Convert between Fahrenheit and Celsius instantly. Useful for weather, cooking, science, and everyday temperature comparisons.
Last updated: March 2026 | By Patchworkr Team
Fahrenheit and Celsius are two different temperature scales. Celsius is a relative scale based on water's freezing (0°C) and boiling (100°C) points. Fahrenheit is also relative, but uses different reference points.
The two scales differ in two ways:
Water freezes at 0°C = 32°F and boils at 100°C = 212°F.
In both scales, absolute zero (the lowest possible temperature) occurs at −273.15°C or −459.67°F.
First subtract 32 to undo the offset, then multiply by 5/9 to scale down.
Same result as formula #1 (since 5/9 ≈ 0.5556). Use whichever is more convenient.
Scale up by 9/5, then add 32 to shift to Fahrenheit baseline.
Roughly 10% off but works well for everyday weather temperatures.
Convert 86°F to Celsius (step-by-step)
Step 1: Subtract 32
Step 2: Multiply by 5/9 (or 0.5556)
They give identical results. Use whichever is more convenient. 0.5556 is simpler; 5/9 shows the underlying ratio.
Subtract 32, then multiply by 5/9 (or 0.5556).
Subtract 30 and divide by 2. This is roughly 10% off but works well for everyday weather temperatures.
-40°.
About 21°C — comfortable room temperature.
It was defined using older reference points before modern standards.
About 37.8°C.
Yes—especially when converting oven temps from US recipes.
Yes, almost everywhere outside the US.