ExactUnits
↑↓ move ↵ open Esc close All shortcuts

Roast cooking time calculator

Roasting time scales with weight, but not linearly — a bigger joint has proportionally less surface. The rate here is the usual linear approximation plus a fixed head start.

minutes
%
Cooking time
2:10:00
= Exact Roast cooking time
Resting time
26 minutes
Total time to allow
2:36:00
Cooking time in minutes
130
Effective rate
65.0 min/kg
Show the working
  1. Weight = 2
  2. Meat and doneness = 55
  3. Fixed extra time = 20
  4. Rest as a share of cooking time = 20
  5. Cooking time in minutes = 2 * 55 + 20 = 130
  6. Resting time = 130 * 20 / 100 = 26
  7. total_minutes = 130 + 26 = 156
  8. Cooking time = 130 * 60 = 7800
  9. Total time to allow = 156 * 60 = 9360
  10. Effective rate = 2 > 0 ? 130 / 2 : 0 = 65

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

    • time = weight x rate + fixed extra
    • rest = cooking time x rest share

    Time-per-weight rules are a starting point. A probe thermometer in the thickest part is the only reliable test of doneness.

    Meat carries on cooking while it rests: internal temperature typically rises another 2 to 5 degrees Celsius.

    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