Calculators

Radius, diameter, circumference, area. Free, instant, in your browser.

Relative spread: SD as a % of the mean. Free, instant, in your browser.

Combinations and permutations, exact. Free, instant, in your browser.

See how savings grow with compound interest over time. Free, in your browser, no sign-up.

When did conception happen?. Free, instant, in your browser.

Concrete blocks (CMU) for a wall. Free, instant, in your browser.

Enter slab, footing, or column dimensions to get the concrete volume and how many bags of ready-mix you need.

Build a confidence interval for a mean from your sample stats. Free, in your browser, nothing is uploaded.

Estimate interest-only payments and total interest while a house is being built, and the mortgage payment once the construction loan converts. Free, in your browser, no sign-up.

VO₂ max from a 12-minute run. Free, instant, in your browser.

Work out cost per 1,000 impressions from your spend and impressions. Free, in your browser, no sign-up.

Cockcroft-Gault creatinine clearance. Free, instant, in your browser.

See how much interest a credit card balance costs this month and in total, and how long it takes to pay off. Free, in your browser, no sign-up.

Calculate your credit card minimum payment and how long paying only the minimum takes, compared with a fixed monthly payment. Free, in your browser, no sign-up.

Find out how many months it takes to clear a card balance and the interest paid. Free, in your browser, no sign-up.

Calculate your credit utilization ratio across up to three cards, the highest single-card utilization, and how much to pay down to reach 30% or 10%. Free, in your browser, no sign-up.

Volume of a box in cubic feet. Free, instant, in your browser.

Cubic yards from feet and inches. Free, instant, in your browser.

Calculate the current ratio, quick ratio and cash ratio from a balance sheet, plus working capital. Free, in your browser, no sign-up.

Volume and surface area of a cylinder. Free, instant, in your browser.

Compare your current debts with a single consolidation loan: the new monthly payment, the total interest and fees, and whether you actually save. Free, in your browser, no sign-up.

Estimate how long it takes to pay off a debt and the total interest. Free, in your browser, no sign-up.

Calculate the debt-to-equity ratio, debt ratio and equity ratio from total liabilities and shareholder equity. Free, in your browser, no sign-up.

Calculate your debt-to-income ratio and housing ratio, the numbers mortgage and loan lenders check first. Free, in your browser, no sign-up.