An IndyCar set up for a road course must weigh at least 1,785 pounds, or 809.7 kilograms, without the driver and without fuel. On short ovals the minimum drops to 1,770 pounds (802.9 kg), and on speedways such as Indianapolis to 1,740 (789.3 kg). These are the figures in the 2026 NTT INDYCAR SERIES rulebook, and the very fact that there are three of them tells you something: in America the same car changes its skin, and its weight, depending on the track it races on.

Then there is the driver, who in the eyes of the rulebook always weighs 185 pounds, ballast included. But let’s take it one step at a time, because the question “how much does an IndyCar weigh” only has a precise answer once you say where, with whom on board and in which year.

Three minimum weights, depending on the track

The minimum weight is set by rule 14.4.1.1 of the IndyCar rulebook and refers to the car in ready-to-compete condition, excluding the driver, the driver’s compensating ballast, fuel and the contents of the drink bottle. When the car is weighed, the tank must be empty.

The rulebook does not explain why there are three figures, but the most likely reason lies in how the series uses its car. IndyCar has a single chassis, the Dallara DW12, in service since 2012 and updated in 2018 with the universal aero kit, but it dresses it differently: on road courses it runs a high-downforce aero package, at Indianapolis a lean, low-drag one designed to go beyond 370 kilometres per hour. The car’s ballast, used to reach the minimum, can sit in one place only: the keel, on the floor of the car.

The driver weighs 185 pounds, by rule

Here the American rulebook is more elegant than you might think. Every driver is brought up to 185 pounds (83.9 kg) by adding a dedicated ballast to their body weight, the so-called driver equivalency weight. A lighter driver carries more ballast; a heavier one gets an equivalent reduction in the car’s minimum weight. The result is that the driver’s build, in practice, does not shift the overall weight of the car.

Adding the two figures together, a road-course IndyCar takes to the track at no less than 1,970 pounds, about 894 kilograms, still without a drop of fuel. That is the number to keep in mind when comparing it with other categories.

The hybrid and the 2024 diet

Today’s weight is the result of a deliberate choice. On 7 July 2024, at the Honda Indy 200 at Mid-Ohio, IndyCar ran its first race with the hybrid system: a motor generator unit and a supercapacitor energy store, twenty ultracapacitors in all, housed in the bellhousing between the 2.2-litre twin-turbo V6 and the gearbox. It recovers energy under braking and gives it back as horsepower, which the driver can add to Push to Pass to go beyond 800 in total.

More power, but also more pounds. To offset them, at the start of 2024 the series had already lightened several parts of the car, beginning with the aeroscreen, the cockpit protection introduced in 2020, rebuilt in a second, lighter version. A necessary diet for a car that, between safety and technology, had put on a fair amount of weight over the years: more than 50 pounds with the aeroscreen and over 100 with the hybrid.

Heavier than a Formula 1 car, much lighter than a NASCAR

The comparison with Formula 1 needs care, because the two rulebooks weigh different things. The 2026 F1 minimum is 724 kilograms plus the nominal tyre mass set by Pirelli, around 770 kilograms in the race, driver included and fuel excluded: some thirty less than in 2025, when it stood at 800. A road-course IndyCar with its 185-pound driver is around 894. In other words, under comparable conditions the American car is more than 120 kilograms heavier. If you want to know what that means in terms of speed, the full comparison is in IndyCar versus Formula 1; if you look at F1 as a sponsor, you can start from our page on how to sponsor in Formula 1.

At the other end of the scale sits NASCAR. The Cup Series Next Gen car weighs at least 3,200 pounds, about 1,451 kilograms, without driver and fuel: around 80% more than an IndyCar. Two different worlds, which we have put side by side in our comparison of NASCAR and IndyCar.

The 2028 IR-28: a hundred pounds lighter

The next IndyCar was unveiled on 28 July 2026, for now only in renderings. It is called the IR-28, it will debut in 2028 and it will weigh about a hundred pounds (45 kilograms) less than the current car. It will have a 2.4-litre twin-turbo V6 capable of up to 760 horsepower and a hybrid system around twenty pounds lighter, with the first battery-based energy store in the series’ history in place of the supercapacitors.

The stated goal is a better power-to-weight ratio, easier overtaking and lower lap times, to the point of threatening the Indianapolis records, unbeaten since 1996 on both the single lap and the four-lap qualifying run. Thirty years later, the shortest road to speed still runs across the scales.

Weight and cost

Every kilo taken off a single-seater costs money, in materials and in engineering hours, and it is one of the reasons why a complete IndyCar is not a cheap object. How much it really costs, between chassis, aero kits and engine lease, we have worked out item by item in our article on the cost of an IndyCar. For a company the next question is a different one again: how much does it cost to get on board with your own brand, and what do you get in return. That is the subject of our guide to IndyCar sponsorship.