Room temperature
20 °C equals 68 °F and 293.15 K. Absolute conversions include an offset between the scales.
Temperature Converter
Absolute values cannot be below 0 K (−273.15 °C or −459.67 °F). Difference mode ignores offsets and accepts signed changes.
Converted value
Fahrenheit (°F)
Fahrenheit (°F)
Display rounding does not change the calculation. Scientific notation keeps very small values visible; extra digits do not add measurement accuracy.
| Unit | Equivalent |
|---|---|
| Celsius (°C) | 20 |
| Fahrenheit (°F) | 68 |
| Kelvin (K) | 293.15 |
| Rankine (°R) | 527.67 |
Temperature change between two readings
Enter two absolute readings on one scale. A negative result means cooling. Both readings must be at or above absolute zero.
60Temperature change (K / °C difference)
108Fahrenheit change (°F difference)
353.15Final absolute temperature (K)
All entered measurements and calculations stay in this browser. No external API or uploaded dataset is used.
How to use the Temperature Converter
- 01
Enter a numeric value without a comma separator or unit suffix, then choose the source and destination units.
- 02
Read the main result and equivalent-unit table. Choose 3, 6, 9, or 12 significant digits for display; calculation constants are not rounded to match the display.
- 03
Use the temperature change between two readings panel for the practical calculation. Restore its example independently from the converter.
- 04
Copy the conversion or task results, or download the displayed conversion table as a CSV. Clear removes the converter value.
Examples
A change, not a reading
A temperature rise of 10 °C is a rise of 18 °F. Turn on temperature difference mode; converting an absolute reading of 10 °C instead gives 50 °F.
Offsets and scale sizes
For an absolute Celsius reading, Fahrenheit = Celsius × 9/5 + 32, and kelvin = Celsius + 273.15. A Rankine degree has the same size as a Fahrenheit degree, but its zero is absolute zero. Kelvin is written K, without a degree symbol.
Absolute zero and intervals
The tool rejects absolute readings below 0 K, −273.15 °C, −459.67 °F, or 0 °R. An interval can be negative because it represents a decrease. Celsius and kelvin intervals have the same numerical size, while Fahrenheit and Rankine intervals multiply them by 9/5.
Precision and accepted input
Use a decimal point or scientific notation such as 1e3. Blank values, unit suffixes, separators, and nonfinite numbers are rejected. Input magnitudes above 1e100 or nonzero magnitudes below 1e-100 are outside the supported range. The table rounds only for presentation, so 12 displayed digits should not be interpreted as 12 digits of measurement accuracy. Binary floating-point calculations can differ from exact decimal arithmetic in the final digits.
What to know
- Uses ordinary nonnegative absolute thermodynamic temperatures; specialized negative-temperature systems are outside scope.
- Floating-point arithmetic can introduce tiny rounding differences near scale boundaries.
Common questions
Why does 0 °C not become 0 °F?
The scales have different zero points. Celsius zero corresponds to 32 °F. Only an interval of zero is zero on both scales.
Does this adjust for oven type or weather?
No. It converts temperature scales only. It does not estimate fan-oven adjustments, heat index, wind chill, or equipment calibration.