Temperature Difference Calculator – ΔT in °C, °F, K
Convert a temperature change, not an absolute reading
Required Parameters
Waiting for input data...
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Quick Answer
Δ = final − initial. Then 1°C difference = 1 K difference = 1.8°F difference. 20°C to 30°C is +10°C / +18°F / +10 K, not 86°F.
Temperature Difference Calculator
This tool converts a span, not a thermometer reading.
1°C difference = 1 K difference = 1.8°F difference
A PCB that rises from 25°C to 85°C has ΔT = 60°C = 108°F = 60 K. Putting 85°C into an absolute converter and calling the result “the rise” is wrong.
Related
- Absolute readings: Temperature Converter
- Junction Temperature Calculator uses ΔT = P × RθJA
- PCB Trace Width Calculator uses a temperature-rise input
Design Notes
Absolute conversion adds the 32 / 273.15 offset. Difference conversion does not. Use this tool for temperature rise, thermal cycling span, and ΔT in heat-transfer equations.
Common Mistakes
- 1
Putting 10°C into an absolute converter and reading 50°F as the rise. The rise is 18°F.
- 2
Treating Kelvin and Celsius differences as different sizes. They are the same size.
Knowledge Base
How do I convert a temperature difference?
Do not add 32 or 273.15. Multiply the Celsius (or kelvin) span by 1.8 to get the Fahrenheit span.
Can ΔT be negative?
Yes. If the final temperature is lower than the initial temperature, the difference is negative (a drop).