Temperature Converter

Why temperature deserves its own tool

Temperature is the one conversion family where a simple multiplier fails: the scales have different zero points, so C↔F needs an offset and Kelvin needs no offset at all. That is why 25°C is 77°F, not 45 — and why this page rejects anything below absolute zero (−273.15 °C), the number no scale reaches whatever the screen says.

Use it for three everyday jobs: reading a foreign recipe (oven temperatures swap almost weekly between °C and °F), understanding weather abroad, and checking health thermometer readings against confident reference points. It is not a substitute for a food thermometer's own display accuracy, and nobody should trust a single °C↔°F figure blindly for lab work — but for cooking and weather it is the reliable everyday rule.

A worked example, step by step

Problem: a baking recipe says 210°C, but your oven dial is marked in Fahrenheit.

1. Multiply by 9/5: 210 × 1.8 = 378.
2. Add the offset: 378 + 32 = 410 °F.
3. If yours is a fan oven, many books suggest dropping about 20 °C (say 190°C ≈ 375 °F) — the dial marking matters more than theory.
4. Sanity-check the direction: 100 °C boiling water famously corresponds to 212 °F, which is "much higher in F" — consistent with 210 being well above 300 in F.

Both directions live on this page, so the return trip 410 °F → 210 °C works without separate arithmetic.

Reference points worth memorising

Two anchors carry most everyday use: freezing and body temperature. Everything else interpolates between them.

Mistakes that cook or forecast badly

• Multiplying without the offset. The 9/5 factor alone turns 25°C into 45 "F" and misreads every weather report.
• Offsetting Kelvin. K→°C is a plain subtraction of 273.15; no multiplication is ever involved.
• Ignoring fan-oven assumptions. Fan (convection) cooking runs hotter per dial degree; recipes specify which mode they expect.
• Double-converting. C→K→F chains inherit rounding each time; choose the direct pair from the start.
• Treating 98.6 °F as a hard constant. Population studies find average body temperature closer to 36.5–37.0 °C; a single number is a custom, not a law.

Keep exploring

• Length Converter and Weight Converter — the same unit-family thinking next door.
• Volume Converter — recipe quantities in ml and cups.
• Guide: Unit Conversion Mistakes to Avoid.