Temperature Converter
Convert Celsius, Fahrenheit, kelvin and Rankine. Distinguish actual temperatures from temperature changes, and compare all four scales in a table.
YOUR CALCULATION
Result
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Calculation steps
Work through one step at a time or reveal the complete calculation. The steps use your current inputs.
How to calculate
For an actual temperature, first convert to kelvin including the scale offset, then convert kelvin to the selected scale. For a difference, apply the scale factor only: an offset cancels when subtracting temperatures.
Temperature: K = °C + 273.15; °F = K × 9/5 − 459.67; °R = K × 9/5. Differences: Δ°F = Δ°C × 9/5; ΔK = Δ°C.
Worked example
An actual temperature of 20 °C is 68 °F, 293.15 K and 527.67 °R. A change of 20 °C is a change of 36 °F, 20 K or 36 °R; it is not 68 °F.
Assumptions and input details
Ordinary thermodynamic temperatures below absolute zero are rejected. Signed temperature differences are allowed. Kelvin uses K without a degree sign. Reference points describe scale coordinates, not a prediction of boiling temperature at your elevation. The conversion does not account for sensor uncertainty or calibrate a thermometer.
References: NIST: SI temperature · US National Weather Service: temperature scales
Using this calculator
Can I enter my own problem?
Yes. Replace the example values with your own inputs. The result, calculation steps, tables and applicable diagrams update from those inputs. Blank or invalid values clear the result; example values are never silently substituted for missing inputs.
Are the results exact?
Results use floating-point arithmetic and displayed rounding. Read the formula, assumptions and any stated data precision before interpreting the result.
Is my input uploaded?
The calculation runs in your browser. No account, file upload or external AI service is required. Inputs are not saved between page reloads.
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