Calculators

Everyday maths without the spreadsheet. Every calculator shows the formula it used, so you can check the working rather than trusting a black box.

• Percentage Calculator

  Answer the three questions people actually ask about percentages: what is X% of Y, X is what percent of Y, and how much did a value change. Each answer shows its working.

• Percentage Increase Calculator

  Find the percentage increase between two values, or apply an increase to a starting figure. The working is shown so you can check the result.

• Percentage Decrease Calculator

  Find the percentage decrease between two values, or reduce a starting figure by a percentage. The working is shown so you can check the result.

• VAT Calculator

  Add VAT to a net price, or work backwards from a gross price to find the tax it contains. Both directions show the net, VAT and gross amounts.

• Discount Calculator

  Find the final price after a discount and how much you save. The stacked mode handles "extra 10% off sale prices", where the second cut applies to the reduced figure.

• Age Calculator

  Work out an exact age in years, months and days from a date of birth — plus the totals in weeks and days, and how long until the next birthday.

• Date Difference Calculator

  Count the time between two dates in days, weeks and months, with a separate weekday-only total for working out business days.

• Compound Interest Calculator

  See how an investment grows over time with compound interest. Add a monthly contribution and choose how often interest compounds to model a real savings plan.

• Loan Payment Calculator

  Work out the monthly payment on a loan or mortgage, and see how much of the total goes on interest over the life of the loan.

• Salary Calculator

  Convert pay between hourly, daily, weekly, monthly and yearly figures. Set your own hours per week and working weeks per year for an accurate comparison.