Health & Fitness
Track your wellness journey with BMI, calories, and body composition tools.
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BMI Calculator
Calculate your Body Mass Index (BMI) and understand your weight status
TDEE Calculator
Calculate your Total Daily Energy Expenditure (TDEE) - exactly how many calories you burn per day
Body Fat Percentage Calculator
Estimate body fat percentage for men and women with the US Navy tape method
Macro Nutrient Calculator
Calculate your optimal macronutrient ratios (Protein, Carbs, Fats) for your fitness goals
Pregnancy Due Date Calculator
Estimate a due date from the first day of your last period
Ovulation Calculator
Track your fertility window and find your most fertile days to increase chances of conception
Basal Metabolic Rate Calculator (BMR)
Calculate your Basal Metabolic Rate (BMR) - the number of calories your body burns at rest
All Health & Fitness Calculators
Ideal Weight Calculator
Calculate your ideal body weight range based on multiple scientifically proven formulas
Water Intake Calculator
Calculate how much water you should drink daily based on your weight and activity level
Target Heart Rate Calculator
Calculate your optimal heart rate zones for fat burning, cardio, and peak performance
Due Date by Ovulation
Estimate a due date from an ovulation date or a conception date.
Pregnancy Week Calculator
See how many weeks and days pregnant you are from the first day of your last period.
Pregnancy Weeks to Months
Convert pregnancy weeks and days into a pregnancy month and a trimester.
BAC Calculator
Estimate your Blood Alcohol Content (BAC) based on what you've had to drink
One Rep Max (1RM) Calculator
Estimate your maximum lifting weight for bench press, squat, and deadlift
Pace Calculator
Calculate running pace, finish time, distance, and speed
Smoking Cost Calculator
Calculate how much money you spend on cigarettes over time and the potential savings of quitting
Reverse BMI Calculator
Calculate the weight you need to reach a specific BMI (Body Mass Index) based on your height.
Corrected Calcium Calculator
Calculate corrected calcium levels based on albumin. Critical for patients with hypoalbuminemia.
Prostate Volume Calculator
Estimate prostate volume using TRUS (Transrectal Ultrasound) measurements.
FFMI Calculator
Calculate fat-free mass index and the height-normalized FFMI
Peptide Calculator
Calculate peptide concentration, draw volume, and syringe units from vial size and diluent
Data-Driven Health & Fitness
Health isn't a guessing game. Understanding your body's metrics is key to reaching your fitness goals, whether that's losing weight, building muscle, or just maintaining a healthy lifestyle. Our calculators use proven scientific formulas to give you personalized insights.
Start Here: Key Health Metrics
- Body Composition: Check your BMI and Body Fat Percentage to assess your current status.
- Energy Balance: Find your maintenance calories with the TDEE Calculator.
- Nutrition: Plan your diet with the Macro Calculator.
Worked Examples: Fitness Planning
Scenario 1: Weight Loss Plan
You want to lose 1 lb per week. You are 30, 5'10", 200 lbs, and exercise 3x/week.
- Calculate TDEE (Maintenance): ~2,800 calories/day.
- Subtract 500 calories (for 1 lb/week loss).
- Target: Eat ~2,300 calories/day.
Scenario 2: Understanding BMI
You calculate a BMI of 26.5 ("Overweight").
- Check Body Fat Calculator next.
- If body fat is low (e.g., 12%), the high BMI is due to muscle (Healthy).
- If body fat is high, the BMI accurately reflects health risk.
Pregnancy dates
Due dates on this site are estimates, not medical advice. Start with the pregnancy due date calculator if you know the first day of your last period. If you know ovulation or conception, use due date by ovulation. The pregnancy calculator hub also links the week calculator and the weeks-to-months chart.
Frequently Asked Questions
Is BMI accurate for everyone?
BMI is a general screening tool, not a diagnostic one. It does not distinguish between muscle and fat, so it may classify muscular athletes as overweight. We recommend using it alongside other metrics like body fat percentage and waist circumference.
How many calories should I eat to lose weight?
A safe, sustainable rate of weight loss is 0.5 to 1.0 kg (1-2 lbs) per week. This typically requires a calorie deficit of 500-1000 calories per day below your TDEE. Never drop below 1200 calories (women) or 1500 (men) without medical supervision.
What is TDEE?
TDEE (Total Daily Energy Expenditure) is the total number of calories you burn in a day, including your Basal Metabolic Rate (what you burn at rest) plus calories burned from activity and digestion.