Combine grid size, completion time, and mistakes into transparent practice metrics. The calculator shows every input, intermediate value, and formula, including an adjustable error penalty. Add an earlier personal result to compare like-for-like attempts, then copy the summary or explicitly save it to the local progress tracker.
Higher points mean more cells per unit of adjusted time under this visible rule. This is a site-defined personal practice reference, not a medical or ability score.
Cell count is grid size squared. Seconds per cell is raw time divided by cell count. Error-adjusted time adds the selected penalty for every mistake. Practice efficiency points equal cell count divided by adjusted time, multiplied by 100. The default penalty is two seconds, but zero, one, two, and three are available.
The formula is a comparison convention created for this website, not a validated scientific scale. It has no 100-point ceiling because it represents correctly processed cells per adjusted unit of time. A higher value means more cells per adjusted time under this rule and nothing broader.
Raw time alone can reward rushed clicking. Adding a visible error penalty lets mistakes affect the comparison without hiding how much was added. Try another allowed penalty if it better fits your personal routine, but keep the same setting when comparing a series of attempts.
Efficiency accounts for cell count, which makes it more informative than raw duration across sizes, but the tasks still differ in density and search path. Treat cross-size comparisons as informal. The strongest personal comparison keeps grid size, mode, input method, device, and penalty unchanged.
Enter an earlier time and mistake count to see adjusted-time change, efficiency change, and the change in mistakes. Negative adjusted-time change means the current adjusted time is shorter. Positive efficiency change means more efficiency points under the same formula. Invalid or zero baselines are not divided.
A 5×5 completed in 25 seconds with no mistakes gives 1.00 second per cell, 25 adjusted seconds, and 100 points. The same grid in 25 seconds with two mistakes gives 29 adjusted seconds and about 86.21 points. A 4×4 in 20 seconds with one mistake gives 22 adjusted seconds and about 72.73 points.
The output does not measure intelligence, attention, eyesight, reading ability, or a clinical condition. It is not based on a public ranking or population dataset. Use it as an informal way to document your own comparable practice, and keep the original time and mistake count beside the calculated points.
It is the visible default convention used by this site; you may choose zero, one, two, or three seconds.
Yes. It has no fixed ceiling because the formula scales cells processed per adjusted second.
No. It is saved to the local tracker only after you press Save to tracker.
Enter seconds such as 25.4 or a clock value such as 1:05.250.