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Pregnancy Due Date Calculator

Estimate a pregnancy due date from the last menstrual period or conception date.

Reviewed July 26, 2026 Runs locally No sign-up
Global clinical estimateHealth screening estimate
=Your result will appear here

Enter values and calculate.

APPLICABILITY

Where this result fits

Region
Global clinical estimate · NHS and ACOG references
Result type
Health screening estimate
Standards basis
NHS — Pregnancy due date calculator; ACOG — Methods for Estimating the Due Date
Edition / version
ACOG Committee Opinion No. 700 (May 2017) and NHS guidance reviewed July 26, 2026

Important: Pregnancy dating must be confirmed by a qualified prenatal clinician. Do not use this estimate to delay urgent medical care. Medical disclaimer

STEP BY STEP

How to use the Pregnancy Due Date Calculator

  1. Choose last menstrual period or conception date.
  2. Enter the best available date.
  3. Calculate the estimated due date and current gestational age.
  4. Confirm dating with a qualified prenatal clinician.

ACCURACY & LIMITS

What to know before using the result

HELP

Frequently asked questions

How accurate is the Pregnancy Due Date Calculator?

The calculator uses the formula shown on this page and keeps full numeric precision internally before formatting the result. NHS and ACOG guidance treat calendar due dates as estimates; cycle length, assisted reproduction, ultrasound dating, and clinical history can change the date used in care.

Does the Pregnancy Due Date Calculator upload my input?

No. The calculation or processing runs locally in your browser. UtiliNest does not receive or store the values you enter.

Can I use the Pregnancy Due Date Calculator on a phone?

Yes. The inputs, result controls, and explanatory content are designed for current mobile and desktop browsers.

Where does the Pregnancy Due Date Calculator apply?

Applicability: Global clinical estimate, NHS and ACOG references. Result classification: Health screening estimate. Pregnancy dating must be confirmed by a qualified prenatal clinician. Do not use this estimate to delay urgent medical care.

SOURCES

Definitions and references

Reviewed against the references below on July 26, 2026. Links open the source publisher's website. Read the source policy

NHS — Pregnancy due date calculatorACOG — Methods for Estimating the Due Date

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