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Temperature Converter Examples
The Temperature Converter converts values between Celsius, Fahrenheit, Kelvin, and Rankine instantly. Below are practical examples with formulas, common reference points, and use cases for science, cooking, and everyday life.
Conversion Formulas
// Celsius ↔ Fahrenheit
F = (C × 9/5) + 32
C = (F − 32) × 5/9
// Celsius ↔ Kelvin
K = C + 273.15
C = K − 273.15
// Fahrenheit ↔ Kelvin
K = (F + 459.67) × 5/9
F = K × 9/5 − 459.67
// Fahrenheit ↔ Rankine
R = F + 459.67
F = R − 459.67
// Celsius ↔ Rankine
R = (C + 273.15) × 9/5
C = (R × 5/9) − 273.15
Common Reference Temperatures
Description | Celsius | Fahrenheit | Kelvin | Rankine
-----------------------------|----------|------------|----------|--------
Absolute zero | -273.15 | -459.67 | 0 | 0
Liquid nitrogen boiling | -195.79 | -320.42 | 77.36 | 139.25
Dry ice (CO₂ sublimation) | -78.5 | -109.3 | 194.65 | 350.37
Water freezing point | 0 | 32 | 273.15 | 491.67
Room temperature | 20–22 | 68–72 | 293–295 | 527–531
Body temperature (normal) | 37 | 98.6 | 310.15 | 558.27
Water boiling point (sea lvl)| 100 | 212 | 373.15 | 671.67
Oven: low heat | 150 | 302 | 423.15 | 761.67
Oven: medium heat | 180 | 356 | 453.15 | 815.67
Oven: high heat | 230 | 446 | 503.15 | 905.67
Celsius to Fahrenheit Examples
// Formula: F = (C × 9/5) + 32
-40°C → -40°F (the point where both scales are equal)
0°C → 32°F (water freezes)
10°C → 50°F (cool day)
20°C → 68°F (comfortable room temperature)
25°C → 77°F (warm day)
37°C → 98.6°F (human body temperature)
100°C → 212°F (water boils at sea level)
180°C → 356°F (moderate oven)
200°C → 392°F (hot oven)
Fahrenheit to Celsius Examples
// Formula: C = (F − 32) × 5/9
32°F → 0°C (water freezes)
50°F → 10°C (cool weather)
68°F → 20°C (room temperature)
72°F → 22.2°C (comfortable indoor temperature)
98.6°F → 37°C (body temperature)
104°F → 40°C (fever threshold)
212°F → 100°C (water boils)
350°F → 176.7°C (baking temperature)
425°F → 218.3°C (roasting temperature)
Celsius to Kelvin Examples
// Formula: K = C + 273.15
-273.15°C → 0 K (absolute zero)
-196°C → 77 K (liquid nitrogen)
0°C → 273.15 K (water freezes)
20°C → 293.15 K (room temperature)
100°C → 373.15 K (water boils)
5500°C → 5773 K (surface of the sun, approx.)
Kelvin to Celsius Examples
// Formula: C = K − 273.15
0 K → -273.15°C (absolute zero)
77 K → -196.15°C (liquid nitrogen boiling point)
273 K → -0.15°C (near freezing)
300 K → 26.85°C (warm room)
373 K → 99.85°C (near boiling)
1000 K → 726.85°C (very high temperature)
Rankine Examples (Engineering)
// Rankine = Fahrenheit + 459.67
// Used in US aerospace and chemical engineering
0 R → -459.67°F → -273.15°C (absolute zero)
491.67 R → 32°F → 0°C (water freezes)
671.67 R → 212°F → 100°C (water boils)
537 R → 77.33°F → 25.18°C (approx. room temperature)
Cooking Temperature Reference
Use Case | Celsius | Fahrenheit
--------------------------|---------|----------
Warm (bread proofing) | 30–35 | 86–95
Low oven (slow cook) | 120–150 | 248–302
Moderate oven (baking) | 160–180 | 320–356
Hot oven (roasting) | 200–220 | 392–428
Very hot (pizza, bread) | 230–260 | 446–500
Deep frying oil | 175–190 | 347–374
Candy: soft ball stage | 112–116 | 234–241
Candy: hard crack stage | 149–154 | 300–309
Weather Temperature Reference
Condition | Celsius | Fahrenheit
-------------------|---------|----------
Extreme cold | -30 | -22
Very cold | -15 | 5
Cold | -5 | 23
Cool | 10 | 50
Mild | 18 | 64
Warm | 25 | 77
Hot | 35 | 95
Extreme heat | 45 | 113
JavaScript Temperature Conversion Functions
const celsiusToFahrenheit = (c) => (c * 9/5) + 32;
const fahrenheitToCelsius = (f) => (f - 32) * 5/9;
const celsiusToKelvin = (c) => c + 273.15;
const kelvinToCelsius = (k) => k - 273.15;
const fahrenheitToKelvin = (f) => (f + 459.67) * 5/9;
const kelvinToFahrenheit = (k) => k * 9/5 - 459.67;
// Examples
console.log(celsiusToFahrenheit(100)); // 212
console.log(fahrenheitToCelsius(98.6)); // 37
console.log(celsiusToKelvin(0)); // 273.15
Quick Mental Conversion Tips
- Double the Celsius value and add 30 for a rough Fahrenheit estimate (e.g., 20°C → 70°F, actual 68°F)
- Subtract 30 from Fahrenheit and halve it for a rough Celsius estimate (e.g., 70°F → 20°C)
- Add 273 to Celsius for a quick Kelvin approximation
- -40 is the same in both Celsius and Fahrenheit
- 16°C ≈ 61°F (easy to remember: digits reversed)
- 28°C ≈ 82°F (easy to remember: digits reversed)
Enter any temperature value in the converter and instantly see all four scale equivalents with full precision.