Convert temperature instantly — type a value, pick your units, and every other common unit updates live below. 100% free, runs entirely in your browser, no sign-up.
Every unit below updates live from the value you enter in the "From" field above.
Temperature scales aren't simple ratios of each other because they don't all start counting from the same zero — Celsius sets 0° at water's freezing point, Fahrenheit sets 0° at a brine mixture Daniel Fahrenheit used in 1724, and Kelvin sets 0 at absolute zero, the coldest temperature theoretically possible. That's why converting Celsius to Fahrenheit needs both a multiply and an add (°F = °C × 9⁄5 + 32), unlike every other converter on this page.
Yes. It's completely free with no sign-up, and every conversion runs locally in your browser via JavaScript — the numbers you type are never sent to our servers.
Each unit uses its standard, internationally defined conversion factor, calculated in full precision and only rounded for display. Results are accurate to at least 6 significant figures.
This page intentionally covers the most commonly used temperature units rather than an exhaustive engineering list. Use the suggestion button in the bottom-right corner of any page to request a unit and we'll consider adding it.
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