Calculate exactly what you need with our free Pregnancy Due Date Calculator. Calculate estimated due date based on last period. Join thousands of users...
Formula
const dueDate = (inputs.dayOfYear + 280) % 365; return { dueDate };First Day of Last Period (Day of Year)
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Use the result to compare providers, request quotes, or send the scenario to a specialist when the numbers matter.
Pregnancy Due Date Calculator calculates Estimated Due Day of Year using First Day of Last Period (Day of Year). Individual health metrics and medical costs vary. Use this for general wellness tracking and planning — consult your doctor or healthcare provider before making medical, diet, or fitness decisions based on calculator results.
Use this health calculator to compare scenarios before committing money, time, or a provider conversation.
The estimate combines First Day of Last Period (Day of Year) and returns Estimated Due Day of Year.
If the result changes your decision, verify the current quote, rate, eligibility rule, or provider term before acting.
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This calculator provides general estimates for informational purposes. It is not a substitute for professional medical advice, diagnosis, or treatment. Consult a healthcare provider before making health-related decisions.
Reviewed by the CalculateThis.ai editorial team. Updates: check back for latest parameters. Tools are for estimation only — verify with current provider terms.