Calculators

Add, subtract, multiply, transpose, and invert matrices with adjustable dimensions. Free, in your browser, nothing is uploaded.

Maximum heart rate and training zones by age. Free, instant, in your browser.

Mean, median, mode and range in one go. Free, instant, in your browser.

The middle value, with how it was found. Free, instant, in your browser.

Weight of plate, bar and tube by metal. Free, instant, in your browser.

Most frequent value, with a frequency table. Free, instant, in your browser.

Molarity, or mass needed for a solution. Free, instant, in your browser.

Molar mass in g/mol from any chemical formula, with element shares.

Estimate the monthly mortgage payment, total paid, and total interest. Free, in your browser, no sign-up.

Work out monthly mortgage payments in pounds for a UK repayment or interest-only mortgage, with your loan to value (LTV) and total interest. Free, in your browser, no sign-up.

Weigh up clearing your mortgage now: the early repayment charge you would pay against the interest you would otherwise pay over the rest of the term. Free, in your browser, no sign-up.

See how much interest and how many years you save by overpaying your mortgage every month, with a one-off lump sum, or both. Free, in your browser, no sign-up.

See how much time and interest an extra monthly payment saves on your mortgage. Free, in your browser, no sign-up.

Decide whether buying mortgage discount points pays off: the cost of the points, the monthly saving from the lower rate and the break-even time. Free, in your browser, no sign-up.

See your new monthly payment after recasting a mortgage with a lump-sum payment, the monthly saving, and the interest saved over the rest of the loan. Free, in your browser, no sign-up.

Work out the monthly payment and total interest on a motorcycle loan. Free, in your browser, no sign-up.

Mulch in cubic yards and bags. Free, instant, in your browser.

Times table for any number plus a printable 12 × 12 chart.

Estimate mutual fund returns for a one-time lump sum or a monthly SIP, split into the amount invested and estimated gains. Free, in your browser, no sign-up.

Calculate net profit margin from revenue, cost of goods sold, operating expenses and interest and taxes, alongside operating and gross margin. Free, in your browser, no sign-up.

Add up what you own and what you owe to get your net worth. Free, in your browser, no sign-up.

Estimate your National Pension System corpus at 60, the lump sum you can withdraw, and the monthly pension from the annuity. Free, in your browser, no sign-up.

Enter an initial investment, discount rate, and yearly cash flows to get the net present value.

Enter any 2 of voltage, current, resistance, or power to get the other 2.