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All calculators

Ten tools, each on its own page with its formula, edge cases and FAQ.

VAT CalculatorAdd or remove VAT both ways, exact formula and rounding rules.Gross to Net SalaryNet monthly and yearly, employer cost, adjustable rate.Loan PaymentPayment, total cost, year-by-year amortization.BMI CalculatorBody mass index, WHO interpretation, limits.PercentageShare, change, discount, the asymmetry trap.Unit ConverterLength, mass, area, volume, temperatures.Days Between DatesCalendar, working, business days, weeks.Password GeneratorLocal cryptographic randomness, entropy shown.Compound InterestFinal capital, monthly deposits, the effect of time.Age CalculatorExact years, months, days and days lived.