Pregnancy & Baby Calculator Pack
A 6-step chain from conception to feeding: ovulation, due date, pregnancy weight, milk intake and formula prep.
Pregnancy and infancy run on daily numbers: ovulation timing, due-date countdown, weight-gain targets at each checkup, and milk intake per kilogram of body weight.
6 tools · follow the steps
Use in this order
- 1Ovulation CalculatorOvulation day and fertile window from cycle length
Step 1 · Ovulation window
Estimate ovulation and the fertile window from cycle length.
- 2Pregnancy Due Date CalculatorDue date, gestational week and trimesters
Step 2 · Due date
Due date and gestational age from LMP or conception — the anchor of every checkup.
- 3Pregnancy Weight Gain CalculatorRecommended gain vs actual — IOM guidelines
Step 3 · Pregnancy weight
Weight-gain ranges by pre-pregnancy BMI to check at every visit.
- 4Baby Milk Intake CalculatorDaily milk volume and feeding frequency by age
Step 4 · Milk intake
Daily and per-feed milk by body weight — know if feeding is on track.
- 5Baby Formula CalculatorDaily formula volume from baby weight, scoops per day and how long a 900g can lasts.
Step 5 · Formula prep
Precise water-to-powder ratios — avoid the concentration mistakes.
- 6Sleep CalculatorSleep duration, bedtime and wake-up planning
Step 6 · Sleep check
Sleep duration and timing for parent and baby alike — take care of yourself too.
Related Guides
Due Date Calculator: Naegele's Rule & Trimester Guide
Due date = first day of last period + 280 days (40 weeks). Naegele: LMP + 1 year − 3 months + 7 days. Only ~4-5% deliver on the exact date; 37-42 weeks is the normal window. Covers IVF dating, ultrasound adjustment and week-by-week milestones.
Read guide →
Pregnancy Weight Gain: IOM Ranges by BMI
IOM targets: underweight BMI<18.5 → 12.5-18kg; normal 18.5-24.9 → 11.5-16kg; overweight 25-29.9 → 7-11.5kg; obese ≥30 → 5-9kg. Twins: 17-25kg. Distribution: ~1-2kg in trimester 1, then ~0.4kg/week. Where the weight goes, trimester tables and safe management.
Read guide →
Sleep Cycles: Best Bedtime Calculator & 90-Minute Rule
Sleep runs in ~90-minute cycles; waking mid-cycle causes grogginess. For a 7:00 wake time, fall asleep at 23:30 (5 cycles) or 22:00 (6). Add 10-20 min to fall asleep. Covers cycle math, sleep hygiene, and why 6h20m of in-time sleep beats 8 hours of badly-timed sleep.
Read guide →
BMI Standard Ranges: Formula, Tables & Limitations
BMI = weight(kg) ÷ height(m)². Chinese standard: 18.5–23.9 normal, 24–27.9 overweight, ≥28 obese. WHO uses 25/30 cutoffs. Includes full classification tables, examples at common heights, and why muscular people and the elderly should read BMI with caution.
Read guide →
FAQ
How accurate is the due date?
Only ~5% of babies arrive on the day; 37–42 weeks is full term. Treat it as an anchor for checkups, not a forecast.
How much weight gain in pregnancy?
Depends on pre-pregnancy BMI: ~12.5–18 kg if underweight, 11.5–16 normal, 7–11.5 overweight. Check your range above.
How much milk per day?
About 150 ml/kg/day in infancy (cap ≈ 1,000 ml), split across feeds. Compute precisely by weight above.