How the conversion works
(68 − 32) × 5/9 = 20°C. The quick answer is rounded for readability; use the live calculator below for another value or more precision.
68°F to °C: 68 Fahrenheit Equals 20°C
68°F equals exactly 20°C. See the Fahrenheit-to-Celsius formula, check the substituted working, and convert another temperature.
Quick reference
20°C
68°F → Celsius
When this is useful
Temperature conversions are useful for weather, cooking, laboratory readings, equipment specifications and international documentation.
Quick comparison table
Compare the current answer with nearby or reverse values from the same converter family. Open any row to keep the units preselected and change the number.
68°F: the reference room temperature
68°F is exactly 20°C. ISO 1 fixes 20°C as the standard reference temperature for measuring engineering parts, so drawings and gauge specifications written in US units often quote 68°F.
| Setting | °F | °C |
|---|---|---|
| This page | 68°F | 20°C |
| One Fahrenheit degree warmer | 69°F | 20.56°C |
| Two Celsius degrees cooler | 64.4°F | 18°C |
| Warm room | 77°F | 25°C |
- 68°F lands on a whole Celsius number because 68 − 32 = 36 and 36 × 5/9 = 20. Every 9°F step from 32°F adds a whole 5°C.
- A thermostat that moves in whole Fahrenheit degrees changes the room by 0.56°C per click.
- Parts measured warmer than 20°C have expanded slightly, which is why precision measurements are taken at, or corrected to, this temperature.
- Density and viscosity tables are often given at 20°C, so a US data sheet that quotes 68°F describes the same condition.
"Subtract 30 and halve" gives 19°C, only one degree under the exact 20°C, so the rough method works well at room temperature.
Convert another value
20 °C
68 °F
A quick note before you use the number
Celsius and Fahrenheit use an offset as well as a scale factor, so temperature conversion is not a simple multiplication. Kelvin is handled with the standard absolute-temperature formula.
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