Free training calculators
Simple tools for the numbers that come up when you're training with a heart rate monitor. No signup, no email, no cookie banner. The maths runs in your browser and nothing is sent anywhere.
Zone 2 heart rate calculator
Your zone 2 range in bpm, under both definitions people mean by zone 2, plus your full five-zone table.
Open →Garmin heart rate zones calculator
Build your five Garmin zones from max heart rate, heart rate reserve, or lactate threshold, the same three bases Garmin Connect offers.
Open →
A calculator gives you an estimate. Your watch has the real thing. Every formula here is a population average, and individual variation around them is wide. If you own a Garmin, the numbers it has recorded from your own efforts beat any estimate on this page.
Ask your own data instead.
stats.training connects Garmin and Strava to Claude or ChatGPT, so you can ask what your real zones, thresholds and trends look like rather than estimating them. $10/month, cancel any time.