Compare calculators
Both calculators run independently — change the inputs on either side to compare results.
Health
Pregnancy Due Date Calculator
Estimate your due date and current pregnancy week from how many days ago your last menstrual period started, your average cycle length, and the dating method. A quick projection your OB-GYN will refine with early ultrasound.
Fill in the required fields to see your result.
Fitness
BMI Calculator
Calculate Body Mass Index (BMI) — body weight in kg divided by height in metres squared — to screen for under/overweight categories. The most widely used population-level fitness and health risk metric, with known limitations for athletes and unusual body compositions.
Fill in the required fields to see your result.
Key differences
| Pregnancy Due Date Calculator | BMI Calculator | |
|---|---|---|
| Category | Health | Fitness |
| Inputs required | 4 | 2 |
| Result | Due Date & Current Week | Your BMI |
| What it does | Estimate your due date and current pregnancy week from how many days ago your last menstrual period started, your average cycle length, and the dating method. A quick projection your OB-GYN will refine with early ultrasound. | Calculate Body Mass Index (BMI) — body weight in kg divided by height in metres squared — to screen for under/overweight categories. The most widely used population-level fitness and health risk metric, with known limitations for athletes and unusual body compositions. |