F1 Reaction Test

How the F1 start lights work

A Formula 1 race starts from a standstill, under five red lights on the start gantry. Article B5.7.2 of the FIA 2026 Formula 1 Sporting Regulations sets out the sequence:

1. Once every car has stopped in its grid slot, the first red light comes on, followed by the second, third, fourth and fifth.
2. The gap between one light and the next is fixed at one second.
3. At any time after the fifth light is lit, all the red lights go out together. Lights out is the start signal.

The rulebook gives no range for that final wait. It leaves the interval between the fifth light and lights out at the sole discretion of the permanent starter and names no numbers. Formula1.com has described a randomly chosen, computer-controlled wait of 0.2 to 3 seconds, but those figures are not in the regulations.

Cars must stay still from the third red light until lights out, and each must sit where the timing transponder can detect the moment it first moves. A false start can bring anything from a 5-second penalty to a stop-and-go (Article B5.11.1). Since 2026 the grid panels also flash blue for five seconds before the red lights begin, giving drivers time to build revs, according to Formula1.com.

How to use this F1 start timer

This F1 reaction test copies that sequence and adds a random hold of its own. Use the F1 start lights above:

1. Press the panel, the Space bar or Enter to arm the start.
2. Watch the five red lights come on one at a time, one second apart.
3. After the fifth light, they stay on for a random 0.2 to 3.0 seconds. That range is our choice, modeled on the Formula1.com description, not a rule.
4. React the instant they go out, with a click, a tap, Space or Enter.

Press before lights out and the run is shown as a jump start and not timed. A press that lands too soon after lights out to be a genuine reaction counts as a jump start too.

The clock runs from the animation frame in which the lights actually go dark to the moment your finger goes down, using the browser's high-resolution timers. Your best F1 time is kept for this session only. The test is free, and your times stay on your device.

How your F1 reaction time compares

Formula1.com says F1 drivers launch their cars, on average, about 0.2 seconds after the lights go out. It is tempting to hold your score up against that, but the two numbers measure different things.

• A race start is timed to the car moving, which the timing transponder detects.
• F1's Start Analysis broadcast graphic, introduced in 2021, defined reaction time as lights out to the driver releasing the hand clutch to its halfway, slipping position, according to SVG Europe.
• Launching means letting out the clutch with a steering-wheel paddle while feeding in throttle, as Formula1.com explains. An online F1 reaction time test asks for one press.
• Your time here also includes the delay of your screen, input device and browser.

So a click time is not a race start, in either direction. To see how your number compares with other people on a standard test, read the average reaction time guide.

Tips for faster F1 starts

• Do not guess. The hold after the fifth light is random, so anticipating it mostly earns jump starts.
• Watch the whole row, since lights out means all five going dark at once.
• Rest a finger lightly on the key or mouse button.
• Stick to one device. Screens, mice, keyboards and touch panels each add their own delay, so scores from different devices do not compare.
• Close heavy tabs so the browser can draw each frame on time.
• Do a few warm-up starts, then judge yourself on several runs, not one lucky one.

Try the main reaction time test

The F1 test gives you a countdown to focus on. For a plain measure of how fast you respond to a single visual signal, without the five-light build-up, take the main reaction time test and then see where you stand on the average reaction time page.