Due Date Calculator
Estimate your baby's due date from the last menstrual period, conception date, IVF transfer day or an early ultrasound, with current gestational age and key prenatal milestones.
How to use the Due Date Calculator
- Fill in the inputs with your own numbers — every field shows what it expects.
- The result updates instantly as you type; no "Calculate" click needed.
- Read the result card for the main figure, the step-by-step formula, and practical notes.
Frequently asked questions
Is the Due Date Calculator free?
Yes — all health calculators on Calcton are free, with no sign-up required. Your inputs are processed in your browser and never sent to a server.
Is there a Chinese version of this tool?
Yes. Use the Chinese version link above — it is the same calculator with the interface in Simplified Chinese.
References
Formulas and benchmarks used by this calculator follow these published sources.
KevinContent LeadCalcton Editorial Team · Last updated 2026-04-29
Kevin maintains Calcton's formula verification and content: every calculator cites the standard it implements, worked examples are recomputed programmatically, and health benchmarks follow WHO and international guidelines.
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About health calculators
Evidence-based health calculators — BMI, daily calories, body fat, pregnancy due date, heart-rate zones and clinical scores — following international medical standards.