Compare calculators

Both calculators run independently — change the inputs on either side to compare results.

Ovulation & Fertility Calculator

Predicts how many days until ovulation and your fertile window from how many days ago your last period started, your cycle length and luteal phase — and can project a later cycle.

Days Since Last Period Started (days)

Average Cycle Length (days)

Luteal Phase Length (days)

Cycles to Predict

Fill in the required fields to see your result.

Pregnancy

Pregnancy Weight Gain Calculator

Estimates how much weight you should have gained by a given week of pregnancy based on your pre-pregnancy BMI, using IOM-aligned weekly rates. Use it to check whether your current gain is on pace with clinical guidelines.

Pre-pregnancy Weight (kg)

Height (cm)

Current Week (weeks)

Fill in the required fields to see your result.

Key differences

	Ovulation & Fertility Calculator	Pregnancy Weight Gain Calculator
Category	Pregnancy	Pregnancy
Inputs required	4	3
Result	Ovulation Prediction	Recommended weight gain (kg)
What it does	Predicts how many days until ovulation and your fertile window from how many days ago your last period started, your cycle length and luteal phase — and can project a later cycle.	Estimates how much weight you should have gained by a given week of pregnancy based on your pre-pregnancy BMI, using IOM-aligned weekly rates. Use it to check whether your current gain is on pace with clinical guidelines.