Quick reference
- 0 °C = 32 °F (water freezing)
- 20 °C = 68 °F (room temperature)
- 37 °C = 98.6 °F (body temperature)
- 100 °C = 212 °F (water boiling at 1 atm)
- −40 °C = −40 °F (the only point where they meet)
FAQ
Quick mental shortcut?
Double C and add 30 — gives F within ~3°. So 20 °C → 70 (actual 68), 30 °C → 90 (actual 86). Good for ballpark estimates.