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Words Learned Per Day Calculator

Work out words learned per day instantly with clear inputs, formula shown and shareable results.

About Words Learned Per Day Calculator

Because not everything studied is retained, the daily target must be inflated by the reciprocal of the retention rate. Learning 3000 words in twelve months at 80% retention means studying 3750, or 10.3 a day. At about 90 seconds per new card including reviews, that is roughly fifteen minutes daily.

Formulas

Gross words needed

gross = target / retention rate

Daily rate

per day = gross words / (months x 30.4375)

Worked example

With the default values below, Words Learned Per Day Calculator returns New Words Per Day of 10.3. Change any input above and every figure here is recalculated in your browser.

Inputs used

Words to learnminimum 1
3,000
Months availableminimum 0.1
12
Long-term retention rateaccepts 1–100 %
80 %

Results

New Words Per Day
10.3 words
Words To Study Allowing For Forgetting
3,750
Estimated Study Time Per Day
15 min
New Words Per Week
71.9

Step by step

  1. 1Values used
  2. 2Gross words needed
  3. 3Daily rate
  4. 4New Words Per Day= 10.3 words
  5. 5Words To Study Allowing For Forgetting= 3,750
  6. 6Estimated Study Time Per Day= 15 min
  7. 7New Words Per Week= 71.9

Assumptions and limits

  • The result is derived only from the 3 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
  • Figures are rounded for display to 1 decimal place, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

How many new words a day is sustainable?

Ten to twenty for most learners using spaced repetition. Above thirty the daily review load usually becomes unmanageable within weeks.

Why does review time grow?

Because each new word generates future reviews. Steady-state review load is roughly ten times the daily new-card rate.

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