Calculators Tools | Free Online Calculators

Generate arithmetic questions, check answers and print worksheets.

Work out percentages, increase, decrease and the difference between two numbers instantly, with a chart.

Convert hours, minutes and phrases into numeric durations.

Calculate return on ad spend, ROI, cost per acquisition and your break-even ROAS, with a chart.

Calculate return on investment, net profit and the annualised return for any project.

Add VAT to an amount or extract it from a VAT-inclusive price at any rate, with a full breakdown.

Find the sale price and your saving, and work out stacked discounts correctly.

Calculate your exact age in years, months and days, plus days lived and time to your next birthday.

Count working days between two dates, excluding weekends and public holidays.

Compute your body mass index and see your health category.

Coming soon

Convert length, weight, temperature, area and volume units instantly.

Calculators