Temperature Unit Converter – °C, °F, K, °R

Temperature Unit Converter

Convert temperature between Celsius (°C), Fahrenheit (°F), Kelvin (K), and Rankine (°R) with 100% accuracy using standard engineering formulas.

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Conversion Formulas

From \ To	Celsius (°C)	Fahrenheit (°F)	Kelvin (K)	Rankine (°R)
°C	—	$T_F = T_C \times 1.8 + 32$	$T_K = T_C + 273.15$	$T_R = (T_C + 273.15) \times 1.8$
°F	$T_C = (T_F - 32) \div 1.8$	—	$T_K = (T_F + 459.67) \div 1.8$	$T_R = T_F + 459.67$
K	$T_C = T_K - 273.15$	$T_F = T_K \times 1.8 - 459.67$	—	$T_R = T_K \times 1.8$
°R	$T_C = (T_R \div 1.8) - 273.15$	$T_F = T_R - 459.67$	$T_K = T_R \div 1.8$	—

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Engineering Use Cases

1. Heat Exchanger Design
   Inlet: 25 °C → Outlet: 80 °C
   → $\Delta T = 55 \, ^\circ \text{C} = 99 \, ^\circ \text{F}$

2. Steam Tables
   Saturated steam at 120 °C = 393.15 K

3. Cryogenic Systems
   LN₂ at –196 °C = 77 K = –320.8 °F

4. Boiler Feedwater
   150 °C = 302 °F = 423.15 K

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Quick Reference Table

°C	°F	K	°R
0	32	273.15	491.67
20	68	293.15	527.67
100	212	373.15	671.67
250	482	523.15	941.67

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Pro Tip: Always use Kelvin for thermodynamic calculations (e.g., ideal gas law, entropy).