Free · Temperature converters 🌡️

Kelvin Prefixes & Temperature Scale Table

Convert a kelvin reading, choose small or large kelvin prefixes, and compare seven other scales.

Calculator inputs

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Enter the known values in the units shown. Results update as you type.
Where results are editable, change one to solve backwards. Lock a value to hold it fixed.
Use the worked example to check the method. Reset restores the starting fields.

Inputs and results stay in this browser tab. Bookify does not upload or store the values you enter.

A reading of 273.15 K equals 0 °C, 32 °F and 491.67 °R. The prefixed-kelvin rows describe that same temperature in a different unit size.

°C = K − 273.15; °F = (9/5)K − 459.67; prefixed K = K ÷ prefix multiplier

Enter these known values and leave the other values blank.

These are temperature readings, not temperature differences. Offset terms apply to readings; a change of 1 °C instead equals a change of 1 K or 1.8 °F.
For this ordinary thermodynamic-temperature model, every reading must be at or above 0 K: −273.15 °C or −459.67 °F. Specialized negative-temperature statistical states are outside the model.
Historical scales use fixed conventional linear relationships. Delisle runs downward as Celsius rises. A conversion does not determine boiling or freezing conditions.
Each row has its own unit selector. Its initial scale is a starting choice; use the currently selected unit when entering or reading a value.
A millikelvin reading is one thousandth of a kelvin reading before applying the Celsius offset. Do not scale the Celsius offset itself. The offered prefix list runs from yocto to yotta in the extended row.

Use an interval converter for differences. For example, a 10 °C increase is an 18 °F increase, while a reading of 10 °C equals 50 °F.

This historical convention uses °De = 1.5 × (100 − °C), so its direction is reversed.

Bookify enforces the 0 K lower bound for every editable thermodynamic-temperature reading.