FREE FITNESS CALCULATORS

Every number you need to train smarter, eat better, and move faster. 33 free tools across strength training, body composition, nutrition, and endurance. No sign-up. No paywalls. Just the calculations.

33 Free CalculatorsStrength TrainingBody CompositionNutritionRunning

Whether you are calculating your one-rep max to set training percentages, finding your TDEE to structure a cut or bulk, or pacing out a marathon goal, these tools give you the precise numbers that turn general effort into a structured plan. Every calculator is free, built into the page, and requires no account or email. Use them as often as you need.

STRENGTH & LIFTING CALCULATORS

Calculate your one-rep max, program your training percentages with Wendler 5/3/1, and compare your powerlifting performance across weight classes with the Wilks formula.

BODY COMPOSITION CALCULATORS

Measure where you are. BMI, body fat, lean mass, ideal weight, and body type calculators that give you an honest baseline to build from.

BMI Calculator
Metric and imperial body mass index with healthy range reference.
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Body Fat Calculator
Estimate body fat percentage using measurements or the Navy formula.
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Lean Body Mass Calculator
Calculate muscle, bone, and organ mass excluding body fat.
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Ideal Weight Calculator
Multiple formula comparison for your target healthy bodyweight.
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Healthy Weight Calculator
Find your healthy weight range based on height and frame size.
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Body Type Calculator
Identify your somatotype: ectomorph, mesomorph, or endomorph.
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Body Surface Area Calculator
Calculate total skin surface area for clinical and fitness reference.
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Height Calculator
Predict adult height from current measurements and parental height.
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Army Body Fat Calculator
APFT-standard body fat measurement using neck and waist circumference.
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NUTRITION & CALORIE CALCULATORS

Know your numbers before you touch a meal plan. TDEE, macros, protein targets, and calorie burn calculations based on your actual stats and activity level.

YOUR NUMBERS DESERVE THE RIGHT GEAR

Now that you know your 1RM, your body fat, and your daily calorie target, make sure your equipment matches your training. A 10mm lever belt, quality lifting straps, and knee sleeves are not accessories. They are the tools that let you actually execute the numbers you just calculated.

10mm Lever BeltLifting StrapsKnee Sleeves

RUNNING & ENDURANCE CALCULATORS

From 5K pace to marathon finish time, training zones to stride length, these tools cover every number a runner needs to race smarter and train harder.

Pace Calculator
Convert between pace per mile, per km, and finish time for any distance.
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Running Pace Calculator
Advanced pace tool with split calculations for half and full marathons.
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Marathon Pace Calculator
Calculate target marathon pace and projected finish time by goal.
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Training Pace Calculator
Find your easy, tempo, and interval training paces from race times.
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Race Time Improvement Calculator
Predict race time improvement based on increased weekly mileage.
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Stride Length Calculator
Estimate running stride length and cadence from height and pace data.
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Magic Mile Calculator
Jeff Galloway’s magic mile race prediction method for all distances.
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Hiking Time Calculator
Estimate hike duration using Naismith’s Rule with elevation adjustment.
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Calories Burned Biking Calculator
Cycling calorie burn estimate by speed, duration, and bodyweight.
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Target Heart Rate Calculator
Find your aerobic and anaerobic training heart rate zones by age.
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HEALTH & GENERAL CALCULATORS

Heat index, age calculation, and general health reference tools for training in varying conditions and environments.

All calculators use established scientific formulas and are provided for informational purposes. Individual results vary based on measurement accuracy and physiological differences. For clinical health decisions, consult a qualified medical professional.