Health calculator hub
Free, practical calculators for BMI, BMR, TDEE, body fat, macros, and more. Use the tools to get a starting estimate, then read guides like How to Estimate Activity Level for TDEE and Common Mistakes When Using TDEE Calculators so you can interpret the number more carefully.
Body Tally gives you fast, free health and fitness estimates in plain language. Use the calculators to explore body composition, energy needs, nutrition targets, hydration, running pace, and strength planning, then read the guide sections to understand what each result can and cannot tell you.
People tracking wellness, learning fitness math, planning nutrition, comparing body composition estimates, or organizing training numbers.
A single number rarely explains everything. Body Tally links related calculators and guides so you can see the next layer of context.
Results are educational estimates, not medical advice. Use them to learn and prepare better questions for qualified professionals.
Last updated: May 27, 2026 | Edited by Body Tally Team
Current search demand is clustering around activity level, TDEE, and calorie planning. These pages help you move from a raw estimate to a more realistic plan.
Before you trust a TDEE number, use examples and multiplier guidance to choose a more realistic activity setting.
Read the activity-level guideUse TDEE, calorie targets, and macro guidance together so the estimate becomes something you can test in real life.
Open the Calorie CalculatorLearn how the formulas work, when to question them, and when a calculator result should lead to professional advice instead of a quick decision.
See how Body Tally calculators workSelect from our collection of health and fitness calculators to get started
Calculate your Body Mass Index and healthy weight range
Find your Basal Metabolic Rate using Mifflin-St Jeor equation
Calculate Total Daily Energy Expenditure based on activity level
Plan your daily calorie target for weight goals
Calculate protein, fat, and carb targets for your diet
Estimate body fat percentage using US Navy method
Find your ideal weight using multiple formulas
Calculate your lean body mass and muscle weight
Assess health risk using waist-to-height ratio
Calculate running or walking pace per mile or kilometer
Estimate your one-rep max for strength training
Calculate daily water intake based on weight and activity
Our calculators use commonly referenced formulas to provide health and fitness estimates. Results are for educational purposes and should not replace professional medical advice. Individual results may vary based on genetics, lifestyle, medications, and other factors. Always consult a qualified healthcare provider for personalized guidance.
If you are using Body Tally for maintenance calories, fat loss planning, or macro setup, these are the best pages to read first.
Calories
Choose a more realistic activity level when using calorie and TDEE calculators.
Calories
Learn how to pick an activity multiplier without overestimating maintenance calories.
Calories
Avoid the most common reasons maintenance calorie estimates end up too high, too low, or too inconsistent to use.
Calories
Compare resting calorie estimates with total daily energy expenditure for better calorie planning.
Calories
Learn what a calorie deficit means and why moderate, trackable changes are usually more useful.
Calories
Compare how calorie targets usually differ for maintaining weight, losing fat, or supporting muscle gain.
The safest pattern is simple: use a calculator, read the matching guide, compare the result with one related tool, then decide whether the number is only a useful estimate or something that deserves professional follow-up.
Use the calculator to estimate a health or fitness number, then compare it with trends over time and other relevant context.
These tools are for education and planning. They do not replace medical advice.
Our calculators use commonly referenced formulas like Mifflin-St Jeor for BMR and the US Navy method for body fat. They provide estimates based on population averages. Individual results may vary due to genetics, muscle mass, medications, routine changes, and other factors. For personalized advice, consult a healthcare professional.
Both systems are equally accurate. Choose the unit system you are most comfortable with. All calculators that support both units allow you to toggle between metric (kg, cm) and US (lbs, inches) measurements.
No. These calculators are educational tools only and should not replace professional medical advice. Always consult a qualified healthcare provider for diagnosis, treatment, or medical decisions.
No. All calculations happen in your browser. We do not collect, store, or transmit your personal health data to our servers. Your privacy is important to us.
For calorie planning, start with the TDEE Calculator and then read the activity-level and TDEE guides. For general body-size context, start with BMI Calculator. For nutrition planning, use the Calorie Calculator and Macro Calculator together.