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Pregnancy Trimester Calculator — Which Trimester Am I In?

Find out which trimester you're in, current week and day, and how many days until your due date. Includes key milestones for each trimester.

Which trimester am I in?

Current week

10w 0d

Trimester

1

Due in

210 days

Trimester 1

Weeks 1–12

Heart starts beating (week 5–6). Major organs forming. Morning sickness common. First-trimester scan around week 12.

Trimester 2

Weeks 13–27

Anomaly scan (~20 weeks). First movements (16–25 weeks). Sex usually visible. Often the most comfortable trimester.

Trimester 3

Weeks 28–40

Rapid weight gain. Braxton Hicks contractions. Position monitoring. Full-term from week 37.

🌸

Use Due date to compute when baby arrives, Baby age once born, or Period predictor to track cycles.

About this tool

Trimester windows

  • First (weeks 1–12): Major organ formation. Heartbeat starts (week 5–6). Morning sickness common.
  • Second (weeks 13–27): Anomaly scan (~20 weeks). First movements. Sex often visible.
  • Third (weeks 28–40): Rapid weight gain. Braxton Hicks. Full-term from week 37.

How to use the Pregnancy Trimester Calculator

Takes about a minute. No signup, no download, your data stays in your browser.

  1. 1
    Open the tool. Scroll up to the Pregnancy Trimester Calculator above — it loads instantly in your browser, no install needed.
  2. 2
    Enter your values. The fields come pre-filled with realistic defaults so you can see how it works — replace them with your own numbers.
  3. 3
    Read the result. The output updates instantly. Copy or share it — nothing is uploaded to a server, everything stays on your device.

Frequently asked questions

Common questions about the Pregnancy Trimester Calculator.

Is the Pregnancy Trimester Calculator free to use?

Yes. The Pregnancy Trimester Calculatoron 7BusyBoss is completely free — no signup, no paywall, no usage cap.

Do I need to sign up to use the Pregnancy Trimester Calculator?

No. The Pregnancy Trimester Calculatorworks instantly in your browser — no account needed. Signing in with Google is optional and only unlocks features like saving favorites and higher AI build limits.

Does the Pregnancy Trimester Calculator work on mobile?

Yes. Every tool on 7BusyBoss is mobile-responsive and works in any modern browser — Chrome, Safari, Firefox, Edge — on phones, tablets and desktops.

Is my data safe when I use the Pregnancy Trimester Calculator?

Yes. The Pregnancy Trimester Calculatorruns entirely in your browser — your inputs never leave your device unless the tool explicitly fetches public data (e.g. currency rates). We don't store the values you type.

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