ClueLuma

Temperature converter

Convert temperatures between Fahrenheit, Celsius, kelvin and Rankine, plus a separate converter for temperature differences (ΔT) used in heat-transfer formulas.

Temperature

68°F Fahrenheit
20°C Celsius
293.15K kelvin
527.67°R Rankine

Temperature difference (ΔT)

20Δ°F Fahrenheit degrees
11.1111Δ°C Celsius degrees
11.1111ΔK kelvins
20Δ°R Rankine degrees

Formula

∘C=(∘F−32)×59{}^{\circ}\mathrm{C} = \left({}^{\circ}\mathrm{F} - 32\right) \times \frac{5}{9} ∘F=∘C×95+32{}^{\circ}\mathrm{F} = {}^{\circ}\mathrm{C} \times \frac{9}{5} + 32 K=∘C+273.15\mathrm{K} = {}^{\circ}\mathrm{C} + 273.15 ∘R=∘F+459.67{}^{\circ}\mathrm{R} = {}^{\circ}\mathrm{F} + 459.67 ΔT∘C=ΔT∘F×59\Delta T_{{}^{\circ}\mathrm{C}} = \Delta T_{{}^{\circ}\mathrm{F}} \times \frac{5}{9}

Common values

°F°CK
-40-40233.15
0-17.78255.37
320273.15
404.44277.59
457.22280.37
5512.78285.93
6820293.15
7222.22295.37
7825.56298.71
8529.44302.59
9535308.15
14060333.15
18082.22355.37
212100373.15

Temperature differences convert without the 32° offset. A 20 °F difference is an 11.1 °C (11.1 K) difference, not −6.7 °C. Use the ΔT converter for values that go into formulas such as q = 1.08 × cfm × ΔT.

Absolute scales (kelvin and Rankine) start at absolute zero. Use them in ratios and in formulas with T⁴, such as radiation heat loss.

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Results are estimates for study and screening. Check the inputs, units and assumptions before you use them for design, billing or contract decisions.