Free online calculators

Counts Monday to Friday working days between two dates, with your own holidays excluded.

Six date tools in one page: date difference, duration, age, workdays and date arithmetic.

Counts the days, weeks and months between two dates.

Estimates what an appliance costs to run from its wattage, daily hours and price per kWh.

Finds the number of hours and minutes between two clock times.

Estimates a monthly mortgage payment including property tax and insurance, and total interest.

Calculates tips and splits bills evenly or by person, with rounding options.

Gives exact age in years, months, days, hours and minutes from a birth date.

Works out monthly instalments on home, car and personal loans, with an amortisation schedule.

Percentage calculator inside a calculator and unit converter site.

Art deco styled tip calculator for working out the tip on a post-workout meal.

Mortgage, auto, personal and student loan calculators with full amortisation tables.

Tire load and inflation calculator that notes it is not a compliance document.

Solves for the missing figure among pre-tax price, tax rate and post-tax price.

Handles trigonometry, logarithms, exponents and factorials in a browser calculator.

Calculator with trig functions, logs and a 20-entry history that keeps working offline after the page loads.

Computes percentages, percentage change and what-percent-of questions in one page of a wider tool site.