Calculators and templates
Evidence-backed calculators, pacing tables, and planning templates built for runners who track the details.
Running Power Calculator
Calculate your running power output in watts using pace, race times, or your Strava data. Comprehensive guide to power-based running including device comparisons, Stryd, and training methodology.
Heart Rate Reserve Calculator
Calculate your heart rate reserve (HRR) and training zones using the Karvonen formula. Get more accurate heart rate zones based on your resting and max heart rate.
Weight-Adjusted Performance Calculator
Understand how body weight affects running performance. Calculate the performance impact of weight changes and find your optimal racing weight range.
Running Cadence Calculator
Find your optimal running cadence based on height and pace. Calculate stride length and steps per mile to improve your running efficiency.
Training Load Calculator
Calculate your acute and chronic training load to optimize fitness and manage fatigue. Understand ATL, CTL, and TSB to train smarter and avoid overtraining.
Body Fat Percentage Calculator for Runners
Estimate your body fat percentage using the Navy Method. Understand healthy body fat ranges for runners and how body composition affects performance.
Foot Strike Pattern Analysis
Understand your foot strike pattern and whether you should change it. Assess the implications of heel, midfoot, and forefoot striking for your running.
Maximum Heart Rate Calculator
Estimate your maximum heart rate using multiple scientific formulas. Compare results from traditional, Tanaka, Gulati (women), and HUNT (fitness-adjusted) methods.
Pace Conversion Calculator
Convert running pace between min/mile, min/km, mph, and km/h. Quick reference for international pace comparisons and treadmill settings.
Running Pace Reference Card
A handy reference card with pace conversions, race time equivalents, and common training paces. Print and keep in your running bag.
Running Training Log Template
A comprehensive weekly training log for runners. Track runs, workouts, cross-training, sleep, nutrition, and how you feel to optimize your training.