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Stop a hidden timer at four target durations and compare the deviation.
Press SPACE or click
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You'll see four target durations (10, 20, 30, and 45 seconds). For each one, click or press SPACE when you think exactly that much time has passed. Score is the average percentage you were off across all four trials.
Click or SPACE
Mouse and touch input also work.
Metric
avg deviation %
Difficulty
Easy
Use the same device and similar conditions when comparing runs. Your saved personal best and repeated results show your own trend; public leaderboard entries provide current competition context, not a population benchmark.
The percentage difference between each hidden target duration and the moment you stop the timer.
You'll see four target durations (10, 20, 30, and 45 seconds). For each one, click or press SPACE when you think exactly that much time has passed. Score is the average percentage you were off across all four trials.
Average percentage deviation provides a task-specific value for comparing your own runs under similar conditions.
Time Estimation | Free Online Cognitive Test by BrainRivals