To track contractions, you time two things: how long each one lasts (duration) and how far apart they are (frequency). Duration is measured from the moment you first feel tightening until it fades. Frequency is measured from the start of one contraction to the start of the next, including the rest period in between.
Getting these two numbers right is what helps you distinguish early labor from false alarms, recognize when labor is progressing, and know when it’s time to head to the hospital.
What You’re Actually Measuring
A contraction feels like a wave of tightening across your belly. In early labor, the sensation is typically a dull ache in the lower abdomen, lower back, and sacrum. As labor progresses and delivery gets closer, the pain shifts and becomes sharper, more localized to the pelvis and perineum.
When a contraction starts, note the time. When the tightening fully releases, note the time again. The gap between those two moments is your duration, measured in seconds. Then, when the next contraction begins, measure from the start of the previous one to this new start. That gap is your frequency, measured in minutes. So if a contraction starts at 8:00, ends at 8:01, and the next one starts at 8:05, you had a 60-second contraction with a 5-minute frequency.
What the Pattern Tells You
The pattern matters more than any single contraction. True labor contractions come at regular intervals, get closer together over time, last longer, and grow stronger. Braxton Hicks contractions (the “practice” kind) are irregular, unpredictable, and don’t build in intensity. They may last anywhere from under 30 seconds to 2 minutes, but they lack rhythm. A Braxton Hicks contraction often stops if you change position, walk around, or drink water. True labor contractions continue regardless of what you do.
A simple test: if you can sleep through a contraction, it’s not true labor. If rest and hydration make them go away, they’re not true labor. Real contractions persist and intensify with movement or position changes.
How Contractions Change Through Labor
Early labor is the longest stretch, typically lasting 6 to 12 hours. During this phase, contractions are shorter and spaced further apart, and your cervix dilates to about 6 centimeters. This is the phase where tracking is most useful, because you’re watching for the pattern to tighten and intensify.
Active labor lasts roughly 4 to 8 hours. Contractions come every 2 to 5 minutes and last about 60 to 90 seconds. The cervix finishes dilating to 10 centimeters. By this point, there’s rarely any question about whether you’re in labor.
If you’re giving birth for the first time, expect more intense sensations during early labor compared to someone who has given birth before. Women who have previously delivered often report that pain ramps up more suddenly during the later pelvic phase, as the baby descends quickly.
Methods for Tracking
You have three basic options: a clock or stopwatch with pen and paper, a smartphone app, or a partner who tracks for you. Each has trade-offs.
Pen and paper is straightforward. Create two columns (start time and end time) and a third for notes about intensity. This works well in early labor when contractions are manageable. Many people find, though, that once contractions become strong and close together, holding a pen becomes the last thing they want to do.
Contraction timer apps simplify the process to a single button tap at the start and end of each contraction. The app calculates duration and frequency automatically and displays your pattern visually. Popular options include Freya (which also offers guided breathing exercises) and simple timer apps. The downside is real: when contractions are intense, remembering to tap your phone is surprisingly difficult. People routinely report forgetting to log contractions once pain picks up, or not wanting to hold their phone at all.
The most practical approach for many people is to start tracking yourself and then hand the job to a partner or support person as labor intensifies. Your partner watches the clock, notes when you visibly tense up, and records when you relax. This frees you to focus on breathing and coping.
When Your Pattern Signals It’s Time
A widely used guideline is the 5-1-1 rule: contractions coming every 5 minutes, each lasting at least 1 minute, and maintaining that pattern for 1 hour. This is a common benchmark for calling your provider or heading to the hospital. Hospitals typically admit patients who have regular, strong contractions, cervical dilation of at least 4 to 5 centimeters with documented change, and significant cervical thinning (around 80% or more). Ruptured membranes with contractions also warrant admission.
Your provider may give you a different target depending on your specific situation, your distance from the hospital, or whether this is your first delivery. Follow whatever instructions you received at your prenatal visits, and use your tracked data to describe exactly what’s happening when you call.
Contractions Before 37 Weeks
Tracking becomes especially important if you feel regular tightening before 37 weeks of pregnancy, because this could signal preterm labor. Warning signs include frequent belly tightening, a constant dull low backache, pelvic pressure, mild cramping, vaginal spotting or bleeding, and any fluid leak (watery, bloody, or mucus-filled). If you’re tracking contractions and notice a regular pattern developing before 37 weeks, contact your provider immediately rather than waiting for the pattern to meet any specific rule.
Tips for More Useful Tracking
- Start a log before active labor. Practice timing a few Braxton Hicks contractions in the weeks before your due date so the process feels automatic when it matters.
- Track intensity alongside timing. Use a simple 1-to-10 scale or descriptive words (mild, moderate, strong). This helps you and your provider see the full picture, not just spacing.
- Don’t obsess over every contraction. In very early labor, check in every 30 to 60 minutes rather than staring at a timer nonstop. Resting conserves energy you’ll need later.
- Brief your partner early. Show them how to use whatever tracking method you’ve chosen before labor starts. When contractions get intense, the handoff should be seamless.
- Bring your log to the hospital. Whether it’s on paper or an app screen, your contraction history gives the admitting team concrete data about how your labor has progressed at home.