Temperature Converter & Weather Calculators

Formulas

• °F = °C × 9/5 + 32 · °C = (°F − 32) × 5/9
• K = °C + 273.15 · °R = °F + 459.67
• Heat index: the US National Weather Service Rothfusz regression on temperature (°F) and relative humidity, with NWS adjustments; for mild conditions (< 80 °F) the simpler Steadman formula is used.
• Wind chill (°C, km/h): 13.12 + 0.6215T − 11.37V^0.16 + 0.3965TV^0.16, valid for T ≤ 10 °C and V > 4.8 km/h.
• Dew point (Magnus): γ = ln(RH/100) + 17.62T/(243.12 + T); Td = 243.12γ / (17.62 − γ).

What counts as a fever?

For adults, an oral temperature of 38.0 °C (100.4 °F) or above is generally considered a fever. This tool is for information only — always consult a doctor about symptoms.