Aisha K.
Mar 12, 2026
Clean layout and the results update instantly. Exactly what I needed for a quick planning check.
Unit Converters
Gas Mark to Fahrenheit Converter
°F ≈ 250 + 25 × gas mark. Mark 1 = 275 °F; Mark 4 = 350 °F; Mark 9 = 475 °F.
UK recipes say Gas Mark 4 and a US oven only has a knob in °F. Mark 1 is 275 °F, then about +25 °F per mark. Mark 4 is 350 °F — the everyday cake setting. This is British gas-oven tradition, not a lab scale.
Gas mark
GM → °F
350 °F
Gas Mark 4 → 350 °F (177 °C). Mark 6 → 400 °F. Mark 9 → 475 °F.
- You typed
- 4 GM
- How it’s calculated
- °F ≈ 250 + 25 × gas mark. Mark 1 = 275 °F; Mark 4 = 350 °F; Mark 9 = 475 °F.
Plain-English guide
Terms & how it works
Confused by a field? Read the short definitions here while you use the tool.
Gas mark
The “Gas mark” value used in this tool’s formula. Adjust it to see results update live.
How this calculator works
UK recipes say Gas Mark 4 and a US oven only has a knob in °F. Mark 1 is 275 °F, then about +25 °F per mark. Mark 4 is 350 °F — the everyday cake setting. This is British gas-oven tradition, not a lab scale. °F ≈ 250 + 25 × gas mark. Mark 1 = 275 °F; Mark 4 = 350 °F; Mark 9 = 475 °F. Example: Gas Mark 4 → 350 °F (177 °C). Mark 6 → 400 °F. Mark 9 → 475 °F.
°F ≈ 250 + 25 × gas mark. Mark 1 = 275 °F; Mark 4 = 350 °F; Mark 9 = 475 °F.
Example: Gas Mark 4 → 350 °F (177 °C). Mark 6 → 400 °F. Mark 9 → 475 °F.
When to use this Gas Mark to Fahrenheit
Common use cases
- UK recipes say Gas Mark 4 and a US oven only has a knob in °F. Mark 1 is 275 °F, then about +25 °F per mark. Mark 4 is 350 °F — the everyday cake setting. This is British gas-oven tradition, not a lab scale.
- Sanity-check with this case: Gas Mark 4 → 350 °F (177 °C). Mark 6 → 400 °F. Mark 9 → 475 °F.
- The relationship is: °F ≈ 250 + 25 × gas mark. Mark 1 = 275 °F; Mark 4 = 350 °F; Mark 9 = 475 °F.
Localized examples
- Unit Converters: the example on this page uses the same formula as the widget.
What you get
- Fields: Gas mark
- °F ≈ 250 + 25 × gas mark. Mark 1 = 275 °F; Mark 4 = 350 °F; Mark 9 = 475 °F.
- Example on the page: Gas Mark 4 → 350 °F (177 °C). Mark 6 → 400 °F. Mark 9 → 475 °F.
How to Convert Gas Mark to Fahrenheit Step-by-Step
- 1Enter Gas mark. Use the values you have, not a catalog average, unless that is all you know.
- 2°F ≈ 250 + 25 × gas mark. Mark 1 = 275 °F; Mark 4 = 350 °F; Mark 9 = 475 °F.
- 3Worked case: Gas Mark 4 → 350 °F (177 °C). Mark 6 → 400 °F. Mark 9 → 475 °F.
- 4Check which dictionary the other person is using — US or UK, decimal or 1,024 — then trust the number.
Governing formula
°F ≈ 250 + 25 × gas mark. Mark 1 = 275 °F; Mark 4 = 350 °F; Mark 9 = 475 °F.
Gas Mark 4 → 350 °F (177 °C). Mark 6 → 400 °F. Mark 9 → 475 °F.
Example: set Gas mark = 4, then read the result.
Variable definitions
- value
Gas mark
The “Gas mark” field. Default 4; typical range 0.25–10.
- The conversion (°F ≈ 250 + 25 × gas mark. Mark 1 = 275 °F; Mark 4 = 350 °F; Mark 9 = 475 °F.) does not pick US vs UK gallons, SI vs binary megabytes, or Mach at altitude for you. Read the footnote on the page.
- Nothing here is uploaded for the calculation itself.
Frequently Asked Questions
Fan settings run cooler. Convert the mark, then drop 15–20 °C if the recipe assumed a still oven.
Related calculators
Unit Converters
- Fahrenheit to Gas MarkAn American 350 °F cake is UK Gas Mark 4. The mark scale jumps about 25 °F per number. Round to the nearest mark your knobs actually have. Pizza steel at 500 °F is past Mark 9 — just use the number.
- Fahrenheit to KelvinWhen a US weather number has to enter an ideal-gas problem: convert °F to °C in your head, then add 273.15 — or let this page do both. 68 °F is 293.15 K.
- Gas Mark to CelsiusUK Gas Mark 4 is 180 °C (350 °F), the everyday sponge setting. Mark 6 is 200 °C. Fan ovens usually want 15–20 °C less than a still oven. The thermostat in the door is not a lab probe.
- Celsius Heat Units to JoulesA Celsius heat unit is the heat to raise 1 pound of water by 1 °C — about 1,899 J. Old HVAC and process papers use CHU. If you expected BTU, you are on the Fahrenheit twin (1 lb × 1 °F). Do not mix them in a load calc.
- Celsius to FahrenheitWeather apps, ovens, and fever debates. Multiply °C by 9/5 and add 32. Room temperature 20 °C is 68 °F. Body temperature 37 °C is 98.6 °F. The “times two plus 30” trick is only for sidewalks.
- Celsius to KelvinLabs and gas laws want kelvin because zero means zero motion, not “really cold in Celsius.” Add 273.15. You never write a degree sign on K. 25 °C room temp is 298.15 K.
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4.8
out of 5.0
4 reviews
Daniel R.
Feb 28, 2026
Very usable on mobile. Would love a save/export option later, but the math feels solid.
Priya S.
Feb 3, 2026
The FAQ section answered my questions before I even had to search. Smooth dark mode too.
Marcus L.
Jan 19, 2026
Simple inputs, clear outputs. This replaced three bookmarks I used to juggle.
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