FTP RUNNING CALCULATOR: TEST YOUR THRESHOLD, STOP TRAINING USING MEMORY AS EFFORT
- Paul M Johnson - CNC,CSNC,PES
- Aug 1
- 3 min read
Fitness moves. Your sense of "hard" doesn't always move with it. This page fixes that with an actual number.
THE PROBLEM IN ONE LINE
Run the same threshold workout enough times and the effort becomes automatic. Fitness improves, but the pace you associate with "hard" doesn't automatically update — so you keep training a feeling instead of your actual physiology.
FTP ZONE CALCULATOR — starts from a tested threshold pace
PACE INTENSITY CALCULATOR — starts from a recent race result
Use whichever one matches what you actually have. Have a fresh test number? Use the first. Have a recent race but no test? Use the second.
HOW TO TEST YOUR THRESHOLD
10-minute easy warm-up
3 x 1-minute strides
20 minutes at the fastest pace you can genuinely sustain
Cool-down
Take your average pace, add 5 percent — that's your estimated FTP
Prefer a harder, more direct option?
There's a 30-minute all-out alternative that skips the 5 percent correction entirely. It's more demanding to pace correctly — going out too fast and fading in the back half is the most common way to blow it.
YOUR 5 ZONES (FTP ZONE CALCULATOR)
ZONE 1 — aerobic base, recovery
ZONE 2 — moderate
ZONE 3 — your tested threshold, lactate clearance and tempo work
ZONE 4 — interval
ZONE 5 — short, fast repeats
The visual arc shows how narrow the gap actually is between Zone 3 and Zone 5 — which is exactly why "hard" runs quietly slide into the wrong zone without a number to check against.
WHAT THE PACE INTENSITY CALCULATOR ADDS
Enter a recent race distance and time instead, and you get:
A full 7-pace workout table — Easy, Long Run, Aerobic Threshold, Marathon Pace, Anaerobic Threshold, Tempo, VO2 Max
Equivalent predicted times across 6 other distances, via the Riegel formula
VO2 Max interval splits for track work, 200m up to a full mile
VDOT CALCULATOR VS. THIS ONE — WHICH TO USE
Both solve a similar problem, differently:
VDOT — one race result, Daniels-Gilbert formula
FTP Running Calculator — a dedicated field test, or a race result run through the Pace Intensity tool.
No recent race? Run the field test. Have a trusted recent result? Either tool gets you close.
HOW TO ACTUALLY USE THIS
Pick your starting point — tested pace or race result
Run the 20-minute test if you're going that route
Get your zones or pace table
Retest or recalculate every 6-8 weeks
Watch for a threshold pace that hasn't moved despite feeling fitter — that's your signal to retest
WHAT THIS CALCULATOR CAN'T DO
It tells you what each pace targets. It doesn't tell you how many threshold sessions belong in a given week, or how that should shift as a race approaches. That's a training plan's job.
The Training Plan Selector matches you to an Andiamo²® plan built around exactly this kind of periodized structure.
PAIRS WELL WITH
FTP Cycling Calculator — same testing logic, applied to the bike
Race Pace Strategy Calculator — turns your threshold pace into a real race-day execution plan, adjusted for running off the bike.
FAST ANSWERS
Which test should I use, 20-minute or 30-minute?
The 20-minute test with the 5 percent correction is more forgiving to pace. The 30-minute test is slightly more accurate when executed well, but harder to hold steady.
Isn't this the same as just using my 5K pace? No. Threshold pace targets sustained, moderately-hard effort for about an hour. A 5K is a different, harder intensity entirely.
My threshold hasn't changed in months but I feel fitter. What's going on? Retest. Perceived effort can improve without your actual threshold moving, especially if you haven't retested recently.
Why does the Pace Intensity Calculator ask for a race instead of a test? It's the faster path if you already trust a recent result. No dedicated test session required. Use the FTP Running Calculator here.
Would you rather swim than run to get fit? The Splash Class is a free 12-week swim and strength plan to start there. Just enter your email address, then check your inbox for you access code.
Not sure which tool fits your situation? Ask a coach directly.
Thanks for reading!
Andiamo²®
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