Heart Rate Zone Calculator
Calculate your five heart rate training zones from estimated or measured maximum heart rate – as a percentage of HRmax or using the Karvonen formula with resting heart rate.
Sports & Training
Rechnerpilot's sport and training calculators help you plan endurance, strength and multisport training. From heart-rate zones and VO₂max through race predictions and FTP to swim CSS and triathlon target times, every result comes with a worked solution.
Endurance & Running
Calculators and tools in the Endurance & Running section.
Open
Hiking Time Calculator
Estimate walking time for a hike from distance, ascent, and descent – using Naismith's rule or the SAC/DAV method.
Pace Calculator
Calculate running pace in min/km, speed in km/h, distance or finish time – with presets for 5 km, 10 km, half marathon and marathon.
Rowing Ergometer Calculator
Convert /500 m split on the rowing ergometer to watts and estimate target time for a distance. Based on the Concept2 model Watts = 2.8 ÷ Pace³.
Running Age Grade Calculator
Calculate Age Grade and Age Adjusted Time using the 2025 CC0 WMA/USATF Road Running Standards for 1 mile to marathon.
Running Prediction Calculator
Predict target time for other distances from one running result – 5 km, 10 km, half marathon, and marathon using the Riegel formula.
VDOT & Training Pace Calculator
Calculate a VDOT model value and pace ranges for Easy, Marathon, Threshold, Interval and Repetition from race distance and time.
VO₂max Calculator
Estimate your VO₂max from the 12-minute Cooper test or from a race time and assess your aerobic endurance.
Strength Training
Calculators and tools in the Strength Training section.
1RM Calculator
Estimate your one-rep max (1RM) from a set using Epley, Brzycki, or Lombardi – and derive appropriate training weights for 1 to 15 reps.
Barbell Plate Loading Calculator
Calculate symmetric barbell loading in kg or lb: plates per side, loaded weight, difference and total plate count.
Powerlifting score calculator
Calculate DOTS, Wilks 2 (2020) and IPF GL Points from body weight and total with documented coefficients.
RPE/RIR Training Weight Calculator
Plan working weight from 1RM, reps and RPE/RIR or estimate your e1RM from a test set.
Cycling
Calculators and tools in the Cycling section.
Bicycle Gear Calculator
Calculate gear ratio, gear development, and speed at a cadence from chainring, cog, and wheel circumference.
Cycling Power Calculator
Estimate required pedaling power in watts from weight, speed, and gradient – with W/kg and the components for gradient, rolling, and air resistance plus VAM (meters per hour).
FTP Calculator
Calculate your functional threshold power (FTP) from a 20-minute test and derive the seven Coggan power zones and your W/kg.
Swimming
Calculators and tools in the Swimming section.
Swimming CSS Calculator
Calculate your critical swim speed (CSS) from a 400 m and 200 m time and derive your training pace per 100 m.
Multisport
Calculators and tools in the Multisport section.
Triathlon Target Time Calculator
Calculate your triathlon target time for sprint, Olympic distance, half distance, and full distance from swim pace, bike speed, run pace, and transition times.