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Celsius to Fahrenheit Converter
↔ Convert °F to °C instead

Common Conversions

°C °F
-273.15 -459.67
-196 -320.8
-78 -108.4
-40 -40
0 32
20 68
25 77
37 98.6
78 172.4
100 212
200 392
500 932
1000 1832

Why this conversion matters in chemistry

Most chemistry lives in Celsius — or Kelvin when things get thermodynamic — but Fahrenheit still turns up on US-sourced equipment and safety sheets. An ethanol flash point quoted as 55°F is 13°C once you run it through the formula, which is what places the solvent in NFPA Class IB. US-built ovens, chillers, and incubators often read in Fahrenheit too, so matching a 65°C protocol set point to a Fahrenheit dial takes the same quick arithmetic. The conversion is linear with an offset — multiply by 9/5 and add 32 — but the offset is what trips people up, because it means a 10°C shift isn't a 10°F shift.

Formula

°F = (°C × 9/5) + 32

Worked Examples

100°C = 212°F

The boiling point of water at 1 atm. The easiest anchor in the whole scale.

0°C = 32°F

Water's freezing point. The other anchor — the 32°F offset is where every headache with this conversion originally comes from.

37°C = 98.6°F

Body temperature. Worth knowing cold because it comes up in almost any mammalian cell or enzyme assay.

25°C = 77°F

Standard room-temperature reference for thermodynamic tables. Most ΔH and ΔG values you'll see reported are at this temperature.

Frequently Asked Questions

What's the formula?
Multiply Celsius by 9/5 (or 1.8), then add 32. So 25°C becomes 25 × 1.8 + 32 = 77°F. The multiplication handles the scale difference, the +32 handles the offset between where the two scales put zero.
Is there a temperature that reads the same in both scales?
Yes — minus 40. –40°C = –40°F exactly. It's the one point where the two scales cross, which is the kind of fact that tends to stick once you've seen it. Useful as a sanity check for a conversion calculation gone wrong.
Why do chemists bother converting at all?
Most of the chemistry literature, and all standard thermodynamic tables, use Celsius or Kelvin. Older US industrial references, HVAC specs, and a fair amount of lab equipment still ship with Fahrenheit dials, though. Being fluent both directions means you can reproduce a published protocol on whatever equipment you happen to have.
What is standard temperature for chemistry in Fahrenheit?
25°C (298.15 K) — the reference for most tabulated thermodynamic data — is 77°F. STP for gas-law calculations uses 0°C (273.15 K) instead, which is 32°F. Two different conventions for two different purposes; worth keeping straight.