Temperature Converter Calculator

Work out temperature converter instantly with clear inputs, formula shown and shareable results.

About Temperature Converter Calculator

Temperature scales differ in both their zero point and their step size, so converting needs an offset as well as a factor. This converter routes through kelvin — the absolute scale — which removes the offset problem: the input is converted to kelvin first, then out to the target scale. Kelvin and Rankine share absolute zero; Celsius and Fahrenheit do not, which is why 0 °C is 273.15 K.

Formulas

Celsius → Kelvin

K = °C + 273.15

Fahrenheit → Kelvin

K = (°F − 32) ÷ 1.8 + 273.15

Kelvin → Rankine

°R = K × 1.8

Worked example

With the default values below, Temperature Converter Calculator returns Converted Temperature of 77.00. Change any input above and every figure here is recalculated in your browser.

Inputs used

Temperature: 25
From scaleone of Celsius (°C), Fahrenheit (°F), Kelvin (K), Rankine (°R): Celsius (°C)
To scaleone of Celsius (°C), Fahrenheit (°F), Kelvin (K), Rankine (°R): Fahrenheit (°F)

Results

Converted Temperature: 77.00
Result Scale: Fahrenheit (°F)
Absolute Temperature (K): 298.15
Physically Possible: Yes

Step by step

1Values used
2Celsius → Kelvin
3Fahrenheit → Kelvin
4Kelvin → Rankine
5Converted Temperature= 77.00
6Result Scale= Fahrenheit (°F)
7Absolute Temperature (K)= 298.15
8Physically Possible= Yes

Assumptions and limits

The result is derived only from the 3 inputs listed above. Anything not among them is not part of the calculation.
In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
Figures are rounded for display to 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

Why can't temperature use a single multiplier?

Because the scales start at different zero points. Length has a shared zero, so 1 m is always 3.28 ft. Temperature needs the offset applied before the scaling, which is why °C to °F is ×1.8 then +32, not just ×1.8.

What happens below absolute zero?

Nothing physical. 0 K (−273.15 °C, −459.67 °F) is the floor, so the calculator flags any input that converts to a negative kelvin value as impossible.