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Due Date Calculator

Estimate Due Date Calculator with transparent formulas and readable defaults.

Inputs

Results

Results appear here after you calculate. Numbers use tabular formatting for easy scanning.

How this calculator works

Formulas

Details

Schedule / breakdown

Explanation

Formulas

Assumptions

Estimates only — not financial, medical, or legal advice. Report an issue

Use the CalcAtlas Due Date Calculator to explore inputs, view methodology notes, and export results when available.

Explanation

  • This health calculator produces a screening estimate from body measurements or activity inputs.
  • Results are computed from the values you entered using published formulas for this tool.
  • Key outputs — Estimated Due Date: 2026-10-22.
  • Review the formulas and assumptions below before using these figures for decisions.

Formulas

  • Naegele’s rule: LMP + 280 days (40 weeks).

Assumptions & limitations

  • Outputs are screening estimates for general education, not a diagnosis or treatment plan.
  • Individual medical advice requires a licensed clinician.
  • Ultrasound dating overrides LMP in clinical care.
CalcAtlas methodology

This health calculator produces a screening estimate from body measurements or activity inputs. Results are computed from the values you entered using published formulas for this tool. Key outputs — Estimated Due Date: 2026-10-22. Review the formulas and assumptions below before using these figures for decisions.

Naegele’s rule: LMP + 280 days (40 weeks).

Outputs are screening estimates for general education, not a diagnosis or treatment plan. Individual medical advice requires a licensed clinician. Ultrasound dating overrides LMP in clinical care.