How Formula 1 Teams Calculate Whether an Extra Pit Stop Pays Off

The Basic Break-Even Equation

When an F1 team considers making an additional pit stop, the initial theoretical test asks whether the car has enough remaining race distance to earn back the time lost by pitting. At its simplest, this break-even point is found by dividing the net time lost against staying on track by the expected average pace gain per lap on fresh tyres.

Under an illustrative model where a pit stop costs an assumed 20.0 seconds of net time and delivers a 1.0-second-per-lap pace advantage, a driver requires exactly 20 usable laps just to break even. If the expected pace gain drops to 0.5 seconds per lap, recovery stretches to 40 laps, while an advantage of 2.0 seconds cuts the required distance to 10 laps. These baseline calculations assume a constant lap-time delta and a fixed loss, providing a rough threshold rather than observed tyre compound performance.

Stop Duration Versus Net Time Lost

A common pitfall when evaluating pit windows is confusing the recorded duration in pit lane with the net elapsed time lost to rivals. For instance, the FIA timing summary for the 2024 Monaco Grand Prix logged Valtteri Bottas with a Lap 15 pit-stop duration of 24.239 seconds, but that figure only measures travel and stationary service within the pit lane.

Evaluating an actual F1 pit stop strategy time loss requires comparing the full sequence of pit entry, stationary work, and pit exit against the time rivals take to circulate the track at racing speeds. Because that comparison varies with local speed limits, circuit layout, and whether rivals are running under green-flag or neutralized conditions, a raw stopwatch reading from pit lane cannot serve as a universal benchmark.

Why Real Races Complicate the Model

In practice, the theoretical pace gain rarely arrives as a smooth, predictable number on every lap. Tyre warm-up, uneven rubber degradation, changing fuel loads, and track temperatures constantly reshape how much grip a driver can actually exploit.

More importantly, raw lap-time gains only benefit a team if track position permits it. Rejoining behind slower cars can erase an expected pace advantage or leave a driver unable to overtake, meaning strategy models must treat the break-even calculation as an initial screening tool rather than a final verdict.

Official reference: FIA 2024 Monaco Race Pit Stop Summary.