Army Body Fat Calculator - Estimate body fat percentage using the official US Army tape-test method with neck, waist, and hip circumference measurements per AR 600-9.

Bench Press Calculator - Calculate your one-rep maximum (1RM) for bench press using Brzycki, Epley, or Lander formulas. Get personalized training zones, percentage charts, and strength level assessment.

BMR Calculator - Calculate your BMR (basal metabolic rate) and daily calorie needs with the Mifflin-St Jeor and Harris-Benedict equations. Includes TDEE, activity-level breakdown, macronutrient estimates, and step-by-step formula walkthrough.

Body Fat Percentage Calculator - Calculate your body fat percentage using the US Navy Method with visual body composition breakdown, fitness category assessment, and personalized health recommendations.

Body Recomposition Calculator - Plan calorie and macro targets for simultaneous fat loss and muscle gain. Get a personalized Recomp Feasibility Score, training-day vs rest-day calorie cycling schedule, protein-prioritized macros, and 12 / 24 / 52 week fat-loss and muscle-gain projections based on your training experience. New

Calorie Burned Calculator - Calculate calories burned during 50+ activities with MET values, personalized insights, food equivalents, and interactive visualization. Supports metric and imperial units.

Calorie Deficit Calculator - Calculate your personalized calorie deficit, TDEE, and BMR to create an effective weight loss plan with meal suggestions and progress tracking.

Cycling Speed Calculator - Calculate your cycling average speed, ride time, or distance. Get pace per km/mile, cycling zone classification, calorie estimates, and comparisons with different riding styles.

Hydration Calculator - Calculate exactly how much water and electrolytes you need before, during, and after a workout. Pick an activity, duration, body weight, intensity, and environment, or measure your real sweat rate by weighing yourself before and after. Returns a minute-by-minute drinking schedule, sodium target, dehydration risk gauge, animated sweat-loss visual, and bottle-count guidance for any session length. New

Marathon Pace Calculator - Plan your marathon or half-marathon with target pace, mile/km splits, pacing strategies (negative, positive, even), equivalent race times, and wall prediction.

Max Heart Rate Calculator - Calculate your maximum heart rate using 6 scientifically-validated formulas including Tanaka, Gulati, and traditional methods. Get personalized training zones for optimal workout intensity.

One Rep Max (1RM) Calculator - Calculate your one-rep maximum (1RM) using 7 scientific formulas. Get training zone percentages, warm-up sets, and visualize your strength potential for any exercise.

Pace to Calories Calculator - Convert a running, walking, hiking, or treadmill pace into calories burned using ACSM physiological equations. Enter pace as MM:SS per mile or kilometer, pick distance or duration, optionally add an incline, and instantly see total calories, net vs gross burn, pace-zone classification, equivalent foods, and an animated runner that moves at your pace. New

Pace Zone Calculator - Calculate your personalized training pace zones based on a recent race result using the Jack Daniels VDOT method. Get Easy, Marathon, Threshold, Interval, and Repetition zone paces with targeted workout suggestions.

Protein Intake Calculator - Calculate your optimal daily protein intake based on body weight, fitness goals, and activity level. Get personalized recommendations with per-meal breakdowns, food source suggestions, and evidence-based protein guidelines.

Running Pace Calculator - Calculate your running pace, finish time, or distance. Features pace zone classification, speed conversion, projected race times, and training tips for 5K, 10K, Half Marathon, Marathon, and Ultra distances.

Steps to Distance Calculator - Convert your walking or running steps into miles or kilometers. Estimate stride length from your height and gender, calculate distance covered, calories burned, and time spent walking. Perfect for tracking fitness goals like 10,000 steps a day.

Strength Standards Calculator - Estimate your one-rep max and compare your squat, bench press, deadlift, and overhead press against practical strength standards based on bodyweight.

Swimming Pace Calculator - Calculate your swimming pace per 100m, lap splits, and estimated race times. Supports freestyle, backstroke, breaststroke, butterfly for pool and open water.

Target Heart Rate Calculator - Calculate your target heart rate zones using the Karvonen method. Find your optimal training zones for fat burning, cardio, and peak performance with personalized heart rate targets.

TDEE Calculator - Calculate your TDEE, BMR, BMI with multiple formulas (Mifflin-St Jeor, Harris-Benedict, Katch-McArdle). Get personalized macro recommendations and visualize your calorie breakdown.

Triathlon Pace Calculator - Plan swim, bike, and run paces for triathlon races including Sprint, Olympic, Half Ironman, and Ironman distances with transition time estimates.

Vertical Jump Calculator - Calculate your vertical jump height from standing and jump reach measurements. Get performance ratings, estimated power output (Lewis & Harman formulas), sport-specific comparisons, and personalized training tips. Featured

VO2 Max Calculator - Calculate your VO2 Max using the Cooper 12-minute run test. Get personalized fitness assessment, training recommendations, and compare your cardiovascular fitness to age and gender norms.

Weight Loss Calculator - Estimate how long it will take to reach your goal weight based on your calorie deficit and activity level. Uses adaptive TDEE recalculation as you lose weight, compares multiple deficit strategies, and shows a week-by-week projection with milestones.