Effect snapshot
Intervention Pilot 32-hour four-day week with same pay for 6+ months
Outcome Revenue or output per employee
Effect 0–8 percent relative increase
Confidence study
Context UK and Iceland pilots, knowledge work, 2022–2025

Sources

What changes

Well-run four-day pilots often report flat to +8% relative output with higher wellbeing—results vary by industry.

When this tends to work

  • Conditions similar to: UK and Iceland pilots, knowledge work, 2022–2025
  • You can measure Revenue or output per employee reliably
  • The intervention is implemented consistently, not half-measured

When to be careful

  • Your audience or product differs materially from the cited context
  • Compliance costs or second-order effects outweigh the lift
  • Evidence label is study—treat wide ranges as planning bands, not promises

Practical takeaway

Use the cited range for prioritization and test design. Verify against your own data before scaling.