inches, miles and more.
Loan Calculator
Monthly repayment, total interest and amortisation table.
Number to Words Converter
Write a number or an amount out in words.
Percentage Calculator
Solve the three percentage questions in one place.
Percentage Change Calculator
Measure increase or decrease between two values.
Prime Factorization Calculator
Check if a number is prime and find its factors.
Profit Margin Calculator
Turn cost and price into margin and markup.
Random Number Generator
Draw random integers or decimals in a range.
Roman Numeral Converter
Convert numbers to Roman numerals and back.
Rule of Three Calculator
Solve a proportion: if A gives B, what does C give?
Running Pace Calculator
Pace per km and per mile from distance and time.
Salary Converter
Convert pay between hourly, daily, monthly and yearly.
Speed, Distance and Time Calculator
Find speed, distance or travel time from the other two.
Temperature Converter
Convert Celsius, Fahrenheit, Kelvin and Rankine.
Time Duration Calculator
Add and subtract hours and minutes.
Time Zone Converter
Compare a time across several time zones at once.
Tip Calculator and Bill Splitter
Work out the tip and split the bill between people.
Unit Converter
Convert length, weight, volume, speed, area and data units.
VAT Calculator
Add or extract VAT from a gross or net amount.
Week Number Calculator
Find the ISO week number of any date.
Weight Converter
Convert kilograms, pounds, ounces and stones.
About Calculators & Converters
Practical calculators for money, measurement and time: percentages, discounts, VAT, profit margins, unit and temperature conversion, date differences and ages.
Every tool on this page is free and requires no account. Where a tool can run entirely in the browser, it does: your input is not sent to a server, and no copy is stored.