What is cycling FTP?

The problem: what is cycling FTP in your situation?

Your cycling computer asks for FTP, but you do not know what to enter. Perhaps you received an estimate after a ride. A training programme displays another number. It can seem as though one of them must be wrong.

Uncertainty can remain after a test too. You ride indoors in a different position from outdoors. You might use a different power meter. You remember the final number, but no longer remember exactly how you performed the test.

That makes comparison difficult. A higher number can feel encouraging, although the conditions have changed too. A lower number likewise cannot explain the difference without additional information. The number alone is not a complete record of your effort.

What you need is a traceable starting point. This guide explains what our calculator does and what you should record yourself. You can then use a value without immediately drawing conclusions about health, talent or your ideal riding position.

Background: test factors are calculation conventions

FTP is a power reference used when planning and comparing effort. This calculator lets you enter a known FTP. That value remains unchanged. The calculator does not verify the quality of the original estimate by accepting it.

For the twenty-minute method, the model uses 95 percent of the entered test power. For the ramp method, it uses 75 percent. These are factors from our calculation rules. They are not universal descriptions of how every body responds to a test.

A calculation example makes the distinction clear. Entering 200 watts for the twenty-minute test produces 190 watts.

That comes from multiplying by 0.95. It does not prove that you personally can sustain exactly 190 watts for a prolonged effort.

The input must also match the selected method. An arbitrary peak power is not a useful substitute for the output of a ramp protocol. Follow your test provider's instructions. This guide does not prescribe a maximal exercise test itself.

Watts per kilogram comes from dividing calculated FTP by body mass. This does not remove uncertainty from the original test. It is not an instruction to lose weight either. Bike mass, position, wind and gradient remain relevant to actual speed.

The calculator also displays speed and climb time using fixed bike assumptions. These are model outputs, not additional test measurements. Your position is not measured and your medical exercise capacity is not assessed. Keep method, measuring device and conditions with every value you intend to compare later.

How to approach it: make your records comparable

1. Find the origin of your value: Record the date, device and test method. Check whether the number is already FTP or still the original test power. Multiplying an already converted value by another test factor produces a different result.

   Keep the original report. If the method is missing, treat the number as uncertain rather than making a precise comparison.

2. Choose the appropriate input: Select ‘known’ for an existing FTP value. Choose the twenty-minute method only for its corresponding test result. Use the ramp method only when you know which power value your protocol supplies for that purpose.

   The FTP calculator helps you check the calculation. A calculator cannot reconstruct missing information about a test after it happened.

3. Describe the measuring conditions: Record indoors or outdoors, cooling, bike and power meter. Follow the instructions for checking and calibrating your device. Prefer the same measuring source and procedure when making comparisons.

   Record whether you used a different position too. Avoid unknowingly comparing a comfortable outdoor ride with a test on an unfamiliar indoor setup.

4. Keep your setup consistent: Measure saddle height with a tape measure and take a side photograph. Record measurement points and hand position for later comparisons. Keep this setup unchanged during your comparison so you are not also investigating a different position.

   Place the trainer on a stable surface according to its instructions. Use the same prescribed front wheel support and bike orientation each time. After moving it, check the attachment against manufacturer instructions and restore recorded measurements if components have shifted.

5. Check repeatability gently: Complete two to three easy rides with the same setup. Check that support, hand position and access to controls remain consistent. These are not FTP tests and you do not need to produce a maximal effort.

   Resolve a shifted or unsafe setup first; do not continue testing through it. If a position change is needed, record it separately and postpone the power comparison. Arrange any later test using a suitable protocol, recording the conditions again.

6. Do not prioritise the number over symptoms: Stop exercising for pain rather than continuing to finish a test. Discuss recurring position problems with a fitter. Seek individual advice first if you are unsure about safely performing hard exercise.

   Pain at rest or at night, swelling or radiating tingling need clinical assessment. Seek help if pain remains after three to four careful adjustments. A higher FTP does not make those symptoms less important.

Further reading

• Cycling power and speed: what changes? explains why an FTP value alone cannot predict a fixed speed on the road.
• Cycling climb time: plan your effort helps you recognise how a power estimate affects calculated climbing time.
• Endurance bike fit: comfort over distance directs attention towards support and comfort as your ride gets longer.
• Bike setup measurements: record your position helps you preserve the position used during measurement for a fair comparison later.
• The FTP calculator converts your chosen test method so you can store the input and result together.

Frequently asked questions

Is FTP the same as my highest recorded power?

No. A short peak and a reference for sustained effort answer different questions. Do not use the highest ride value without checking the test method. Consult the original report and your test provider's instructions before placing a number in an input field.

Can I compare different power meters directly?

Be cautious with that comparison. Record which device you used and follow its instructions. A changed value from a different measuring source does not by itself prove a change in your ability. Keep the measuring source as carefully as you keep the test date.

Should FTP increase after a setup change?

No. Assess a setup trial first for comfort, support and control. The calculator does not predict a power gain from moving your saddle.

Test a new position gently before considering hard exercise. Return to the previous setting if the change makes riding worse.

Do I need a lower weight for a better result?

No. Watts per kilogram is a calculation ratio, not personal weight advice. Enter your current mass honestly and assess the original power measurement. Improving a displayed number by entering an incorrect body mass simply makes your preparation less useful for the ride ahead.