Celsius (oven) to Gas Mark

Free instant celsius (oven) to gas mark converter. 1 °C = -8.648 GM.

-8.648
Formula
1 °C = -8.648 GM

Common Celsius (oven) to Gas Mark values

Common Celsius (oven) to Gas Mark conversion values.
Celsius (oven) (°C)Gas Mark (GM)
1-8.648
5-8.36
10-8
25-6.92
50-5.12
100-1.52
50027.28
100063.28

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How does Celsius (oven) to Gas Mark conversion work?

Type a value in the Celsius (oven) (°C) field and the equivalent in Gas Mark (GM) appears instantly to the right. The math uses the exact formula shown above — no rounding errors, no approximations beyond standard floating-point precision. Use the swap button to flip the units and see the inverse conversion.

Celsius (oven). Standard oven temperature in metric countries. Common settings: 160°C (low), 180°C (moderate), 200°C (hot), 220°C (very hot).

Gas Mark. UK gas-oven dial settings. Gas mark 1 ≈ 135°C (275°F); each step up adds about 14°C (25°F). Gas mark 4 (350°F) is standard for most baking.

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Conversion factors come from the official standard (NIST, BIPM, ISO definitions where applicable). Values are precise to standard floating-point limits.

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Frequently asked

What is the formula for converting Celsius (oven) to Gas Mark?+
The formula is: 1 °C = -8.648 GM. Type any value into the calculator above and the result appears instantly.
How do I convert Gas Mark back to Celsius (oven)?+
Click the swap button (⇄) above to go to the Gas Mark → Celsius (oven) converter, or use the inverse formula derived from the one shown.
How accurate is the conversion?+
Conversion factors used here are exact rational values from NIST SP 811 and the BIPM SI brochure (e.g. 1 ft = 0.3048 m exactly, 1 lb = 0.45359237 kg exactly). Trailing-digit differences vs hand calculation come only from binary floating-point representation, never from the conversion factor itself.
Where do these conversion factors come from?+
Length and mass factors come from the 1959 international yard-and-pound agreement; SI base units (metre, kilogram, second, kelvin) come from the 2019 BIPM redefinition; energy and pressure factors are NIST SP 811 reference values. Each editorial section above lists the specific source for that category.
Can I copy the conversion factor for use elsewhere?+
Yes. The factor in the formula above is the exact rational value used internally; copying it into Excel or another tool reproduces the result to floating-point precision.

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