Health & Fitness calculators
Choose a task below. Check each calculator’s assumptions and units before using its result.
Barbell Plate Loading & Racking Calculator | AnythingOnline
Free barbell plate loading calculator. Compute exact plates per side for 20kg/45lb Olympic bars, collar deductions, and progressive warmup sets in kg and lbs.
Creatine Monohydrate Dosage, Loading & Maintenance Calculator | AnythingOnline
Free creatine dosage calculator. Compute personalized creatine monohydrate loading phase (5-7 days) vs steady daily saturation (28 days) and hydration targets by body weight.
Critical Swim Speed (CSS) Pace & Training Zones Calculator | AnythingOnline
Free Critical Swim Speed (CSS) calculator. Compute your CSS pace per 100m/100yd from 400m and 200m time trials, aerobic zones, and interval splits from 50m to 1500m.
Cycling FTP & Coggan 7-Zone Power Calculator | AnythingOnline
Free cycling FTP calculator. Calculate Functional Threshold Power (FTP), watts/kg, and exact Coggan 7 training zones including Sweet Spot.
Cycling Power-to-Weight Ratio (Watts/kg) & Coggan Profile Calculator | AnythingOnline
Free cycling power-to-weight calculator. Compute your FTP W/kg, sprint (5s), anaerobic (1m), and VO2max (5m) watts/kg, Coggan power profile, and Zwift race category.
DOTS & Wilks Score Powerlifting Strength Calculator | AnythingOnline
Free DOTS and Wilks score calculator for powerlifting. Compute your official USAPL & IPF strength coefficients from squat, bench press, and deadlift totals in kg or lbs.
FFMI Calculator (Fat-Free Mass Index & Natural Potential) | AnythingOnline
Free FFMI calculator. Compute Fat-Free Mass Index, normalized height-adjusted FFMI, natural genetic muscular potential, and lean body mass per Kouri et al. benchmarks.
Free Bicycle Chain Length Calculator
Determine exact chain link count from chainstay length and drivetrain cog sizes to prevent rear derailleur rip-off and chain slap.
Free Bicycle Gear Inches & Cadence Speed Calculator
Calculate gear inches, development, and speed at cadence for road and gravel setups.
Karvonen Heart Rate Training Zones (HRR) Calculator | AnythingOnline
Free running heart rate training zones calculator using the Karvonen formula (HRR). Calculate Zone 1-5 aerobic and lactate threshold zones adjusted for resting heart rate.
Marathon Fueling, Carbohydrate & Hydration Calculator | AnythingOnline
Free marathon fueling calculator. Plan race carbohydrates (30-90g/hr), energy gel timing intervals, total gels needed, hourly fluid intake, and electrolyte sodium replacement.
Navy Body Fat Calculator - Body Composition Formula
Calculate body fat percentage, lean tissue weight, and fat mass using the official Department of Defense circumference tape measurement method.
One Rep Max Calculator - 1RM Strength & Percentages
Calculate your true 1RM maximum lift weight across Brzycki and Epley equations with full percentage rep ranges for powerlifting programming.
Rowing Ergometer 500m Split to Watts Calculator | AnythingOnline
Free rowing ergometer split to watts calculator. Convert Concept2 500m split pace to Watts, project 2,000m finish times, and calculate caloric burn rate.
RPE & Reps in Reserve (RIR) Weight Calculator | AnythingOnline
Free RPE and Reps in Reserve calculator. Calculate target training weights and %1RM from reps and RPE for squat, bench press, and deadlift.
Running Pace Calculator - 5K, 10K & Marathon Splits
Calculate required pace per mile and kilometer to hit target finish times across 5K, 10K, Half Marathon, and Marathon race distances.
Running Race Time Predictor (Riegel Formula) | AnythingOnline
Free running race time predictor using Peter Riegel’s formula. Calculate target finish times, paces, and splits from 5K to Marathon.
Sweat Rate & Electrolyte Sodium Loss Calculator | AnythingOnline
Free sweat rate and sodium loss calculator. Compute hourly fluid loss in L/hr, total sweat loss, % dehydration, and sodium replacement targets for endurance athletes.
TDEE & Macro Calculator - Calories, Deficit & Protein
Calculate Basal Metabolic Rate (BMR), maintenance calories (TDEE), target calorie goals, and macro grams of protein, carbs, and fats.
Treadmill Pace, Incline & Elevation Gain Conversion Calculator | AnythingOnline
Free treadmill pace conversion calculator. Convert treadmill speed and incline grade (%) to equivalent outdoor flat road pace, vertical ascent in meters/feet, and metabolic VO2 cost.
Triathlon Split Pace & Finish Time Calculator | AnythingOnline
Free triathlon finish time and split calculator. Calculate race times and pace targets across swim, T1, bike, T2, and run for Sprint, Olympic, 70.3, and Ironman.
VO2 Max Calculator - Aerobic Fitness & Cooper Test
Calculate maximal oxygen uptake ($VO_2$ max in mL/kg/min) and evaluate aerobic endurance fitness percentiles using the Cooper 12-Minute Test.