Writing Goal Calculator: Deadline to Daily Target
Target length, due date, the days you actually sit down. The calculator returns the number of words that has to appear on a single writing day for the deadline to hold.
Two things most calculators get wrong
The sum itself is a division: words remaining over writing days. Two details decide whether the answer is any use.
It counts real calendar days
The usual shortcut is weeks multiplied by writing days. With 116 days until the deadline and three writing days a week, that gives 16.6 times 3, or 49.7 days. This calculator walks the calendar instead and counts how many Mondays, Wednesdays and Fridays you actually pass. Here that is 50. Half a day of difference, which changes nothing.
It does not always change nothing. I checked five cases:
| Case | Real writing days | Weeks times days | Difference |
|---|---|---|---|
| Sundays only, three weeks | 4 | 3.0 | 33 per cent |
| Sundays only, eight weeks | 9 | 8.0 | 12 per cent |
| Tuesdays and Thursdays, six weeks | 12 | 12.0 | none |
| Monday to Friday, eight weeks | 40 | 40.0 | none |
| Mon, Wed, Fri until year end | 50 | 49.7 | 1 per cent |
The pattern is clear enough. Write five days a week with six months in hand and the shortcut is fine. Write only on Sundays with three weeks left and you are out by a third. Six thousand words across four Sundays is 1,500 a day; across three it would be 2,000. That is the gap between feasible and not, and it opens up precisely when things are tight.
It builds in a buffer
The second point is less comfortable. People underestimate their own writing schedules, and they do it consistently.
Roger Buehler, Dale Griffin and Michael Ross asked students in 1994 when they would finish their honours thesis. The average prediction was 33.9 days. The average reality was 55.5. Only 29.7 per cent finished by the date they had named themselves (Buehler, Griffin & Ross, Journal of Personality and Social Psychology, 1994).
33.9 divided by 55.5 is 0.61. The calculator therefore treats 60 per cent of your planned writing days as dependable. Fifty days become thirty; 1,360 words become 2,267.
The sample was small: 33 Canadian students on a single task. That is not proof. As a correction factor it still beats the optimism it replaces, and you can switch it off, in which case the unbuffered figure stays on screen.
The study behind the most popular deadline advice has been withdrawn
Ask anyone how to handle a distant deadline and you will hear the same thing: set your own interim deadlines, evenly spaced. Almost every version of that advice traces back to one paper, Ariely and Wertenbroch, published in Psychological Science in 2002.
That paper was retracted on 2 September 2026. The notice gives three reasons: a replication raised questions about the authenticity of the original data; a dataset later shared could not be confirmed as authentic or complete; and an investigation by Data Colada called the overall findings into question. The journal states that it can no longer attest to the reliability of the results (Retraction Notice, Psychological Science, 2026).
None of that means interim deadlines are harmful. It means the advice lost its most-cited support four days before this article went up. If you are building a writing schedule today, lean less on rules distilled from studies and more on arithmetic you can check yourself. That arithmetic is at the top of this page.
Two worked examples
Dissertation chapter, 10,000 words, Monday to Friday, eight weeks. The calendar gives 40 writing days, so 250 words a day. With the buffer, 24 dependable days remain and the figure becomes 417. Both are numbers you can plan an evening around.
Novel, 80,000 words with 12,000 already written, Mon/Wed/Fri until year end. Fifty writing days, 1,360 words a day, 2,267 with the buffer. This is the point to ask honestly whether 2,267 words on a Wednesday evening after work is realistic. There are figures to compare against: full-time literary translation runs at roughly 1,250 words per working day. If the calculator lands well above that, the problem is the deadline or the length, not your work ethic.
How fast the number climbs
A daily target is not a fixed quantity. It grows with every day nothing gets written, slowly at first and then not slowly. For the novel above, 68,000 words across 50 writing days:
| Days lost | Required target | Increase |
|---|---|---|
| none | 1,360 words | starting point |
| 1 | 1,388 words | 2 per cent |
| 3 | 1,447 words | 6 per cent |
| 5 | 1,512 words | 11 per cent |
| 10 | 1,700 words | 25 per cent |
| 15 | 1,943 words | 43 per cent |
The first missed day costs 28 words a day. Nobody notices that, and there lies the trap: the first five losses feel consequence-free because they very nearly are. Around the tenth it turns. For the record, a 60 per cent buffer on 50 planned days allows for 20 missed ones, which is four weeks. Anyone who finds that generous has not yet had flu in the middle of a project.
The last line of the calculator therefore always shows what a single lost day costs. Not as a threat, but so the number stops being abstract.
When the number does not apply
During revision. Word count falls when the work goes well, so a word target punishes exactly the right behaviour. Use time, scenes or chapters; the comparison of metrics by project type sets out which unit fits which job.
In the first four weeks of a project. Until then you do not know what a typical session yields, so the calculator tells you what would be needed, not what is possible.
For research-heavy writing. A day spent reading three papers and writing nothing can be the most productive of the week.
When the deadline is not yours. A publisher’s date cannot be calculated away. Then the only variable left is length, and that answer is best settled early rather than in the final month.
Which target should I enter, draft or final?
The finished length. If you tend to cut during revision, enter a little more. For academic work the number is usually set by the department, often as a page count rather than words.
Why does it ask for weekdays instead of a number of days?
Because those are not the same thing. Three writing days a week can mean four actual sessions before a near deadline, or three, depending on which weekdays they are and when you start. Over short spans that gap reaches a third.
Does it account for holidays and time off?
No. That is what the buffer is for: it removes 40 per cent of days without asking why they went. If you have a three-week holiday inside the period, adjust the deadline or the writing days instead.
What if the result is absurdly high?
Three levers, in this order: one more writing day per week, a later deadline, less length. The fourth option, simply writing faster, is the one that rarely works.
Is anything I type stored?
No. The calculator runs entirely in your browser and nothing is sent anywhere. That is also why the values are gone when you reload the page.
What to do with it
Enter your figures and look at the buffered line rather than the one above it. If it strikes you as too high, that is the most useful thing this page can tell you, and it arrives today instead of in the last month before the deadline.
More conversions and benchmarks live under Word Goals & Metrics, and the research behind them under Data & Studies.