What does the Temperature Converter do?

Convert between Celsius, Fahrenheit and Kelvin instantly. Includes common temperature reference points and conversion formulas. All calculations are performed in your browser using official UK rates and thresholds.

Is this calculator free to use?

Yes. All calculators on Calks.uk are completely free to use. No account or registration is required. All calculations run in your browser — no data is collected.

Can I use this on my phone?

Yes. All our calculators are fully responsive and work on smartphones, tablets and desktop computers. The interface adapts to your screen size automatically.

Temperature Converter

Convert between Celsius, Fahrenheit and Kelvin instantly. Includes common temperature reference points and conversion formulas.

Last updated: April 2026 · Source: Met Office — Temperature explained

Temperature

From

Celsius

20.00°C

Fahrenheit

68.00°F

Kelvin

293.15 K

Disclaimer

This calculator is provided for informational purposes only and should not be considered as financial or tax advice. All calculations are performed locally in your browser — no personal data is collected or sent to our servers. Rates and thresholds are sourced from HMRC and GOV.UK and are updated for the current tax year. Always verify results with HMRC or consult a qualified professional before making financial decisions.

How It Works

The UK officially uses Celsius for temperature measurement, but Fahrenheit is still commonly understood, especially among older generations and in weather discussions. This converter handles Celsius, Fahrenheit and Kelvin conversions in both directions.

Key reference points: water freezes at 0°C (32°F) and boils at 100°C (212°F). Normal body temperature is approximately 37°C (98.6°F). The NHS considers a fever to be 38°C or above. Oven temperatures are often given in Celsius with a gas mark equivalent in UK recipes.

Example: Common temperature conversions

20°C = 68°F (comfortable room temperature)
37°C = 98.6°F (body temperature)
180°C = 356°F / Gas Mark 4 (moderate oven)
−40°C = −40°F (the point where both scales meet)

Source: Met Office — Temperature explained

Frequently Asked Questions

What does the Temperature Converter do?: Convert between Celsius, Fahrenheit and Kelvin instantly. Includes common temperature reference points and conversion formulas. All calculations are performed in your browser using official UK rates and thresholds.
Is this calculator free to use?: Yes. All calculators on Calks.uk are completely free to use. No account or registration is required. All calculations run in your browser — no data is collected.
Can I use this on my phone?: Yes. All our calculators are fully responsive and work on smartphones, tablets and desktop computers. The interface adapts to your screen size automatically.