{"success":true,"version":"v1","request":{"tool":"get_calculator_schema","calculator_id":"oven-temperature"},"result":{"entity_type":"calculator","id":"oven-temperature","calculator_id":"oven-temperature","canonical_url":"https://tttkmbb.com/food/oven-temperature","name":"Oven Temperature Converter","title":"Oven Temperature Converter – Celsius, Fahrenheit, Gas Mark and Fan Oven Settings","category":"food","category_name":"Food & Cooking","tool_name":"convert_oven_temperature","featured_mcp_tool":false,"description":"Converts an oven setting between degrees Celsius, degrees Fahrenheit and British gas marks, reports the descriptive term (slow, moderate, hot) and the equivalent fan (convection) oven setting, which is 20 °C lower.","use_when":"A recipe gives an oven temperature in a scale your oven does not use, mentions a gas mark, or you need the fan-oven equivalent of a conventional temperature.","do_not_use_when":"You need a general temperature conversion that is not an oven setting (use temperature), or internal food doneness temperatures (use turkey-cooking-time for poultry).","inputs":[{"name":"temperature","label":"Oven setting","type":"number","required":true,"min":0,"max":600,"description":"Oven temperature in temperature_unit, or the gas mark number (0.25, 0.5, 1 … 10).","example":180},{"name":"temperature_unit","label":"Scale","type":"enum","required":false,"default":"c","values":[{"value":"c","label":"Celsius (°C)","aliases":["celsius","°c","degc"]},{"value":"f","label":"Fahrenheit (°F)","aliases":["fahrenheit","°f","degf"]},{"value":"gas_mark","label":"Gas mark","aliases":["gas","gas mark","gm","mark"]}],"description":"Scale of the input value.","example":"c"},{"name":"input_is_fan_oven","label":"Input is a fan-oven setting","type":"boolean","required":false,"default":false,"description":"true if the given temperature is already a fan/convection setting; it is then raised by 20 °C to the conventional equivalent before conversion.","example":false}],"outputs":[{"name":"celsius","label":"Conventional oven","type":"number","unit":"°C","decimals":0,"description":"Conventional (static) oven temperature in Celsius."},{"name":"fahrenheit","label":"Conventional oven","type":"number","unit":"°F","decimals":0,"description":"Conventional oven temperature in Fahrenheit."},{"name":"gas_mark","label":"Gas mark","type":"string","decimals":4,"description":"Nearest British gas mark (¼, ½, 1–10)."},{"name":"gas_mark_exact","label":"Gas mark (exact)","type":"number","decimals":2,"description":"Unrounded gas mark position, (°F − 250) / 25 for gas mark 1 and above."},{"name":"fan_oven_c","label":"Fan / convection oven","type":"number","unit":"°C","decimals":0,"description":"Conventional temperature minus 20 °C."},{"name":"fan_oven_f","label":"Fan / convection oven","type":"number","unit":"°F","decimals":0,"description":"Conventional Fahrenheit temperature minus 25 °F (US convection rule)."},{"name":"description","label":"Oven description","type":"string","decimals":4,"description":"Traditional term for this heat: very slow, slow, moderately slow, moderate, moderately hot, hot, very hot."},{"name":"conversion_table","label":"Gas mark table","type":"list","decimals":0,"description":"Gas marks ¼–10 with °F, °C and fan °C."}],"input_schema":{"type":"object","properties":{"temperature":{"description":"Oven temperature in temperature_unit, or the gas mark number (0.25, 0.5, 1 … 10).","type":"number","minimum":0,"maximum":600,"examples":[180]},"temperature_unit":{"description":"Scale of the input value.","type":"string","enum":["c","f","gas_mark"],"default":"c","examples":["c"]},"input_is_fan_oven":{"description":"true if the given temperature is already a fan/convection setting; it is then raised by 20 °C to the conventional equivalent before conversion.","type":"boolean","default":false,"examples":[false]}},"additionalProperties":false,"required":["temperature"]},"output_schema":{"type":"object","properties":{"celsius":{"description":"Conventional (static) oven temperature in Celsius. Unit: °C.","type":"number","x-unit":"°C"},"fahrenheit":{"description":"Conventional oven temperature in Fahrenheit. Unit: °F.","type":"number","x-unit":"°F"},"gas_mark":{"description":"Nearest British gas mark (¼, ½, 1–10).","type":"string"},"gas_mark_exact":{"description":"Unrounded gas mark position, (°F − 250) / 25 for gas mark 1 and above.","type":"number"},"fan_oven_c":{"description":"Conventional temperature minus 20 °C. Unit: °C.","type":"number","x-unit":"°C"},"fan_oven_f":{"description":"Conventional Fahrenheit temperature minus 25 °F (US convection rule). Unit: °F.","type":"number","x-unit":"°F"},"description":{"description":"Traditional term for this heat: very slow, slow, moderately slow, moderate, moderately hot, hot, very hot.","type":"string"},"conversion_table":{"description":"Gas marks ¼–10 with °F, °C and fan °C.","type":"array"}}},"formula":"°F = °C × 9/5 + 32; gas mark n ≥ 1: °F = 250 + 25·n (gas mark 1 = 275 °F, +25 °F per mark); gas mark ½ = 250 °F, ¼ = 225 °F; fan °C = conventional °C − 20; fan °F = conventional °F − 25","method":"Gas mark values follow the British scale defined in 25 °F steps from 275 °F. The 20 °C (25 °F) fan-oven reduction is the usual manufacturer guidance; recipes often round Celsius values (e.g. gas mark 6 = 400 °F = 204 °C is printed as 200 °C).","sources":[{"name":"Wikipedia – Gas mark","url":"https://en.wikipedia.org/wiki/Gas_mark","type":"reference","retrieved_at":"2026-09-24"},{"name":"Wikipedia – Oven temperatures (descriptive terms and fan-oven adjustment)","url":"https://en.wikipedia.org/wiki/Oven_temperatures","type":"reference","retrieved_at":"2026-09-24"}],"freshness":{"type":"static","max_age_seconds":null,"note":"Deterministic formula with fixed constants; results never go stale. Inputs supplied by the caller determine the output."},"examples":[{"name":"180 °C","inputs":{"temperature":180,"temperature_unit":"c"},"expected":{"celsius":180,"fahrenheit":356,"gas_mark":"4","gas_mark_exact":4.24,"fan_oven_c":160,"fan_oven_f":331,"description":"Moderate"},"url":"https://tttkmbb.com/api/v1/calculate/oven-temperature?temperature=180&temperature_unit=c"},{"name":"Gas mark 6","inputs":{"temperature":6,"temperature_unit":"gas_mark"},"expected":{"fahrenheit":400,"celsius":204,"gas_mark":"6","fan_oven_c":184,"description":"Moderately hot"},"url":"https://tttkmbb.com/api/v1/calculate/oven-temperature?temperature=6&temperature_unit=gas_mark"}],"faq":[{"q":"Why does my recipe say gas mark 4 = 180 °C when the table gives 177 °C?","a":"Gas mark 4 is defined as 350 °F = 176.7 °C; recipe writers round to the nearest 10 °C. Ovens are rarely accurate to better than ±10 °C anyway."},{"q":"Should I always reduce the temperature for a fan oven?","a":"Yes, by about 20 °C (25 °F) unless the recipe already states a fan setting; the moving air transfers heat faster. Some recipes also shorten the time by roughly 10 %."},{"q":"How do I enter gas mark ½ or ¼?","a":"As 0.5 or 0.25 with temperature_unit=gas_mark."}],"tags":["oven temperature conversion","gas mark to celsius","celsius to fahrenheit oven","fan oven conversion","convection oven temperature"],"related":[{"calculator_id":"temperature","reason":"General temperature conversion including kelvin."},{"calculator_id":"cake-pan-conversion","reason":"Adjust recipes for a different pan size."},{"calculator_id":"turkey-cooking-time","reason":"Roasting times at a given oven temperature."}],"links":{"html":"https://tttkmbb.com/food/oven-temperature","markdown":"https://tttkmbb.com/food/oven-temperature.md","json":"https://tttkmbb.com/food/oven-temperature.json","api":"https://tttkmbb.com/api/v1/calculate/oven-temperature","schema":"https://tttkmbb.com/api/v1/calculators/oven-temperature","openapi":"https://tttkmbb.com/openapi.json","mcp":"https://tttkmbb.com/mcp"},"version":"v1","updated_at":"2026-09-24"},"timestamp":"2026-09-24T01:48:09Z","next_actions":[{"tool":"run_calculator","calculator_id":"oven-temperature","reason":"Run Oven Temperature Converter with the inputs above."}],"links":{"markdown":"https://tttkmbb.com/food/oven-temperature.md"}}