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Does Homework Actually Work? What Cooper's Meta-Analyses Found — and Why the Grade Level Matters

By Leon MoriguchiPublished May 15, 2026Updated May 18, 20265 min read日本語版あり
Audience
Parents of children in lower to middle elementary school grades

TL;DR

  • ·Four decades of research show that homework quantity correlates with academic achievement only from high school onward; for elementary school children, the correlation is approximately zero — "more is better" has no evidential foundation at this age
  • ·More parental involvement does not simply mean better grades: the association with achievement flips direction by grade and subject, and "rule-setting" involvement (deciding when and where homework happens) showed the strongest positive link
  • ·The "grade times 10 minutes" guideline — 10 minutes per grade level per night — gives a practical ceiling; if assigned homework substantially exceeds it, raising this with the teacher is a reasonable step

Contents

  1. Lead
  2. Background: Three Types of Homework
  3. Cooper's Meta-Analyses: The Core Finding
  4. The Parental Involvement Paradox
  5. What Homework Can and Cannot Change
  6. Practical Takeaways
  7. Summary
  8. References

Lead

"Did you do your homework?" is the default evening prompt in many households. Homework has been treated, largely without examination, as something that improves children's learning. Schools believe it; families accept it.

Researchers, however, have spent more than 40 years producing a careful answer to that question. Their conclusion diverges somewhat from common sense: the effect of homework on academic achievement varies enormously by grade level.

This article steps back from "how to do homework better" and asks the more fundamental question: does it work at all?

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