Calculators

Turn any decimal into a simplified fraction or mixed number, with steps.

Convert a decimal to a percentage, and to a fraction.

Deck boards for a deck. Free, instant, in your browser.

Density, mass or volume from the other two. Free, instant, in your browser.

Calculate depreciation for any year of an asset’s life with straight-line, double declining balance or sum-of-the-years’-digits, with book value and accumulated depreciation. Free, in your browser, no sign-up.

C₁V₁ = C₂V₂ stock and diluent volumes. Free, instant, in your browser.

Calculate the final price and how much you save from a percent-off discount. Free, in your browser, no sign-up.

Estimate a company’s intrinsic value with a two-stage discounted cash flow model: five years of growth, then a terminal value, discounted to today. Free, in your browser, no sign-up.

Compare reinvesting dividends (DRIP) with taking them as cash, with monthly contributions, dividend yield and share price growth over time. Free, in your browser, no sign-up.

Calculate a stock’s dividend yield from the dividend per payment and share price, and your yearly dividend income from the shares you own. Free, in your browser, no sign-up.

Divisible by 2 through 12?. Free, instant, in your browser.

Dog years to human years. Free, instant, in your browser.

Work out a down payment and the total cash needed at closing for a home, with the loan amount, monthly payment and whether PMI is likely. Free, in your browser, no sign-up.

How long a download takes at your speed. Free, instant, in your browser.

Enter a room's dimensions to get the wall and ceiling area and how many drywall sheets you need.

Estimate a pregnancy due date from your last period, conception date, or IVF transfer date.

Estimate kidney function (eGFR) from serum creatinine, age and sex with the race-free CKD-EPI 2021 equation, with the matching CKD G stage. Free, in your browser, no sign-up.

Estimate the running cost of an appliance from its wattage and usage. Free, in your browser, no sign-up.

Work out the monthly EMI on a home, car or personal loan, plus the total interest and total payment over the tenure. Free, in your browser, no sign-up.

Powers, including negative and fractional. Free, instant, in your browser.

All factors, factor pairs and prime factors. Free, instant, in your browser.

Calculate the factorial (n!) of a whole number. Free, in your browser, no sign-up.

Posts, rails and pickets for a fence. Free, instant, in your browser.

Estimate an FHA mortgage payment with the 1.75% upfront and annual mortgage insurance premiums (MIP) from 3.5% down. Free, in your browser, no sign-up.