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Calcimator

Tire Degradation Calculator

Model lap time degradation over a tire stint. Compare compound choices and find the optimal stint length that balances tire wear against pit stop time loss.

Inputs

sec
sec
laps

Results

Average Lap Time

90.96 sec

Last Lap Time91.92 sec
Total Time Lost24 sec
Optimal Stint Length25 laps
Crossover Lap25
How to Use This Calculator
  1. Enter Fresh Tire Lap Time, Degradation per Lap, and Stint Length.
  2. Set Tire Compound.
  3. Review the Average Lap Time (sec) result.
  4. Use Last Lap Time (sec) and Total Time Lost (sec) to inform your decision.
  5. Use the chart to visualize the results and explore different scenarios by adjusting inputs.

How the result changes with Fresh Tire Lap Time

Fresh Tire Lap TimeAverage Lap Time
6969.96 sec
217217.96 sec
394394.96 sec
541541.96 sec

What each input means

Fresh Tire Lap Time
Lap time on new tires at the start of a stint. Use your best out-lap after a pit stop.
Degradation per Lap
Base time lost per lap due to tire wear. Measured from practice stint data (before compound adjustment).
Stint Length
Number of laps planned for this stint. Compare against the calculated optimal length.
Tire Compound
0 = Hard (0.7x degradation), 1 = Medium (1.0x), 2 = Soft (1.5x degradation rate).

What each result means

Average Lap Time
Mean lap time over the entire stint accounting for degradation.
Last Lap Time
Projected lap time on the final lap of the stint.
Total Time Lost
Cumulative time lost versus running every lap on fresh tires.
Optimal Stint Length
Recommended stint length that minimizes total race time (assumes ~25s pit delta).
Crossover Lap
Lap number where cumulative tire loss exceeds a pit stop time penalty.

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Fresh Tire Lap Time = 90, Degradation per Lap = 0.08, Stint Length = 25, Tire Compound = 1 = 4 input(s) provided
  2. Calculate Average Lap Time
    Average Lap Time
    90.96 = 90.96
  3. Calculate Last Lap Time
    Last Lap Time
    91.92 = 91.92
  4. Calculate Total Time Lost
    Total Time Lost
    24 = 24

Engine last updated . Checked against 2 independently-derived tests — how we verify calculators.

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