Our free online calculators cover the everyday math you actually run into — working out a percentage, budgeting a loan repayment, checking a BMI, counting the days to a date, or converting between metric and imperial units. Each one runs instantly in your browser as you type, with no sign-up and nothing to install.
What you can work out here
The collection spans four kinds of everyday calculation, so you can reach for the right tool without hunting through a single overloaded calculator:
- Money — the loan, EMI and amortization calculator turns an amount, rate and term into a monthly payment and a full repayment schedule, while the percentage calculator handles discounts, tips and change over time.
- Health — the BMI calculator classifies your weight against the standard World Health Organization bands, and the pregnancy due-date calculator estimates a due date and gestational age.
- Dates and time — the age and date calculators find exact spans between dates or add and subtract days.
- Everyday math — the scientific calculator handles trigonometry, logarithms, powers and roots, and the unit converter switches between length, weight and temperature.
How to choose the right one
Pick by the question you are asking rather than the numbers you have. If the answer is an amount of money over time, start with the loan or percentage calculator. If it is a span of time, use the age or date calculator. If it is a single conversion between units, the unit converter is fastest. Every calculator shows its working — the formula and, where it helps, a worked example — so you can check the result rather than take it on trust.