ExactUnits
↑↓ move ↵ open Esc close All shortcuts

Oven temperature conversion calculator

Fan ovens circulate air and cook faster, so recipes written for a conventional oven need about 20 degrees Celsius knocked off.

degrees C
Fahrenheit
356degrees F
= Exact Oven temperature
Celsius
180 degrees C
Fan oven, Celsius
160 degrees C
Fan oven, Fahrenheit
320 degrees F
Gas mark
5.2
Kelvin
453.15
Show the working
  1. Temperature = 180
  2. Fan oven reduction = 20
  3. Celsius = 180 = 180
  4. Fahrenheit = 180 * 9/5 + 32 = 356
  5. Fan oven, Celsius = 180 - 20 = 160
  6. Fan oven, Fahrenheit = 160 * 9/5 + 32 = 320
  7. Gas mark = (180 - 121.111111111111) / 13.888888888889 + 1 = 5.24
  8. Kelvin = 180 + 273.15 = 453.15

Values are shown to six significant figures here; the arithmetic itself runs on exact fractions and is only rounded where a number is printed.

Scenarios & local history

Compare a saved scenario

Recent calculations

    The formula

    • F = C x 9/5 + 32, exactly
    • gas mark 1 is 275 F and each mark is 25 F, so gas mark = (F - 275)/25 + 1
    • fan ovens: subtract about 20 degrees Celsius from the conventional setting

    The Celsius to Fahrenheit conversion is exact. The gas mark scale is defined in Fahrenheit, which is why its Celsius equivalents are awkward numbers.

    Domestic ovens routinely run 15 to 25 degrees away from their dial. An oven thermometer is the cheapest baking upgrade there is.

    Oven settings

    Gas mark Fahrenheit Celsius Fan Celsius Description
    1/4 22511090Very cool
    1/2 250120100Very cool
    1 275140120Cool
    2 300150130Cool
    3 325160140Moderate
    4 350180160Moderate
    5 375190170Moderately hot
    6 400200180Moderately hot
    7 425220200Hot
    8 450230210Hot
    9 475240220Very hot

    Celsius figures are the conventional rounded settings printed on oven dials, not exact conversions.

    Related calculators

    Settings

    Theme

    System follows your operating system and changes with it.

    Text size
    High contrast

    Maximises text and border contrast and removes the grid background.

    Graph-paper background
    Round to
    Notation
    Thousands separators
    Decimal mark
    Nearest fraction

    Shows the result as the nearest tape-measure fraction, with the error it costs.

    Accessibility & interaction
    Reduce motion Stops interface animations even when the operating system does not.
    Underline links Keeps links visually distinct without relying on colour.
    Larger touch targets Makes buttons and form controls easier to tap.
    Shorter reading lines Limits article width for easier scanning.
    Monochrome display Removes colour as an information cue.
    Always-visible focus Makes the keyboard focus ring persistent and stronger.
    Verbose screen-reader results Announces the complete conversion equation.
    Sticky action bars Keeps converter and calculator actions within reach.
    Select values on focus Replaces a value immediately when you start typing.
    Left-handed mobile layout Moves key mobile actions toward the left thumb.
    Your data

    Settings, recent conversions and favourites live in this browser only. Nothing is sent anywhere.

    Offline library