Everyday Calculators
Quick answers to the small calculations that come up at the shop, the restaurant, the kitchen and the calendar: percentages, discounts, tips, dates and unit conversions.
Discount & Tip Calculator
Sale price, stacked discounts, tip and bill splitting
Age & Date Difference Calculator
Exact years, months and days between two dates
Percentage Calculator
Percent of, percent change, increase and decrease
Unit Converter
Length, weight and temperature conversions
Which calculator to use
The percentage calculator covers five common questions, from finding 15% of a number to working out a percentage change. The discount and tip calculator handles stacked discounts and splits a bill and tip between a group. The age and date calculator gives the gap between two dates in years, months and days, plus total weeks and days. The unit converter switches between metric and imperial length and weight, and between Celsius, Fahrenheit and Kelvin.
About these everyday tools
Every calculator here runs entirely in your browser: the numbers you type are not sent to a server. Each page includes the formula used, a worked example you can reproduce by hand, practical tips and answers to common questions, so you can understand the result rather than only read it.
Results are estimates for general information. Please read the disclaimer, and check important figures with a qualified professional or the official source, such as your lender or doctor.