Calculator categories
Choose a subject, then find the calculator that fits your question.
287 toolsFinancial calculatorsPlan borrowing, saving, investing and household budgets. Compare scenarios
using your own rates, currency and assumptions.44 toolsMath calculatorsExplore arithmetic, algebra, geometry, statistics and number theory with
transparent formulas and worked examples.31 toolsHealth calculatorsUnderstand adult screening measures, energy estimates and calendar-based
health calculations. These tools explain estimates without making
diagnoses.8 toolsConversion calculatorsConvert measurements, temperature, fuel economy, sizing and data-transfer
units. Check the exact unit conventions before comparing results.24 toolsEveryday calculatorsWork out dates, hours, grades, material quantities, energy costs and other
practical questions using local browser calculations.15 toolsEngineering calculatorsEstimate geometry, electrical quantities, mechanics and chemistry with
explicitly labeled units. Verify designs against applicable standards.8 toolsOther calculatorsUse encoding tools, random generators, IPv4 subnet calculations and other
specialist utilities. Each tool states its scope and limitations.
Calculators by country
CountryUS calculators238 free calculators. Federal tax, paycheck, mortgage, auto, home project, business and state income tax calculators in dollars.CountryIndia calculators101 free calculators. GST, salary and income tax, loans, investments, gold, property and construction calculators in rupees.CountryUK calculators22 free calculators. VAT, payroll and property tax calculators in pounds sterling, based on current HMRC thresholds.