Sleep Efficiency Calculator
Calculate what percentage of your time in bed was actually spent asleep. The calculator runs in your browser and does not send or store your data.
Calculate your sleep efficiency
This tool uses wall-clock minutes between the two times and does not adjust for daylight-saving transitions.
Formula
Sleep efficiency = estimated sleep time divided by time in bed, multiplied by 100.
Important note
Sleep efficiency is one common way to summarize a sleep diary. It is not a diagnosis. If you have ongoing sleep problems, talk to a qualified healthcare professional.
Track it for 14 nights
A single night can be noisy. For a clearer pattern, use the free sleep diary template and track your sleep for 14 nights.