Calculators

12 tools

How much more does an equal-principal mortgage cost each month than an annuity? What does 25% off actually save you? How many days are left until the exam? Mental arithmetic tends to get these wrong. These calculators cover loan repayments, compound growth, percentages and discounts, splitting a tip, BMI and daily calories, ages and date differences, plus unit conversion, Chinese RMB amounts in words and IBAN validation. Every calculation runs instantly on your device — change one number and the result updates with it.