Everyday calculators

Dates, ages, working hours and unit conversions — the small sums that come up every day.

• Age calculatorExact age in years, months and days.
• Days between dates calculatorDays, weeks, months and working days between two dates.
• Add days to a dateDate after adding or subtracting days, weeks, months or years.
• Hours calculatorHours and minutes between two times, minus breaks.
• Unit converterLength, weight, temperature, volume, area, speed, time and data.

All calculators

• Finance calculatorsLoans and mortgages, saving and investing, pay, prices and business numbers. Every calculator shows the arithmetic behind its answer and works in 22 currencies.
• Income tax calculators by countryEvery country taxes pay differently, so each calculator here follows that country's own rules — brackets, allowances, social contributions and credits — for the current tax year. Pick your country to see your take-home pay.
• Health and fitness calculatorsBody measurements, energy needs, pregnancy dates and training pace, in metric or US units. These are estimates for general information, not medical advice.
• Math calculatorsA full scientific calculator plus quick tools for percentages, fractions, averages and random numbers, each with the working shown.