Tools
Free calculators for endurance athletes.
Quick, honest calculators for the numbers most training plans care about. Every tool is free, works without signup, and links to the Gneta feature that replaces the estimate with real data from your Garmin.
Heart rate zone calculator
All 5 training zones using Karvonen, % Max HR, or MAF 180. Uses Tanaka formula for more accurate max HR.
PACERace pace predictor
Enter a recent race time. Get predicted times for 5K, 10K, half marathon, and marathon — plus your training paces.
VO2VO2 max estimator
Estimate VO2 max from a Cooper 12-minute test, Rockport walk test, or 1.5-mile run. Get your fitness category.
FTPFTP estimator
Convert a 20-minute or 8-minute best effort into Functional Threshold Power. Get all 7 cycling power zones.
TSSTraining load calculator
Track Chronic Training Load, Acute Training Load, and Training Stress Balance from recent workout TSS.
For athletes who want the real numbers
Calculators are a start. Gneta is what happens next.
Every formula on this page is an approximation. Once your Garmin has a few weeks of data, Gneta can use your real resting HR, HRV trend, max HR, and threshold estimates instead of age-based formulas. That's the point of training with data.
Start Free 14-Day TrialNo credit card required