间隔重复计算器
使用此间隔重复计算器快速获得准确的计算结果。
留存率
78.0
Cards Needing Review22
Cards Learned per Session15.6
Retention Rate vs Total Flashcards
公式
How to Calculate Flashcard Retention
Retention rate measures how many flashcards you can recall correctly.
Formula
Retention Rate = (Correctly Recalled / Total Cards) x 100
Aim for 85–95% retention. Below 85% means you are reviewing too many new cards. Above 95% means you can add more.
计算示例
A student has 100 flashcards, recalls 78 correctly after 5 study sessions.
- 01Retention rate = (78 / 100) x 100 = 78%
- 02Cards needing review = 100 - 78 = 22
- 03Cards learned per session = 78 / 5 = 15.6
常见问题
What is a good flashcard retention rate?
Aim for 85–90%. This means you are being challenged but still retaining most material. Adjust new card intake to maintain this range.
How many new cards should I add per day?
Start with 10–20 new cards per day. Adjust based on your retention rate. If it drops below 80%, reduce new cards.
Should I study cards I already know?
Yes, periodic review prevents forgetting. Spaced repetition systems automatically schedule reviews at optimal intervals.