Automatic FTP Detection

Most cyclists test their FTP only a few times a year — if that. It's uncomfortable, requires planning, and life gets in the way. Meanwhile, your actual threshold is changing all the time. After a good training block, it's probably higher than you think. After time off, it's probably lower.

Outdated FTP means your training zones are wrong, your metrics are misleading, and you're training in the dark.

FormBeat solves this by continuously estimating your FTP from your regular rides.

How it works

We use a multi-parameter model called Critical Power analysis. Instead of relying on a single 20-minute test, it looks at your power outputs across many durations — from hard efforts on group rides to sustained climbs to interval sessions. By analyzing the mathematical relationship between power and duration across your rides, we can estimate your sustainable threshold power.

The more you ride, the more accurate it becomes. And because it updates continuously, your FTP estimate evolves as your fitness changes.

What you'll see

When FormBeat detects that your FTP has likely changed, you'll see it on your dashboard. You can accept the new estimate, adjust it if you know better, or ignore it if you've recently done a proper test.

You'll also see your FTP trend over time — a record of your threshold power rising (hopefully) as you train. When your FTP changes, your training zones update automatically, so all subsequent ride analysis uses the correct zones. No manual recalculation needed.

This doesn't replace testing — it complements it

If you do formal FTP tests — whether a 20-minute field test or a lab assessment — those values are worth entering in FTP & Power Zones settings to anchor your training zones. But between tests, FormBeat keeps things current. And for riders who never test formally, automatic detection means you still get reasonably accurate zones — something is always better than a guess from two years ago.

The goal is simple: your training zones should reflect your current fitness, not your fitness from months ago. Automatic FTP detection makes that happen without the pain of constant testing. Curious where your FTP stacks up? Try our How Good Is My FTP? tool.