OneFreePlace — Everything Useful. Free.
Utilities / Celsius to Fahrenheit Converter
OneFreePlace · Tool #113

Celsius to Fahrenheit, with temperature and temperature-change kept separate.

Convert °C, °F, Kelvin and Rankine exactly, paste units directly, check absolute-zero validity, and switch to temperature-difference mode when you mean “warmer by 10°C” rather than “a temperature of 10°C.”

✓ Exact °C ↔ °F formula✓ Kelvin & Rankine✓ Δ-temperature mode✓ Absolute-zero validation
Celsius to Fahrenheit Converter
Exact · scientific · local
Temperature converter

What are you converting?

Paste units directly too: 20°C, 68 F, 293.15 K, 527.67 °R, or decimal commas such as 36,5°C.
Display precisionExact math underneath
A useful fixed point −40 is the same numerical value on both Celsius and Fahrenheit scales: −40°C = −40°F.
Fahrenheit
Exact conversion
68
°F
20°C × 9/5 + 32 = 68°F
Formula used °F = (°C × 9/5) + 32
20°C on a −100°C to 150°C scale48%

Temperature-change calculator

This mini calculator always treats the number as a difference, not an absolute temperature. No +32 offset is used for °C ↔ °F changes.

Celsius change10 Δ°Csame interval as 10 K
Fahrenheit change18 Δ°F1.8× the Celsius interval
Kelvin change10 Ksame interval size as °C
Rankine change18 °Rsame interval size as °F

Batch converter

Paste one temperature per line. Typed units override the selected unit; bare numbers use the unit selected above.

Reference temperatures

Useful fixed or commonly referenced points. Water freezing/boiling rows assume ordinary pure-water reference conditions; boiling temperature changes with pressure.

Reference°C°FK°R
i
Important distinctionAbsolute temperature conversion and temperature-difference conversion use different formulas. For actual temperatures, °F = °C × 9/5 + 32. For temperature changes, Δ°F = Δ°C × 9/5 — there is no +32 offset.