The short answer
To convert a hand time to fully automatic timing (FAT), add about 0.24 seconds for sprints up to 200m and about 0.14 seconds for races of 300m and longer. A stopwatch starts late on a human reaction, so it flatters the runner. FAT is required for records and most college recruiting standards.
Key takeaways
- Add 0.24s to hand times for sprints up to 200m; add 0.14s for 300m and longer
- NFHS uses a simpler rule: round up, then add 0.24s to every race
- A hand time is faster than reality because the timer reacts to the gun, not the runner
- Records, rankings and most recruiting standards require FAT, never hand times
- A hand-timed 11.0 is roughly an 11.24 FAT, a meaningful gap at the line
The short answer
To convert a hand-timed mark to fully automatic timing, add about 0.24 seconds for sprints up to 200m and about 0.14 seconds for races of 300m and longer. So a hand-timed 11.0 in the 100m is roughly an 11.24 FAT, and a hand-timed 50.0 in the 400m is roughly a 50.14 FAT. The conversion always makes the time slower, because a stopwatch flatters the runner.
Why slower? A human timer cannot start the watch the instant the gun fires. The thumb reacts to the sound, which takes roughly two-tenths of a second, so the clock starts late and the recorded time is short. At the finish the timer anticipates the chest crossing the line, shaving a little more. Net result: hand times read fast, and the shorter and more reaction-driven the race, the bigger the error.
The standard add-on
The accepted conversion between fully automatic timing and manual timing is 0.24 seconds: MT + 0.24 = FAT. NFHS applies this 0.24 to every race after rounding the hand time up.
Source: NFHS, Converting Times: Manual to FAT (nfhs.org)
The two conversion conventions
There are two systems you will run into, and they disagree slightly. Know which one a meet or database is using before you compare marks.
- The NFHS rule (high school): round the hand time up to the next tenth, then add 0.24 seconds, for every race regardless of distance. Simple and uniform.
- The conventional rule (record-keeping and Track and Field News): add 0.24 seconds for sprints under 300m, but only 0.14 seconds for races of 300m and up. This reflects that reaction error matters less as a percentage of a longer race.
Most online databases, including Athletic.net, lean on the conventional split. The NFHS version exists to keep prep meets consistent and easy to administer. Neither is wrong; they answer slightly different questions. For comparing a 100m, both add 0.24, so the systems only diverge once you hit 300m and beyond.
Conversion table for common events
Here is the conventional conversion applied to typical marks. Round up first if you are following NFHS, then add 0.24 across the board instead of the split shown here.
Hand time to FAT, common events
Conventional conversion: add 0.24s up to 200m, 0.14s for 300m and longer.
| Event | Add | Hand time | FAT equivalent |
|---|---|---|---|
| 100m | +0.24 | 11.00 | 11.24 |
| 100m / 110m hurdles | +0.24 | 15.00 | 15.24 |
| 200m | +0.24 | 23.00 | 23.24 |
| 300m | +0.14 | 38.00 | 38.14 |
| 400m | +0.14 | 50.00 | 50.14 |
| 800m | +0.14 | 2:00.0 | 2:00.14 |
| 1600m / mile | +0.14 | 4:30.0 | 4:30.14 |
| 3200m / 2 mile | +0.14 | 10:00.0 | 10:00.14 |
Round before you add (NFHS)
Under NFHS rules you round the hand time up to the next tenth first, then add 0.24. An 8.51 hand time in the 55m hurdles rounds to 8.6, then converts to 8.84, not 8.75. Skipping the rounding step is the most common conversion mistake.
Why the gap matters
Two-tenths of a second is enormous in a sprint. At a flat 10 meters per second, 0.24 seconds is more than two meters of track, the difference between winning and missing the final. When a recruiter sees a hand-timed 10.8 100m, they mentally translate it to about 11.04 FAT and judge you on that. Treating a hand time as if it were FAT is the fastest way to overrate a mark.
It also explains why old hand-timed records look suspiciously fast next to modern electronic marks. Before fully automatic timing became standard, sprint records were set on stopwatches and carried that built-in advantage. That is exactly why governing bodies drew a hard line. To see how the electronic era reshaped the sprint, our 100m world record progression tracks where the FAT cutoff changed everything.
When FAT is required, and hand timing is not enough
For anything official, the answer is the same: you need fully automatic timing. World Athletics requires FAT to ratify sprint and middle-distance records. College recruiting standards and conference qualifying lists are almost always FAT. Hand times still have a place at small dual meets and in practice, where a stopwatch is all you have, but they cannot become a record or a verified personal best.
- Records and rankings: FAT only, no exceptions for sprints and middle distance.
- College recruiting: coaches expect FAT marks and discount converted hand times.
- Practice and small meets: hand timing is fine for training feedback, just label it honestly.
The practical takeaway: time however you can, but always note whether a mark is hand or FAT, and convert before you compare. A self-recorded phone time is even rougher than a hand time, so treat any time you take yourself as a training number, not a real PR. What a phone video can do reliably is show you the technique, which is the part you can actually change between races.