Free Rowing Calculators
Essential tools for Concept2 indoor rowers. No signup, no ads, instant results.
Training Zone Calculator
Enter your 2K split or time and get personalized pace targets for all 5 rowing training zones (UT2, UT1, AT, TR, AN).
Zones, pacing, steady state, intervals
Pace / Watts / Calorie Calculator
Convert between split per 500m, watts, and calories per hour. See exactly how your Concept2 numbers relate to each other.
Split, watts, cal/hr, power output
2K Erg Time Predictor
Predict your 2,000m erg time from a longer piece. Enter a 5K, 6K, 10K, or 30-minute result and get an estimated 2K split.
2K estimate, race prediction, Paul's Law
Heart Rate Zone Calculator
Calculate your 5 heart rate training zones using the Karvonen method (Heart Rate Reserve). Enter max and resting HR for personalized targets.
Karvonen, HRR, heart rate reserve, HR zones
Erg Score Percentile ("How Good Am I?")
Find out how your erg time compares by age and gender. See your percentile ranking and classification level.
Good erg time, percentile, ranking, benchmarks
VO2max Calculator
Estimate your VO2max from a 2K erg test. See your fitness classification based on ACSM norms.
VO2max, cardio fitness, Hagerman formula
Calorie Calculator (PM5 vs Actual)
Compare what the PM5 monitor shows vs your real weight-adjusted calorie burn.
Calories burned, PM5, weight-adjusted burn
All-Distance Time Predictor
Enter one known erg result and predict your time for every standard Concept2 distance (500m to marathon).
Distance prediction, Paul's Law, all distances
2K Race Pace Planner
Plan your 2K erg test with a 500m-by-500m pacing strategy. Even split, negative split, or fly-and-die.
Race strategy, pacing plan, negative split
Erg to Running Pace Converter
Convert your rowing erg pace to equivalent running paces for mile, 5K, 10K, half marathon, and marathon.
Rowing to running, CrossFit conversion, VDOT
FTP & Power Zones Calculator
Calculate your rowing Functional Threshold Power and 7 watts-based training zones.
FTP, power zones, watts-based training
Power Profile (Jensen Model)
See your predicted scores across 5 test durations. Identify if you're sprint- or endurance-dominant.
Jensen Model, power profile, sprint vs endurance
Drag Factor Recommender
Answer 3 questions to get a personalized drag factor and damper setting recommendation.
Drag factor, damper setting, PM5 setup
Calories to Meters Converter
Convert between calories and meters on the Concept2 rower. Essential for CrossFit WODs.
CrossFit, cal to meters, WOD conversion
Weight-Adjusted Score Calculator
Calculate your weight-adjusted erg time using the Concept2 formula. Compare scores fairly across different body weights.
Weight correction, fair comparison, ranking
Age & Weight Handicap Calculator
Combined age and weight correction using Concept2 and USRowing formulas. Fair comparison across all demographics.
Age handicap, combined correction, masters rowing
Stroke Efficiency / SPI Calculator
Calculate distance per stroke, watts per stroke, and Stroke Performance Index (SPI) to measure technique quality.
SPI, stroke efficiency, technique analysis
Want these calculations done automatically?
ErgManiac calculates zones, tracks watts, and predicts race times from your actual workouts. No manual entry needed.
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