An oven-temperature converter switches between Fahrenheit (°F), Celsius (°C), and the British gas mark scale. The Toolenza calculator handles all three directions. Why all three matter: old British / Australian recipes use gas marks, US recipes use °F, and most of the world uses °C.

The reference table

Conversion formulas

• °F → °C — subtract 32, multiply by 5/9.
• °C → °F — multiply by 9/5, add 32.
• Gas mark → °F — gas mark × 25 + 275.

Convection vs conventional

Convection ovens cook ~20–25 °F (10–15 °C) hotter than the temperature gauge reads because the moving air transfers heat more efficiently. Most modern recipes assume conventional; if your oven is convection, drop the temperature 25 °F or shorten the time by 25%. New convection ovens often have an "auto-convert" mode that does this internally.

Pitfalls

• Oven thermometer disagreement. Most home ovens drift 25 °F from the set value. A cheap oven thermometer hanging on the rack is the single highest-ROI cooking investment.
• Gas-mark recipes from before 1970. Some pre-decimalisation UK recipes use Imperial fluid ounces (28.4 mL) instead of US (29.6 mL). Volume conversions matter as much as temperature.
• Don't open the door before time. Each peek drops the interior temp 50 °F and adds 2–5 minutes to the bake.