Temperature Converter
Process, laboratory and climate specifications each favour a different temperature scale, and a wrong sign or offset in a conversion is the kind of error that ruins a calibration. This converter moves exactly between Celsius, Fahrenheit and Kelvin and shows the formula it used.
Convert temperature units
Result
The three scales in practice
Celsius is the engineering and meteorological default; Fahrenheit remains standard in US imperial specifications; Kelvin is the thermodynamic scale used in gas-law, enthalpy and low-temperature work. Converting is exact and linear except for the offset, which is where mistakes happen.
Always carry the unit with the number. A setpoint of 25 means nothing without its scale, and 25 °C is 77 °F — a difference large enough to matter for a biological or chemical process.
Where the offset matters
The Celsius–Fahrenheit relation is °F = °C × 9/5 + 32, not a simple ratio, so interpolation by eye is unsafe near freezing. Kelvin shares Celsius degrees but starts at absolute zero (0 K = −273.15 °C), so it is never negative and is the correct scale for any calculation involving absolute temperature.
Complete conversion reference
| Convert 1 unit to | °C | °F | K |
|---|---|---|---|
| 1 °C | 1 | 33.8 | 274.15 |
| 1 °F | -17.2222 | 1 | 255.928 |
| 1 K | -272.15 | -457.87 | 1 |
Instruments for this measurement
Models shown are representative families, not a complete catalogue. Send us your application, water analysis and installation constraints and we will match instruments to it.
Frequently asked
What is the formula from Celsius to Fahrenheit?
How do I convert Celsius to Kelvin?
Is 0 °C the same as 0 °F?
Why do labs quote both °C and K?
This page performs exact unit arithmetic with no physical assumption beyond the stated reference (for example mH₂O assumes water near 4 °C, and pH follows its logarithmic definition). It is a working aid, not a substitute for the measurement method named in your permit.