Spaced Repetition Optimal Interval Calculator

Calculate optimal review intervals using the SM-2 algorithm (used in Anki): interval₁ = 1 day, interval₂ = 6 days, intervalₙ₊₁ = intervalₙ × EF, where EF (ease factor) starts at 2.5 and adjusts based on recall quality.

Data set — comma or newline separated
Statistical Results — n = 8
Count (n)8
Sum (Σx)40
Min2
Max9
Range7
Q14
Q35.5
IQR1.5
Mean (μ)5
Median4.5
Mode4
Pop. Variance (σ²)4
Pop. Std Dev (σ)2
Sample Variance (s²)4.571428571
Sample Std Dev (s)2.138089935
Skewness0.65625
Excess Kurtosis-0.21875
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How It Works

Calculate optimal review intervals using the SM-2 algorithm (used in Anki): interval₁ = 1 day, interval₂ = 6 days, intervalₙ₊₁ = intervalₙ × EF, where EF (ease factor) starts at 2.5 and adjusts based on recall quality

Each component has a specific meaning:

  • SM-2 algorithm : interval₁ = 1 day — The sm-2 algorithm : interval₁ = 1 day recorded for the scenario being assessed.
  • Interval₂ = 6 days — The interval₂ = 6 days recorded for the scenario being assessed.
  • Intervalₙ₊₁ = intervalₙ × EF — The intervalₙ₊₁ = intervalₙ × ef recorded for the scenario being assessed.
  • Where EF starts at 2 — The where ef starts at 2 recorded for the scenario being assessed.

Note: Interpret the spaced repetition result against the thresholds and context described above.

How to Use

Enter the SM-2 algorithm : interval₁ = 1 day, interval₂ = 6 days, intervalₙ₊₁ = intervalₙ × EF, where EF starts at 2 for the scenario you are assessing. Calculate optimal review intervals using the SM-2 algorithm (used in Anki): interval₁ = 1 day, interval₂ = 6 days, intervalₙ₊₁ = intervalₙ × EF, where EF (ease factor) starts at 2.5 and adjusts based on recall quality. Use the spaced repetition result to inform your calculation.

Frequently Asked Questions