Home / Calculators / Early pregnancy / Gestational age
Every calculator in one place, free and with no sign-up. Results show instantly — we don't hide them behind a form. Each one explains what the number means, where the reference ranges come from, and what it cannot tell you.
A calculator sees three or four figures. A specialist sees your history, your scans, your partner's results, and how you actually responded to treatment. If you're between cycles, changing clinics, or something in your results doesn't add up, a second opinion is the fastest way to find out whether anything would be done differently.
Free first consultation. No obligation to start treatment, and it doesn't affect your care at your current clinic.
These tools provide general information and are not a diagnosis or a substitute for assessment by a qualified clinician. Reference ranges and sources are stated on each calculator. Predictive estimates describe groups of people and cannot predict an individual outcome.
A calculator sees three or four figures. A specialist sees your history, your scans, your partner's results, and how you actually responded to treatment. If you're between cycles, changing clinics, or something in your results doesn't add up, a second opinion is the fastest way to find out whether anything would be done differently.
Free first consultation. No obligation to start treatment, and it doesn't affect your care at your current clinic.
Weeks and days pregnant after IVF. Part of the due date calculator.
Date calculationExact arithmetic on the dating convention named below. Scan dating by your clinic takes precedence.
How far along a pregnancy is, counted from the first day of the last menstrual period rather than from conception.
Source — Counted from the first day of the last menstrual period, assuming ovulation around day 14. If your cycle is longer or shorter than 28 days, this over- or under-estimates. Ultrasound dating in the first trimester is more accurate and is what maternity care uses.
The bands on this page are drawn from published sources but have not yet been reviewed by our medical team, and some vary by laboratory or assay. Check against the reference range printed on your own report.
From the first day of the last period
That falls in the first trimester band.
Your result of 8.6 weeks sits in the highlighted band. Bands are reference points used alongside clinical findings — not a diagnosis.
Up to 13 weeks. Miscarriage risk falls substantially once a heartbeat is seen on ultrasound.
Counted from the first day of the last menstrual period, assuming ovulation around day 14. If your cycle is longer or shorter than 28 days, this over- or under-estimates. Ultrasound dating in the first trimester is more accurate and is what maternity care uses.
Highlighted is the stage this measurement belongs to. It is a map of the process, not a schedule — timings vary by protocol and by clinic.
Because the date of the last period is usually known and the date of conception usually is not. It adds roughly two weeks compared with counting from conception.
Less so. Longer cycles mean later ovulation, so this will overestimate how far along you are. A dating scan resolves it.
A calculator sees three or four figures. A specialist sees your history, your scans, your partner's results, and how you actually responded to treatment. If you're between cycles, changing clinics, or something in your results doesn't add up, a second opinion is the fastest way to find out whether anything would be done differently.
Free first consultation. No obligation to start treatment, and it doesn't affect your care at your current clinic.
Dating from the last period assumes ovulation around day 14. A first-trimester scan is more accurate. Nothing here is a diagnosis or a substitute for assessment by a clinician.
A calculator gives you a number. These explain what it means, and what it does not.
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