Pregnancy Due Date Calculator

Find your estimated due date, how many weeks along you are, and the healthy weight-gain range for your body.

Example values shown. Replace them with your own.
days
28 days is typical. Longer cycles move the due date later.
For the weight-gain guide (optional)
kg
cm

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How this is worked out

  • Due date from period: Naegele's rule, 280 days after the first day of the last period, adjusted by your cycle length minus 28 days. From conception: 266 days. IVF: 261 days after a day-5 transfer, 263 after a day-3 transfer.
  • Babies rarely arrive on the exact due date. A first-trimester scan is the most accurate way to date a pregnancy, so if your doctor has given you a date from a scan, go by that.
  • Weight gain: ICMR-NIN Dietary Guidelines for Indians (2024), using Indian BMI groups.
  • Glucose test: MoHFW national guideline on gestational diabetes (2018). Scan timings shown are the usual windows; your obstetrician sets the actual schedule.

How your due date is worked out

Doctors count pregnancy from the first day of your last period, not from conception, so a pregnancy is about 40 weeks (280 days) long. If your cycle is longer or shorter than 28 days, the date moves by the difference. If you know the conception date or had IVF, choose that option instead.

Why your date may change after a scan

An early ultrasound measures the baby directly and is the most accurate way to date a pregnancy. If your doctor gives you a date from a scan, go by that one.

Healthy weight gain for Indian women

BMI before pregnancy Advice (ICMR-NIN, 2024)
Below 18.5 (underweight) Eat more and have your weight checked regularly; your doctor sets the target
18.5 to 23 (normal) Gain at least 10–12 kg
23 to 27.5 (overweight) Gain not more than 5–9 kg
Above 27.5 (obese) Gain not more than 5–9 kg

Common questions

My periods are irregular. Will this be accurate?

Less so. With irregular cycles, an early scan gives a far better date. Use this as a rough guide until then.

When is the glucose test done?

India's national guideline (MoHFW, 2018) advises a 75 g glucose test at your first check-up, and again at 24–28 weeks if the first one is normal.

Is anything I type saved?

No. Your dates are worked out on your device. Only if you sign up for updates do we keep your email, number and due date, and only for those messages.

These calculators give general information and are not a diagnosis. Please speak to your paediatrician, gynaecologist or a registered dietitian about any concern. Checked against IAP, ICMR-NIN and MoHFW guidance, October 2026.