After every Grand Prix, there is a brief moment that is rarely shown on television. After exiting the vehicle and removing the balaclava, the driver stands on the scales. Like a boxer at a weigh-in, it appears almost ceremonial, but the goal is completely different. How much of him has vanished over the past two hours is what the FIA wants to know.
Most of the time, the weight falls between two and three kilograms. That’s about four to six and a half pounds lost, mostly through perspiration. It may be closer to two in the cooler races, such as an autumnal race at Spa or a rainy afternoon at Silverstone. It can reach four degrees Celsius in Singapore, where humidity stubbornly hovers around 90 percent and the cockpit barely reaches 50 degrees. George Russell, one of the taller men on the grid at 1.85 meters, has talked about losing nearly 4 kg of fluid in an hour and a half. That represents about three to four percent of his body weight. A doctor would typically be concerned about that kind of figure.
| Detail | Information |
|---|---|
| Average weight loss per race | 2–3 kg (4.4–6.6 lbs) |
| Extreme conditions (Singapore, Qatar) | Up to 4 kg or nearly 9 lbs |
| Cockpit temperature | 50–60 °C (122–140 °F) |
| Calories burned per race | Around 1,500 |
| Body weight lost (percentage) | Up to 5% |
| Minimum driver weight regulation (since 2019) | 80 kg (including suit, helmet, shoes) |
| Minimum car weight (2024–2025) | 798 kg |
| G-forces experienced | Up to 6G in corners and braking |
| Primary cause of weight loss | Dehydration through sweating |
| Recovery method | Rehydration, electrolytes, post-race nutrition |
| Notable case | Lewis Hamilton — up to 10 lbs in 1h 45m |
The fact that everything has become so routine is what makes it peculiar. Drivers prepare for it. In order to prepare his body for the summer heat in Europe, Russell begins layering up for Singapore in late August. He wears three layers on top and three on the bottom. In a way, the planning starts in January. The entire year’s fitness arc has been subtly tilting toward that one race by the time the calendar reaches the Marina Bay Street Circuit in September.
On the longer end of the spectrum, Lewis Hamilton has claimed to be able to lose up to ten pounds in an hour and forty-five-minute race. In less time than a flight from London to Geneva, that is nearly a fifth of an adolescent’s body weight. Naturally, it’s mostly water—the body recovers it in a day or two—but the loss is significant. Sweat carries minerals, salts, and electrolytes. Drivers don’t immediately start drinking from a bottle as soon as they get out of the car for a reason. If you use too much water too quickly, the system will tip in the opposite direction.
All of this is powered by the cockpit itself. It’s not really a chair when you’re sitting inches away from a power unit that generates nearly a thousand horsepower, wearing a fireproof suit that can withstand a fuel fire for eleven seconds, wearing gloves, a helmet, and a harness that is so tight it could bruise you. It’s a steering wheel-equipped oven. The calorie burn begins to make sense when you add the G-forces of up to six in the heavy braking zones. For a 70-kilometer driver, this means his neck is momentarily bearing the weight of a small refrigerator. Most estimates put the number of calories per race at 1,500. Not much more energy is burned by a marathon runner.
The race that ultimately compelled the sport to examine itself more closely was Qatar 2023. Drivers throwing up in their helmets, Logan Sargeant retiring due to illness, and Esteban Ocon allegedly feeling ill inside his cockpit while continuing to race were all signs of that night’s extreme heat. The FIA then mandated the use of cooling shirts for hot events. Observing all of this gives the impression that the sport had been quietly putting up with something near the human limit for years, and that Qatar was just the night the bill came due.
When a driver steps onto those post-race scales, it’s difficult to ignore how narrow the margin actually is. They appear particularly worn out, hollow-eyed, and a little unsteady. Lando Norris reluctantly acknowledges that he might have to drink during races after previously refusing to do so because the bottle made him feel ill. In any case, the car’s drink system frequently malfunctions; bottles are frozen on the grid with the expectation that they will melt by lap twenty. They don’t all the time.
So, two to three kilograms. When written down, it sounds tiny. In actuality, it makes the difference between a driver who finishes a race and one who almost doesn’t.