Calculators
Free calculators with clear formulas, worked examples and no sign-up.
Everyday
Tips, fuel costs and other handy household and travel calculations.
Age calculator
Find your exact age in years, months and days, and how long until your next birthday.
Date difference calculator
Find the number of days, weeks and months between two dates, with an optional business-days count.
Electricity cost calculator
Estimate the energy and cost of running an appliance from its wattage, daily usage and your own electricity rate.
Fuel cost calculator
Fuel needed and trip cost from distance, consumption and fuel price.
Tip calculator
Tip, total and each person's share of a bill.
Unit price comparison
Compare up to three products by price per unit to find the cheapest option.