Everyday Life

Convert Celsius ↔ Fahrenheit

Built by Kevin Glover · @gloverbuilds · Verified formula

Convert temperatures between Celsius and Fahrenheit instantly. Includes common reference points and formulas.

📅 Updated April 2026 ✅ Formula verified 📖 4 min read 🆓 Free · No sign-up

In this article

The Conversion Formulas
Quick Mental Math

The Conversion Formulas

Celsius to Fahrenheit: °F = °C × 9/5 + 32. Fahrenheit to Celsius: °C = (°F - 32) × 5/9. Key reference points: 0°C = 32°F (water freezes), 100°C = 212°F (water boils), 37°C = 98.6°F (body temperature), -40°C = -40°F (the only point where both scales are equal).

Quick Mental Math

For a rough conversion: C to F: double the Celsius and add 30. 20°C → 40+30 = 70°F (actual: 68°F, close enough). F to C: subtract 30, then halve. 80°F → 50/2 = 25°C (actual: 26.7°C). These approximations are within 2-3 degrees for everyday temperatures.

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Frequently asked questions

What is 37°C in Fahrenheit?▾

98.6°F — normal human body temperature. A fever is generally considered 100.4°F (38°C) or above.

What is the easiest way to convert?▾

Quick trick: double the Celsius and add 30 for an approximate Fahrenheit. For exact: multiply by 9/5 and add 32. Or just use this converter.

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Kevin Glover · @gloverbuilds

Founder, CalcWolf · GLVTS · Blickr

All formulas sourced from primary references — IRS publications, peer-reviewed research, and official standards. Results are tested against independent reference calculators before publishing. Rates and brackets updated when official sources change. Editorial policy →