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Classic tools

Four general tools, kept because the previous calculator.pro pointed a lot of old links at them. They are not the point of the site.

The scientific calculator parses an expression. It does not send it to a server. The mortgage tool is the standard fixed-rate annuity. BMI uses the CDC customary formula and the WHO adult cutoffs, and it is a screening index, not a diagnosis. The base converter speaks decimal, binary, octal, and hex, including a fixed-width two’s complement view.

Older currency-converter and ovulation URLs redirect to the homepage. This site does not run a live exchange-rate feed, and it does not publish medical calculators.

Which calculator?

Evaluate an expression

Scientific Calculator

Scientific calculator for arithmetic, powers, roots, and trigonometry. Degrees or radians. The expression stays in the address bar.

Monthly payment and amortization

Mortgage Calculator

Mortgage calculator for a fixed-rate loan. Principal and interest, tax, insurance, HOA, extra principal, and the amortization schedule.

Decimal, binary, and hex

Decimal, Binary, and Hex Converter

Convert decimal, binary, octal, and hexadecimal, with grouped bits and a two’s-complement view.

Body mass index

BMI Calculator

Body mass index calculator in US customary or metric units, with the WHO adult categories. A screening index, not a diagnosis.

Every calculator in this cluster