Contraction Timer Calculator
Track contraction duration, frequency, and pain level to estimate labor progress and determine when to head to the hospital. Useful during active labor for first-time and experienced mothers.
About this calculator
Labor readiness is assessed using the classic 5-1-1 rule (or 4-1-1 for first-time mothers): contractions lasting at least 45–60 seconds, occurring every 4–5 minutes, for at least 1 hour. This calculator computes an urgency score based on those parameters plus pain intensity. The formula combines time between contractions, contraction duration, pattern duration, and pain level: urgencyScore = (10 − timeBetween) + (contractionDuration / 10) + painScore + (patternHours × 0.5). If hospital criteria are met, the score is multiplied by 10; otherwise by 5. For first-time mothers, the threshold is contractions ≤4 min apart, ≥60 s long, for ≥1 hour. For subsequent births, the window tightens to ≤5 min apart and ≥45 s duration. Pain is scored as mild=1, moderate=3, severe=5.
How to use
Suppose you are a first-time mother with contractions lasting 65 seconds, occurring every 3.5 minutes, in a pattern for 1.5 hours, with severe pain. Hospital criteria check: 3.5 ≤ 4 ✓, 65 ≥ 60 ✓, 1.5 ≥ 1 ✓ → hospital time = true. urgencyScore = (10 − 3.5) + (65 / 10) + 5 + (1.5 × 0.5) = 6.5 + 6.5 + 5 + 0.75 = 18.75. Final score = round(18.75 × 10) = 188. A high score indicates you should head to the hospital promptly.
Frequently asked questions
What is the 5-1-1 rule for contractions and when should I go to the hospital?
The 5-1-1 rule means contractions are 5 minutes apart, last at least 1 minute each, and have followed this pattern for at least 1 hour. For first-time mothers, most providers recommend calling or heading to the hospital at this point. If it is not your first baby, labor often progresses faster, so the threshold shifts to 4-1-1 or even earlier. Always follow your healthcare provider's specific guidance.
How do I accurately measure contraction duration and frequency at home?
Start timing a contraction the moment it begins and stop when it fully fades — this is the duration. Frequency is measured from the start of one contraction to the start of the next. Use a phone timer or a dedicated app to log each contraction. Tracking at least 6–10 contractions in a row gives you a reliable average for both duration and frequency before entering values into this calculator.
Why does being a first-time mother change when I should go to the hospital?
First-time labors typically progress more slowly because the cervix and birth canal have not previously stretched. This means early labor can last many hours, and going to the hospital too soon may result in being sent home. Subsequent labors tend to move faster, so the criteria for heading in are slightly more lenient. This calculator adjusts its hospital threshold automatically based on whether it is your first baby.