Divide actual by estimated.
15 ÷ 10 = 1.50
25 ÷ 20 = 1.25
45 ÷ 30 = 1.50
TASK TIME ESTIMATE CALCULATOR
Was it really
a ten-minute task?
Put the estimate beside what happened. Compare three completed tasks, then see what their timing would imply for one new planning example.
Compare my minutes ↘Free browser tool · No account · No productivity score
ILLUSTRATIVE EXAMPLE
ESTIMATED10m
OBSERVED15m
Useful information. Not a personal verdict.
START WITH THREE OBSERVATIONS
Compare like with like.
Choose broadly similar tasks and use the same meaning of “actual” for all three: either focused work or total elapsed time. The prefilled values are examples.
MIDDLE ACTUAL / ESTIMATE RATIO
1.50×
The median of the three task ratios.
ILLUSTRATIVE ADJUSTED TIME
30 min
+10 min versus your new estimate
EstimatedActual
This is a scenario, not a forecast. Task scope, interruptions and unfamiliar work can change the next result. Check your actual commitments before treating the number as usable planning time.
THE WORKED EXAMPLE
Three ratios.
One visible assumption.
Take the middle ratio.
Sort them: 1.25, 1.50, 1.50. The middle value is 1.50. This is not the ratio of the total minutes.
Try a planning scenario.
A new 20-minute estimate multiplied by 1.50 gives 30 minutes. That is ten more minutes in this example, not a promise about the next task.
A ratio below one means the task took less time than estimated. A ratio above one means it took more. Neither result measures effort, ability or how well you used the time.
What belongs in the comparison?
A familiar routine is different from learning a new process. If one task included a long interruption and the others did not, decide whether you are comparing focused work or real-world elapsed time. Do not silently change that definition to get a tidier number.
KEEP OBSERVING, ONE TASK AT A TIME
Make the next step small.
Keep the timing real.
Now combines a one-task screen, editable first steps, short focus timers and a Brain Dump. Its Time Mirror compares your estimates with recorded time; optional Pro adds fuller history and insights.
Explore Now on the App Store ↗Check the listing for current free features and purchase options. This browser calculator is separate and does not sync your entries into Now. Neither is a diagnostic tool.
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Open Now: ADHD Task Starter on the App Store
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What the number can tell you.
Why use the median instead of an average?
This tool uses the middle of three ratios so its rule is easy to inspect. It is one descriptive choice, not a validated model for predicting your future work. A different summary can produce a different planning scenario.
Does this calculate a deadline?
No. It has no information about your calendar, breaks, priorities, travel or other commitments. The result is only an arithmetic example in minutes.
What about a task that took zero minutes?
This version accepts positive whole minutes only. Use completed tasks with an actual duration you can describe; it does not handle cancelled tasks or seconds.
Are the times saved?
No. Inputs stay on this page and are not submitted or saved by the tool. The copy button places the review on your clipboard when you choose it.
Useful for someone else?
Share the public guide. Your entries and results are not included.
Open the public guide link