# Temperature Converter

> Convert temperatures between Celsius, Fahrenheit, Kelvin, and Rankine instantly — all scales shown at once. Free online temperature converter for cooking, science, and weather.

Type a temperature on any scale and see the equivalent on all the others at the same time — Celsius, Fahrenheit, Kelvin, and Rankine. A from/to selector with a swap button handles the pair you need most (usually °C ↔ °F), and a reference table lists key points from absolute zero to boiling water.

- **Live tool:** https://www.toolnova.org/utilities/temp-converter
- **Category:** Calculators & Converters (https://www.toolnova.org/utilities)
- **Price:** Free
- **Requirements:** Runs in a modern web browser · No signup · No install

## What this tool does

- Celsius, Fahrenheit, Kelvin, and Rankine — all shown at once
- From/To selector with one-tap swap
- Click-to-copy on any scale
- Reference table of key temperature points
- Scientific-notation output for extreme values

## How to use Temperature Converter

1. **Pick the scale you have** — Choose Celsius, Fahrenheit, Kelvin, or Rankine as your source in the left selector.
2. **Enter the temperature** — Type the value. Every other scale updates instantly in the results grid.
3. **Read or copy the result** — Use the To selector for a specific target, swap the direction, or click any scale to copy it.

## Common use cases

- Adapting an oven temperature between °F and °C for a recipe
- Reading a fever or weather figure in the 'other' unit
- Converting lab temperatures to Kelvin for calculations
- Checking values against absolute zero
- Converting to Rankine for thermodynamics coursework

## About

### Celsius, Fahrenheit, and Kelvin without the mental math

Type a value on any scale and the other two update instantly — (°C × 9/5) + 32 for Fahrenheit, + 273.15 for Kelvin. It's built for the moments the formula slips your mind: adapting a European recipe to a US oven, reading a fever in the 'other' unit, or checking a lab value against absolute zero.

### Reference points worth memorising

0°C / 32°F is freezing, 100°C / 212°F is boiling, 37°C / 98.6°F is body temperature, and −40° is the single point where both scales read the same. The converter validates against absolute zero (−273.15°C), so physically impossible inputs are caught instead of silently converted.

## FAQ

### How do I convert Celsius to Fahrenheit?

Formula: (°C × 9/5) + 32 = °F. Examples: 0°C = 32°F (freezing), 100°C = 212°F (boiling), 37°C = 98.6°F (body temperature), 20°C = 68°F (room temperature).

### How do I convert Fahrenheit to Celsius?

Formula: (°F - 32) × 5/9 = °C. Examples: 32°F = 0°C, 98.6°F = 37°C, 68°F = 20°C, 212°F = 100°C.

### What temperature is 37°C in Fahrenheit?

37°C = 98.6°F — this is normal human body temperature. A fever is generally considered 38°C (100.4°F) or above.

### What is Kelvin and how does it relate to Celsius?

Kelvin is the scientific temperature scale where 0K = absolute zero (the coldest possible temperature). To convert Celsius to Kelvin, add 273.15. So 0°C = 273.15K, 100°C = 373.15K.

### What temperature should I bake a cake?

Most cakes bake at 350°F (175°C). For reference: 325°F = 163°C, 375°F = 191°C, 400°F = 204°C, 425°F = 218°C. Use this converter to adapt recipes between US (Fahrenheit) and European (Celsius) measurements.

### At what temperature are Celsius and Fahrenheit equal?

Celsius and Fahrenheit are equal at -40 degrees: -40°C = -40°F. This is the only temperature where both scales intersect. Below this point, Celsius values are higher than Fahrenheit; above it, Fahrenheit values are higher.

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