Free endurance calculators with the assumptions left visible.
Predict your race, find your zones, score your sessions, and plan your taper with transparent methods. The full app adds your history, constraints, and validation. No account or paywall.
- Race day
- Training load
- Zones & thresholds
- Swim
- Planning
- Bike & gear
Most popular
Race Time Predictor
Predict a finish-time range, per-leg splits and race-day pacing from your real thresholds.
CSS Calculator
Find your CSS from a 400/200 time trial and get five swim pace zones.
Training Load Calculator
Score any swim, bike, run, or strength session in one place.
Fitness, Fatigue & Form
Turn 12 weeks of training load into your fitness, fatigue, and form curve.
Training Zones
Turn one threshold into bike, run, swim, and heart-rate zones.
Training Hours Check
See whether your weekly hours can actually get you race-ready for your distance.
Tire Pressure Calculator
Front and rear pressures from your weight, tire width, and surface.
Race day
Training load
Training Load Calculator
Score any swim, bike, run, or strength session in one place.
Fitness, Fatigue & Form
Turn 12 weeks of training load into your fitness, fatigue, and form curve.
ACWR Load-Ramp Check
Compare recent load with your 28-day baseline — one context signal, not an injury prediction.
Zones & thresholds
Swim
Planning
Bike & gear
From tools to a plan
These numbers are the inputs. PaceBeats builds the plan.
PaceBeats combines the matching calculations with your history, thresholds, race, constraints, and workout library to rebuild an adaptive plan each week.