Health Calculators
Health Calculators — guides, articles and tools from CalcaTools covering every topic in this category. Free, fast, browser-based explainers with no sign-up.
How Many Calories Should You Eat to Lose Weight?
Lose weight by eating below your TDEE. Learn the three-step calculation, a safe 500-calorie deficit for 1 lb/week, protein targets and safe calorie floors.
Ideal Weight for Your Height: Formulas, Charts and How to…
Find your ideal weight using the Devine, Robinson and Miller formulas or the BMI healthy range (18.5-24.9). Includes a height chart and why body composition matters.
Body Fat Percentage: How It’s Measured, Which Metho…
Calipers, BIA, DEXA, Navy formula — they all give different numbers. Here is how each works, which to trust, and what range is actually healthy.
Pregnancy Due Date Calculation: Naegele’s Rule, LMP…
The 40-week due date is an estimate, not a deadline. Here is the math behind it, why it is often a week off, and how the early dating scan corrects…
TDEE Calculator Explained: How to Find Your Real Daily Ca…
Your TDEE is the single most useful number for fat loss, recomp, or muscle gain. Here is how it is calculated, where most calculators get it wrong, and how to…
BMI Categories Explained: What Your Number Actually Means
BMI Categories: What Your Number Really Means You’ve probably done it. You step on the scale, measure your height, and put those numbers into a calculator. It gives you a…
How BMI Is Calculated: The Simple Math Behind the Score
The Simple Math Behind Your Score Visiting a doctor, gym, or dietician? You’ll probably hear about your Body Mass Index (BMI). They weigh you, measure your height, and type in…
Limitations of BMI: Why Your Scale is Lying to You
Why That “Obese” Label Might Be Completely Wrong A few years ago, my friend Dave had a checkup. Dave is super fit. He lifts weights, plays rugby, and has almost…