Free Online Celsius to Fahrenheit
Celsius and Fahrenheit are linked by F = C × 9/5 + 32 (inverse C = (F − 32) × 5/9). Affine, not linear.
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How to Use This Converter
- Type a value into either the Celsius or Fahrenheit field.
- The other field updates immediately using the affine formula.
- Read the formula displayed under the inputs to verify the conversion.
What Is a Celsius to Fahrenheit?
Temperature is the textbook example of an affine conversion: the scales have different step sizes (9 F per 5 C) and different zero points (0 C lines up with 32 F). Skip the offset and a 20 C oven becomes a freezing 36 F instead of a warm 68 F.
The everyday anchors are worth memorising: water freezes at 0 C / 32 F, boils at 100 C / 212 F, the two scales meet at -40 C / -40 F, and normal body temperature is 37 C / 98.6 F. US oven recipes at 350 F bake at 177 C; a 20 C room is a comfortable 68 F.
This page handles the single most common temperature pair. For Kelvin and Rankine, use the full temperature tool.
Frequently Asked Questions
What is 100°C in Fahrenheit?
Formula for C to F?
What is body temperature?
Published by the WeGotEveryTool team. We build and test every tool in-house and update pages when the underlying spec, formula, or recommendation changes.
Reviewed: May 2026. Disclaimer: this tool is provided as-is for general informational use. For decisions with material consequences (medical, legal, financial, security) verify results against a qualified professional source.
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