Oven Temperature Converter Free Online
Convert oven temperatures between Celsius (°C), Fahrenheit (°F), and British Gas Mark instantly. Includes the standard gas mark chart used in UK and Commonwealth recipes.
Gas Mark Chart
Pro — bulk batch conversion, API access, history & favorites
API access · Priority queue · Team workspace
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How It Works
Pick Your System or Ingredient
Choose your home size system, ingredient, or input mode using the dropdowns and category buttons. Defaults are sensible so you can start typing immediately.
Enter or Pick a Value
Type a number, choose a size, or use the dual inputs (e.g. ft + in or min + sec). Conversion runs as you type — no Convert button.
See Every Equivalent
Below the main result, the All Conversions panel shows your value across every supported system or unit at once — perfect for international shopping or recipe scaling.
Oven Temperature Converter Features
Gas Mark Chart
Standard Gas Mark 1/4 to 9 table used in UK and Commonwealth recipes. Each gas mark is shown alongside its °C and °F equivalent.
C ↔ F Math
Exact F = C × 9/5 + 32 formula. No rounding errors for precise oven calibration.
Recipe Ready
Convert any UK recipe (Gas Mark) for a US oven (°F) or a metric oven (°C) in one step.
Live Highlighting
When you enter a temperature, the closest gas mark is highlighted in the chart so you can see the standard "round" oven setting.
Live Conversion
Result updates on every keystroke. Switch units instantly with the swap button.
100% Private
All math runs in your browser. Safe for any recipe data.
Free vs Pro
| Feature | Free | Pro |
|---|---|---|
| Full oven temperature conversion | ||
| Live conversion | ||
| All-systems result panel | ||
| Bulk CSV / Excel conversion | — | |
| REST API access | — | |
| Custom precision settings | — |
Frequently Asked Questions
Gas Mark is the dial setting on a British gas oven, ranging from 1/4 (very low, 110°C) to 9 (very hot, 240°C). Each step is roughly 25°F (≈14°C). It is used in UK, Irish, Australian, and South African cookbooks.
There is no exact formula — Gas Mark is a 12-step scale, so we find the closest match. Roughly: Gas Mark = (°C − 121) / 14, then round to the nearest standard value (1/4, 1/2, 1, 2, …, 9).
In US recipes, "moderate" oven = 350°F = 180°C = Gas Mark 4. "Hot" = 400°F = 200°C = Gas Mark 6. "Very hot" = 450°F+ = Gas Mark 8+.
Fan (convection) ovens cook faster — reduce the temperature by ~20°C / 35°F or shorten time by 20%. The recipe usually specifies "fan" or "no fan"; this converter shows the bare temperature.
Mostly not. North America uses °F. Continental Europe uses °C. Gas Mark survives in UK and Ireland because of decades of cookbooks and gas oven dials. Modern UK ovens often show all three.