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Pregnancy Due Date Calculator
Due date, gestational age and trimester context from one date.
Live math canvas
Your numbers, formula and explanation together
Pregnancy Due Date Calculator: 2027-03-08. 2 weeks 5 days as of 2026-06-20 · first trimester estimate · cycle adjustment +0 days.
Formula applied
The exact method behind this answer
CalculationTime keeps the method visible so the number can be checked instead of blindly trusted.
LMP method: due date = LMP date + 280 days + (cycle length − 28 days). Conception method: conception date + 266 days. IVF method: transfer date + (266 − embryo day) days. Ultrasound method: scan date + (280 − reported gestational age in days).
Apply the formulaLMP method: due date = LMP date + 280 days + (cycle length − 28 days). Conception method: conception date + 266 days. IVF method: transfer date + (266 − embryo day) days. Ultrasound method: scan date + (280 − reported gestational age in days).2027-03-082 weeks 5 days as of 2026-06-20 · first trimester estimate · cycle adjustment +0 days.
Your live breakdown
Current inputs in the calculation
These values come from the controls above and update when the calculator changes.
LMP year
2,026
LMP month
6
LMP day
1
As-of year
2,026
As-of month
6
As-of day
20
Cycle length
28 days
Resulting answer
2027-03-08
2 weeks 5 days as of 2026-06-20 · first trimester estimate · cycle adjustment +0 days.
Answer
2027-03-08
Live support
2 weeks 5 days as of 2026-06-20 · first trimester estimate · cycle adjustment +0 days.
Assumptions used
What this answer assumes
Estimate only; confirm pregnancy dating with a qualified health professional.
This is a conventional estimate only.
Ultrasound dating and clinical advice can change the estimated due date.
Dates are handled as UTC calendar days to avoid timezone drift.
Master’s Tip
How to use the result well
Master’s Tip: treat the due date as an estimate window, not a guaranteed delivery day.
Printable record
What belongs in the saved calculation
Save the inputs, result, formula, assumptions, page URL and date together so the calculation can be reviewed later.
LMP year
2,026
LMP month
6
LMP day
1
As-of year
2,026
Embeddable calculator
Embed this calculator
Copy a clean iframe version with the required CalculationTime attribution link built in.
Explain it like I'm 12
The due date calculator estimates an expected due date and current gestational age from the dating method the user actually has.
LMP method: due date = LMP date + 280 days + (cycle length − 28 days). Conception method: conception date + 266 days. IVF method: transfer date + (266 − embryo day) days. Ultrasound method: scan date + (280 − reported gestational age in days).
Worked example
For an LMP date of 2026-06-01 and 28-day cycle, the estimated due date is 2027-03-08.
Professional note
Master’s Tip: treat the due date as an estimate window, not a guaranteed delivery day.
Regional and unit assumptions
Common 280-day LMP method. Clinical pregnancy dating should be confirmed with a qualified health professional.
Assumptions and limitations
This is a conventional estimate only.
Ultrasound dating and clinical advice can change the estimated due date.
Dates are handled as UTC calendar days to avoid timezone drift.
Methodology & Accuracy
How this calculator is checked
CalculationTime pages are built around visible arithmetic: the formula, assumptions, worked example and practical limitations are shown so the result can be checked rather than simply trusted.
Formula used
LMP method: due date = LMP date + 280 days + (cycle length − 28 days). Conception method: conception date + 266 days. IVF method: transfer date + (266 − embryo day) days. Ultrasound method: scan date + (280 − reported gestational age in days).
Standard or basis
Common 280-day LMP method. Clinical pregnancy dating should be confirmed with a qualified health professional.
Where a calculator follows a named legal, trade or industry standard, that standard is cited visibly. Otherwise the page uses transparent general arithmetic and states its limits.
Master's Tip
Master’s Tip: treat the due date as an estimate window, not a guaranteed delivery day.
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