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Pregnancy Due Date Calculator

Calculate your estimated due date (EDD) from last menstrual period (LMP). Trimesters and key milestones.

How EDD is calculated

Your estimated due date (EDD) is your last menstrual period (LMP) plus 280 days (40 weeks). This is Naegele's rule. If your cycle is longer or shorter than the typical 28 days, the calculator adjusts: a 30-day cycle adds 2 days; a 26-day cycle subtracts 2.

Trimesters & milestones

  • 1st trimester — weeks 1–12. First antenatal visit, NHIF maternity activation.
  • 2nd trimester — weeks 13–26. Anomaly scan around week 20.
  • 3rd trimester — weeks 27–40. Delivery prep, hospital choice, leave planning.

Tanzania practicalities

  • Antenatal care is free at most public clinics; NHIF covers private/mission hospitals.
  • NSSF maternity benefit pays 100% of salary for 84 days every 3 years if you have 36 contribution months.
  • Maternity leave — 84 calendar days, paid by NSSF (employer tops up if NSSF rate is below salary).
  • Public hospitals like Muhimbili, KCMC, Bugando, MOI — high-volume, low cost; private like Aga Khan, Regency, Premier Care — higher cost, faster service.

See the Leave Days Calculator for maternity-leave timing and the NHIF Calculator for cover.

Frequently asked questions

Is the Pregnancy Due Date Calculator free?
Yes. Every Tawala tool is free to use, requires no signup, and runs entirely in your browser. We do not log or store any value you enter.
Are the figures up to date for 2026?
Yes. We track changes to TRA rates, statutory contributions and sector tariffs and update affected tools the same week any change is gazetted.
Can I use this on mobile?
Yes — every tool is mobile-friendly and works on any phone with a browser. No app install required.
Where do the formulas come from?
Each calculator is built from primary sources: TRA Acts and Practice Notes, NSSF Act regulations, NHIF tariffs, BoT rates and ministry gazettes. We add a citation and date stamp at the foot of each tool.

Want this automated for your business?

Tawala bundles every Tanzanian tax, payroll and compliance calculation — and files it for you. From TZS 75,000/month.

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