SelHealth Calculators

Due Date Calculator

Use the Due Date Calculator on SelHealth for a fast, clear reading with practical interpretation.

How to use this tool
  1. Enter the requested information in the tool.
  2. Run the calculation or continue to the result.
  3. Review the result summary and interpretation.
🌸 Women's Health
SelHealth dark calculator system

Ovulation Calculator

Estimate your ovulation day and fertile window based on your last period and cycle length.

Cycle-based Fertility window
Educational Tool Medically reviewed • Last reviewed: 2026-03 • Source: Cycle-based fertility education • Evidence level: Reference-based educational estimate
Ovulation timing here is an educational cycle-based estimate and becomes less reliable with irregular cycles, postpartum changes, or PCOS.
Choose a date from the calendar or type it as month/day/year.

Due Date Calculator

Estimate the due date based on the first day of your last menstrual period.

LMP-based Estimate
Educational Tool Medically reviewed • Last reviewed: 2026-03 • Source: Naegele rule • Evidence level: Reference-based educational estimate
LMP-based due date is an educational estimate; early first-trimester ultrasound is often more accurate.
Choose a date from the calendar or type it as month/day/year.

Fetal Growth Overview

An educational gestational-age overview with approximate development values. It does not replace ultrasound or clinical assessment.

Pregnancy stage Estimate
Educational Tool Medically reviewed • Last reviewed: 2026-03 • Source: ACOG pregnancy growth overview / ultrasound context • Evidence level: Reference-based educational estimate
These development values are approximate educational references and do not replace ultrasound biometry, dating, or obstetric assessment.

Pregnancy Nutrition

Get a simple educational nutrition guide based on your pregnancy stage.

Pregnancy stage Educational
Educational Tool Medically reviewed • Last reviewed: 2026-03 • Source: ACOG / prenatal nutrition guidance • Evidence level: Reference-based educational estimate
This guide provides trimester-level educational priorities and does not replace individual prenatal nutrition counseling.

Pregnancy Weight Gain

Estimate a healthy pregnancy weight gain range based on your pre-pregnancy BMI.

Singleton pregnancy Estimate
Educational Tool Medically reviewed • Last reviewed: 2026-03 • Source: ACOG / IOM • Evidence level: Guideline-framed screening support
Educational pre-pregnancy BMI–based target ranges for singleton pregnancy; they do not replace individualized prenatal counseling.
Safety notes:
  • Weight-gain targets differ with twins and special medical situations.

PCOS Referral Screen

Educational referral screen using Rotterdam-style domains. Not a diagnosis.

Screening only Not diagnostic
Screening Tool Medically reviewed • Last reviewed: 2026-03 • Source: International PCOS Guideline • Evidence level: Guideline-framed screening support
Referral-oriented screening support only; not a diagnostic tool.
Safety notes:
  • This is a referral screen only and does not diagnose PCOS.
  • In adolescents, ultrasound or AMH alone should not be used to diagnose PCOS.

Breast Cancer Risk Factors

An educational review of common breast-cancer risk factors. This tool is not the Gail/BCRAT model and does not estimate absolute risk.

Risk review Educational
Educational Tool Medically reviewed • Last reviewed: 2026-03 • Source: USPSTF screening context / educational factor review • Evidence level: Guideline-framed screening support
This tool reviews factor burden only. It is not the Gail/BCRAT model, does not estimate absolute breast cancer risk, and does not replace routine screening guidance.
Safety notes:
  • This tool does not replace routine screening guidance or hereditary-risk assessment when indicated.

Postpartum Mood Screen

A 10-item postpartum mood screen informed by EPDS structure with a clear safety alert. Screening and follow-up support only, not a diagnosis.

Screening only Last 7 days
Screening Tool Medically reviewed • Last reviewed: 2026-03 • Source: Postpartum mood screening (EPDS-informed) • Evidence level: Guideline-framed screening support
This tool is an EPDS-informed postpartum mood screen for education and triage support. It is not the official EPDS instrument or a stand-alone diagnosis. Any positive self-harm response needs same-day support.
Safety notes:
  • Any positive self-harm response postpartum needs urgent support.
What this tool helps you do

Due Date Calculator helps you estimate your result quickly inside the SelHealth experience, with clear guidance on what the numbers mean and how to use them practically.

How to read your result

Read the result in your own context

This reading is educational and may need wider clinical context if you have symptoms or concerns.

Frequently asked questions
What does the Due Date Calculator do?

It gives you a quick reading with short interpretation inside the SelHealth experience.