Health & Fitness Calculators

Health & Fitness Calculators

Free online health and fitness calculators. BMI, BMR, TDEE, macro calculator, calorie calculator, body fat percentage, and 30+ more fitness tools.

How to use this calculator

1. Enter the measurements, dates, times, or units requested in the calculator form.
2. Select the relevant unit, sex, activity, pregnancy, or health context options when the page offers them.
3. Run the calculation and review the numeric result together with the category or explanation.
4. Compare the result with the notes and references on the page, then save or share the result only as an educational estimate.

Formula and interpretation notes

This calculator uses the formula and unit conversions shown on the page, then formats the result for browser-based education and planning.

Example input and output

{
  "tool": "Health & Fitness Calculators",
  "input": {
    "need": "health calculator"
  },
  "output": {
    "output": "directory of medical, fitness, nutrition, and body measurement tools"
  }
}

Glossary

Screening tool

A calculator that flags a possible range or pattern but does not diagnose a disease.

Clinical context

Medical history, symptoms, medicines, lab methods, and physical exam findings that can change interpretation.

Reference range

A published range used for comparison; it may not fit every age, pregnancy status, or medical condition.

Follow-up

A clinician review, repeat measurement, or lab test used to confirm an estimate.

Urgent symptom

A symptom such as chest pain, fainting, severe shortness of breath, confusion, or severe bleeding that needs urgent care.

References and sources

• CDC: Adult BMI Categories
• CDC: Adult Physical Activity Guidelines
• FDA: Spilling the Beans, How Much Caffeine Is Too Much?
• ACOG: Methods for Estimating the Due Date
• NIDDK: Estimated Glomerular Filtration Rate Calculators