Free Fitness Calculators

FitnessToday – Free TDEE, BMI, Macro & AI Personal Trainer | Fitness Calculators 2026
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Free Fitness Calculators
& AI Personal Trainer

TDEE, BMI, Macros, Body Fat, Protein, 1RM & Water Intake — all in one place.
Trusted by 50,000+ Americans who got real results.

50K+Americans trust us
8free calculators
4.98★coaching rating
2,500+coached clients
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Why FitnessToday Exists

We Were Confused by Fitness.
So We Built the Clarity We Wished We Had.

It started with a question most of us have asked: “How many calories should I actually eat?” Not a generic answer from a forum — a real, personalized number.

We searched. We found tools buried in ads, requiring signups, giving contradictory results. So in 2022, a team of certified trainers, dietitians, and developers built what we wished existed.

“Fitness isn’t about punishment. It’s about having the right information, the right tools, and someone in your corner. We built all three — for free.”

Today, FitnessToday serves 50,000+ Americans every month with 8 science-backed calculators and Coach FT — our AI personal trainer, available 24/7.

01

Calculate Your Numbers

Find your TDEE, macros, body fat % and more — personalized in seconds.

02

Ask Coach FT

Our AI trainer explains what your numbers mean and what to do next.

03

Get a Real Coach

Book a free consultation with a certified personal trainer.

No gimmicks. No subscriptions. Just real fitness science, free.

🧮 Free Fitness Calculators

⚡

TDEE Calculator

Total Daily Energy Expenditure
📊

BMI Calculator

Body Mass Index
🥗

Macro Calculator

Protein · Carbs · Fat
📏

Body Fat %

US Navy Method
💪

Protein Calculator

Daily protein needs
🏋️

One Rep Max

Estimate your 1RM
🎯

Ideal Weight

Devine formula
💧

Water Intake

Daily hydration needs
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🔥 Ultimate Fitness Blueprint 2026

120+ page PDF guide trusted by 10,000+ Americans. Instant download.

  • 12-week progressive workout plan (home + gym)
  • Complete meal plans with grocery lists
  • Form guides with injury prevention tips
  • Evidence-based supplement guide
  • Progress tracking templates & logs
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❓ Frequently Asked Questions

A TDEE (Total Daily Energy Expenditure) calculator estimates the total calories your body burns per day using the Mifflin-St Jeor equation, based on age, sex, weight, height, and activity level. It’s the most accurate way to set your calorie target for fat loss, maintenance, or muscle gain.
BMI uses height and weight for a quick screening number. It doesn’t account for muscle mass — athletes often read “overweight” despite being lean. Use BMI as a starting point and pair it with our body fat % calculator for a full picture.
First calculate your TDEE, then subtract 300–500 calories. Use our macro calculator with “Fat Loss” mode — it sets protein high to preserve muscle, with moderate carbs and fat. A good starting split is 40% protein / 30% carbs / 30% fat.
For muscle gain, 0.7–1g of protein per pound of body weight is the evidence-based target. For fat loss, 0.8–1g/lb helps preserve lean muscle while in a calorie deficit. Use our protein calculator for your personalized daily target.
Coach FT is powered by Claude AI and trained on fitness and nutrition science. It answers questions about workout programming, nutrition strategy, supplements, form tips, and more — 24/7 and completely free. For medical concerns, always consult a physician.
Yes — all 8 calculators and the AI trainer are 100% free. No account, no email, no subscription required. We’re supported by advertising, which lets us keep everything free for 50,000+ monthly users.
Ask Coach FT anything 💬