Calculators and explainers
Working calculators for the things riders actually have to work out, and two explainers for the things that are more interesting than they sound. No sign-up, nothing stored, nothing sent anywhere — the sums happen in your browser and stay there.
No, and the arithmetic is worth seeing. A UK home needs 285 watts without stopping. Move the slider and find out what your legs could actually run.
Work out your FTP from a 20-minute, ramp, 8-minute or hour test, with your training zones from it — and how to ride the test so the number means something.
All seven power zones from your FTP, plus heart rate zones from your threshold heart rate, and an explanation of why the two disagree.
How fast a given wattage would really take you, on the flat or up a climb, and where every watt goes: air, rolling resistance or gravity.
Your watts per kilo, what the figure means, and what it is worth on a real climb — including the bike, which most calculators forget.
Turn average power and time into kilojoules of work and calories burned, and see the heat that explains why indoor riding feels so much harder.
Gear ratio, gear inches, development and your speed at any cadence — plus which gear to actually use on a turbo trainer, which depends on what kind you have.
Work out how much fluid you lose an hour on the turbo, and what to drink to keep up — indoor sweat rates are routinely double what the same rider produces outdoors.
What to pump your tyre to for a wheel-on turbo trainer, how tight to set the roller, and why this is the opposite of road tyre advice.
Compare your indoor and outdoor threshold power, see whether the gap is normal, and get indoor zones from the right number.
Pick a session, put in your FTP, and get the watts for every interval and every recovery — threshold, sweet spot, VO2 max, over-unders and endurance.
Connect your trainer, pedal, and see which household things your legs could actually run — from an LED bulb to an electric shower, in order of appetite.
Still bored of the turbo?
That is the problem we are actually trying to solve. Turbo Trainer Games turns your watts into the controls of a browser game — your power flies the aircraft, climbs the mountain, pulls the sledge. Nothing to install, and it works with a smart trainer you already own.
It is in closed testing at the moment, so there is nothing to play yet. But you can put your name down.
Ask for early access