About the Temperature Converter
Temperature is one of the most fundamental physical quantities, and different scales are used across science, engineering, and everyday life. Our temperature converter lets you switch between Celsius (used worldwide), Fahrenheit (common in the US), Kelvin (the SI base unit for thermodynamic temperature), and Rankine (used in some engineering contexts) — all in real time.
How the formulas work
Each conversion uses a well-known formula. For example, °F = °C × 9/5 + 32 and K = °C + 273.15. The converter first normalises your input to Celsius, then derives every other scale from that base. The formula used for your selected conversion is displayed alongside the result so you can verify or learn the maths.
Common conversions
Water freezes at 0 °C / 32 °F / 273.15 K and boils at 100 °C / 212 °F / 373.15 K. Absolute zero — the lowest theoretically possible temperature — is −273.15 °C / 0 K / 0 °R. All calculations run entirely in your browser with no data sent to any server.