bumpcalculator.com Start Calculating

Contraction Timer

A free online contraction timer — track the frequency and duration of your contractions and know when it's time to call your provider.

00:00

Since last contraction

Avg frequency
last 6, start to start
Avg duration
last 6
Last hour
0
contractions

History

No contractions recorded yet. Press “Start Contraction” when one begins.

Saved only in your browser. This tool is not a medical device — if you're unsure or worried, call your provider or emergency services.

How to Time Contractions

Timing contractions sounds simple, but there's one detail that trips almost everyone up: frequency is measured from the start of one contraction to the start of the next — not from the end of one to the beginning of the next. If a contraction starts at 2:00, lasts one minute, and the next one starts at 2:05, your contractions are five minutes apart, even though you only had four minutes of rest in between.

Duration is the length of a single contraction, measured from the moment it begins to the moment it fully eases. Press start when you first feel your belly tighten and the wave of pressure or cramping begin, and press stop when it has completely released. Early labor contractions often last 30–45 seconds; as labor progresses they typically stretch to 60–90 seconds.

This timer handles both measurements for you. Every time you tap the button it records the timestamp, calculates the gap since the previous contraction started, and builds a running picture of your pattern. That pattern — not any single contraction — is what tells you where you are. You don't need to time every contraction all day long. Time a batch of five or six in a row every so often; if the pattern is clearly changing, time more often.

The 5-1-1 Rule Explained

The 5-1-1 rule is the guideline most commonly given to first-time parents for when to call the provider or head to the hospital or birth center:

The one-hour part matters as much as the other two. Contractions can cluster for twenty minutes and then fade, especially in early labor. A pattern that holds steady for a full hour — or keeps intensifying — is a much more reliable signal that active labor is underway.

Keep in mind that 5-1-1 is a starting point, not a universal rule. Labor often moves faster in second and later pregnancies, so many providers advise 4-1-1 or even 3-1-1 for people who have given birth before. If you live far from your hospital, have a planned cesarean, are carrying twins, or have any risk factors, your provider may want to hear from you earlier. Whatever threshold your own provider gave you overrides anything on this page.

True Labor vs. Braxton Hicks

From the second trimester onward, many people feel Braxton Hicks contractions — sometimes called "practice contractions." They can feel surprisingly strong, but they behave very differently from true labor, and timing them is often the fastest way to tell the two apart:

True labor Braxton Hicks
Pattern Regular, getting closer together Irregular, no clear rhythm
Strength Steadily stronger over time Stays about the same or fades
Duration 30–90 seconds, lengthening Variable, often short
Movement & rest Continue no matter what you do Often ease with position change, walking, rest or water
Location Often start in the back and wrap around to the front Usually felt only at the front of the belly

If you're unsure which you're feeling, try changing what you're doing: drink a glass of water, lie down on your side, or take a short walk. Braxton Hicks contractions usually settle; true labor keeps building. And when in doubt, call — labor and delivery nurses answer this exact question all day long, and no one will mind.

When to Call Your Provider Immediately

Some situations shouldn't wait for a 5-1-1 pattern. Call your provider right away — or contact emergency services if you can't reach them — if any of the following happens:

What to Do in Early Labor

Early (latent) labor — when contractions are still irregular or more than five minutes apart — can last hours, sometimes a day or more, especially with a first baby. For most low-risk pregnancies, this stage is best spent at home, where you can move freely and rest in your own space. A few things genuinely help:

When your pattern reaches the threshold your provider gave you — or any of the immediate-call situations above occurs — it's time to pick up the phone. Until then, breathe, rest, and let this timer keep track of the numbers for you.

Frequently Asked Questions

How do I time contractions correctly?

Press start when a contraction begins (when you first feel your belly tighten) and stop when it fully eases. Duration is measured from the start to the end of one contraction. Frequency is measured from the start of one contraction to the start of the next — not from the end of one to the start of the next.

What is the 5-1-1 rule?

The 5-1-1 rule is a commonly used guideline for when to head to the hospital or birth center: contractions coming about every 5 minutes, each lasting about 1 minute, sustained for at least 1 hour. Some providers advise 4-1-1 or even 3-1-1, especially for people who have given birth before, so always follow the specific guidance your own provider has given you.

How can I tell true labor from Braxton Hicks contractions?

True labor contractions become progressively longer, stronger and closer together, follow a regular pattern, and continue no matter what you do. Braxton Hicks contractions are usually irregular, do not get stronger over time, and often ease when you change position, walk, rest or drink water. Timing them with this tool makes the pattern — or lack of one — easy to see.

When should I call my provider or go to the hospital?

Call when your contraction pattern reaches the threshold your provider gave you (often 5-1-1). Call immediately — regardless of contraction timing — if your water breaks, you have vaginal bleeding, you notice reduced fetal movement, you are less than 37 weeks pregnant and having regular contractions, or something simply feels wrong. If you cannot reach your provider and are worried, contact emergency services.

Does this contraction timer store my data?

Your contraction history is saved only in your own browser (localStorage) so an accidental refresh does not lose it. Nothing is sent to a server, and clearing the timer or your browser data removes it completely.

Sources

More Pregnancy Tools

Free tool

Due Date Calculator

Estimate your due date based on LMP or conception date.

Open →

Free tool

Wake Windows Calculator

Build a newborn nap and sleep schedule.

Open →

Free tool

Baby Growth Percentile

Track your newborn on WHO & CDC growth charts.

Open →