Based on scientific memory research, our spaced repetition calculator helps you determine optimal review intervals. Through the Ebbinghaus forgetting curve and modern memory algorithms, optimize your learning efficiency.

How the Calculator Works

Our calculator is based on the following scientific principles:

• 1Ebbinghaus Forgetting Curve: Describes how memory decays over time
• 2SuperMemo Algorithm: Adjusts review intervals based on memory difficulty
• 3Cepeda Optimal Intervals Research: Determines optimal intervals for different learning goals
• 4Cognitive Load Theory: Balances learning intensity and memory effectiveness
• 5FSRS Algorithm: Modern adaptive interval calculation

Supported Algorithm Types

Online Calculator

Select your learning type and goals to get personalized review interval recommendations:

Advantages of Using Spaced Repetition

• ✓Improved memory efficiency: Scientific interval arrangement reduces forgetting
• ✓Time savings: Avoid over-reviewing and ineffective repetition
• ✓Long-term memory retention: Optimize formation and retention of long-term memory
• ✓Personalized learning: Adjust review strategies for different content
• ✓Reduced learning stress: Reasonable distribution of learning load

Use Cases

Usage Tips

• 💡Choose appropriate algorithm: Select the most suitable algorithm based on learning content and goals
• 💡Stick to execution: Strictly follow calculated intervals for review
• 💡Record effectiveness: Track learning results, adjust strategy when necessary
• 💡Consider practicality: Consider personal schedule and learning habits
• 💡Regular evaluation: Regularly assess memory effectiveness, optimize interval settings