Contraction Timer Calculator
Track contraction frequency, duration, and determine if it is time to call your doctor using the 5-1-1 rule.
Results
Visualization
How It Works
The 5-1-1 rule is a common guideline: contractions 5 minutes apart, lasting 1 minute each, for at least 1 hour. This suggests active labor is beginning. Always call your provider if unsure. Not medical advice.
The Formula
Frequency = Time window / (Number of contractions - 1)
5-1-1 rule: 5 min apart + 1 min long + 1 hour duration
5-1-1 rule: 5 min apart + 1 min long + 1 hour duration
Variables
- 5-1-1 — 5 minutes apart, 1 minute long, for 1 hour
- Frequency — Minutes between the start of each contraction
Example
6 contractions in 30 minutes, averaging 45 seconds each = 6 minutes apart (active labor approaching).
Tips
- Time from the START of one contraction to the START of the next
- Braxton Hicks contractions are irregular and stop with movement or hydration
- Call your provider immediately if you have bleeding, fluid leaking, or decreased movement
- First-time mothers often have longer early labor phases