Gas Mark to Celsius (oven)

Free instant gas mark to celsius (oven) converter. 1 GM = 135 °C.

=⇄
135
Formula
1 GM = 135 °C

Common Gas Mark to Celsius (oven) values

Common Gas Mark to Celsius (oven) conversion values.
Gas Mark (GM)Celsius (oven) (°C)
1135
5190.556
10260
25468.333
50815.556
1001510
5007065.56
100014010

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

Type a value in the Gas Mark (GM) field and the equivalent in Celsius (oven) (°C) 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.

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.

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

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🎯 Accurate conversions

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 Gas Mark to Celsius (oven)?+
The formula is: 1 GM = 135 °C. Type any value into the calculator above and the result appears instantly.
How do I convert Celsius (oven) back to Gas Mark?+
Click the swap button (⇄) above to go to the Celsius (oven) → Gas Mark 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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