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.
Bike Gear Ratio Calculator - Calculate your bicycle gear ratio, gear inches, development (rollout), and gain ratio from your chainring and cog teeth, then see your speed at any cadence and wheel size. Includes an animated gear visualization, a speed-vs-cadence chart, gear classification, and a full step-by-step breakdown. New
BMR Calculator - Calculate your BMR (basal metabolic rate) and RMR (resting metabolic rate) plus daily calorie needs with the Mifflin-St Jeor and Harris-Benedict equations. Includes TDEE, activity-level breakdown, macronutrient estimates, and a 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
Boxing Punch Power Calculator - Estimate your punch force, impact energy, and power output from your body weight, fist speed, and effective striking mass. The Boxing Punch Power Calculator turns the physics of a punch (impulse, momentum, and kinetic energy) into clear numbers — impact force in newtons and pounds, energy in joules, and power in watts and horsepower — then rates your punch on a visual power gauge and compares it to amateur and professional benchmarks. Supports metric and imperial units with a full step-by-step breakdown. 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.
Cooper 12-Minute Run Calculator - Estimate your VO2 Max from the Cooper 12-minute run test. Get your official Cooper fitness rating by age and gender, see your distance on an animated 400 m track, and predict your 1-mile, 5K and 10K race times. New
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.
FFMI Calculator - Calculate your FFMI (Fat-Free Mass Index) and adjusted FFMI from your weight, height, and body fat percentage. See how your muscle mass compares on a visual gauge, how close you are to your natural muscular limit, and how much lean mass you have left to gain. Supports metric and imperial units with a step-by-step breakdown. New
Hydration Calculator - New
Lean Body Mass to Strength Calculator - Predict your strength potential from lean body mass instead of total bodyweight, because muscle produces force and fat does not. Get predicted 1RMs for the squat, bench, deadlift, and overhead press, a strength-to-lean-mass ratio for each lift, FFMI, and an optional Muscle Efficiency score that reveals how much of your muscle's force potential you have actually realized. 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 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.
Race Time Predictor - Predict your 5K, 10K, 10-mile, half marathon, and marathon finish times from a single recent race result using Riegel's endurance formula. See every predicted time and pace on an animated race-lane chart, switch between min/km and min/mile, fine-tune the fatigue factor, and follow a full step-by-step breakdown. New
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. Featured
Yoga Pose Hold Timer - New
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