# NestCalc - Complete Pregnancy Calculator Reference

Free pregnancy calculators: due date, ovulation, conception date, trimester timeline, weight gain, kick counter, and contraction timer. Medically accurate formulas, instant results.

Last updated: 2026-08-11T06:48:57.201Z

## Due Date Calculator
Calculate your estimated due date (EDD) using Naegele's Rule.
- Input: Last menstrual period (LMP) date OR conception date
- Method: LMP + 280 days (40 weeks) or Conception + 266 days (38 weeks)
- Also shows: Current gestational age, trimester, weeks remaining
- URL: https://baby.thicket.sh/due-date

## Ovulation Calculator
Predict your fertile window and most likely ovulation day.
- Input: First day of last period, average cycle length
- Method: Ovulation typically occurs 14 days before next expected period
- Shows: 6-day fertile window, peak fertility days, next 3 cycles
- URL: https://baby.thicket.sh/ovulation

## Conception Date Calculator
Estimate when conception most likely occurred.
- Input: Due date OR birth date, cycle length
- Method: Reverse Naegele's Rule — due date minus 266 days
- Shows: Estimated conception date, possible range (+/- 5 days)
- URL: https://baby.thicket.sh/conception

## Trimester Timeline
Visualize your full pregnancy timeline with key milestones.
- Input: Due date or LMP
- Shows: First trimester (weeks 1-12), second (13-27), third (28-40)
- Milestones: First heartbeat, gender reveal possible, viability, full term
- URL: https://baby.thicket.sh/trimester

## Pregnancy Weight Gain Calculator
Track recommended weight gain based on pre-pregnancy BMI.
- Input: Pre-pregnancy weight, height, current week
- Method: IOM 2009 guidelines by BMI category
- Categories: Underweight (28-40 lbs), Normal (25-35), Overweight (15-25), Obese (11-20)
- URL: https://baby.thicket.sh/weight-gain

## Kick Counter
Track and time your baby's movements.
- Purpose: Monitor fetal movement patterns (recommended from week 28)
- Method: Count time to reach 10 movements
- Alert: If fewer than 10 movements in 2 hours, contact provider
- URL: https://baby.thicket.sh/kick-counter

## Contraction Timer
Time contractions to know when to head to the hospital.
- Tracks: Duration of each contraction, time between contractions
- 5-1-1 Rule: Contractions 5 minutes apart, lasting 1 minute, for 1 hour = go to hospital
- URL: https://baby.thicket.sh/contraction-timer