Testing your FTP gives you a practical benchmark for setting cycling power zones, controlling workout intensity and tracking changes in fitness. The two most common options are the ramp test and the 20-minute test, but they challenge your body in different ways and may not produce exactly the same result.
A ramp test is shorter, progressively increases the resistance and requires relatively little pacing experience. A 20-minute test demands a longer sustained effort and much better judgement, but it can provide useful insight into your ability to hold steady power.
Choose a ramp test when you want a short, repeatable and largely automated assessment. Choose a 20-minute test when you are experienced at pacing long efforts and want the test to reflect sustained cycling performance more directly.
A common ramp-test calculation is 75% of your best one-minute power. A common 20-minute calculation is 95% of your average power during the 20-minute effort. These are estimates rather than universal physiological laws.
What Is an FTP Test?
Functional Threshold Power, normally shortened to FTP, is a practical estimate of the highest power you can sustain near your cycling threshold. It is measured in watts and is widely used to personalise structured workouts.
Your FTP does not need to represent the exact power you can hold for precisely 60 minutes. In practice, it is a training benchmark used to scale endurance, tempo, sweet spot, threshold and high-intensity sessions to your current fitness.
An FTP test is a controlled cycling assessment used to estimate your threshold power without requiring a full one-hour maximum effort.
Once your FTP has been established, your cycling zones can be calculated as percentages of that number. If the estimate is too high, structured workouts may become unnecessarily difficult. If it is too low, some sessions may not provide the intended training stimulus.
Learn more about the metric itself in our guide to functional threshold power and see how the result affects training in our cycling power zones guide.
Ramp Test vs 20-Minute Test at a Glance
| Feature | Ramp test | 20-minute test |
|---|---|---|
| Test format | Power increases progressively until failure | One self-paced maximal 20-minute effort |
| Common calculation | 75% of best one-minute power | 95% of 20-minute average power |
| Pacing skill | Relatively low | High |
| Main test effort | Short and progressively harder | Long and continuously difficult |
| Smart-trainer mode | Often completed in ERG mode | Normally completed in slope or resistance mode |
| Best suited to | Beginners and riders wanting a repeatable test | Experienced riders with strong pacing skills |
| Primary limitation | Depends heavily on short-duration maximal power | Poor pacing can significantly distort the result |
Simple and repeatable
The resistance increases in small steps until you can no longer continue. You do not need to predict the correct power before the test begins.
Sustained and self-paced
You choose the power yourself and attempt to produce the highest sustainable average for the complete 20-minute interval.
What You Need to Test Your FTP
Both testing methods require a reliable source of cycling power. The most important requirement is that you use the same equipment and a similar setup when comparing one result with another.
Minimum testing setup
- Power meter or power-measuring indoor trainer
- Bike computer, watch or compatible training application
- Stable bike and trainer setup when testing indoors
- Water bottle
- Suitable clothing and cycling shoes
For consistent results
- Powerful fan for indoor testing
- Heart rate monitor
- Towel
- Calibrated or zero-offset power device
- Quiet route when testing outdoors
Different power meters and trainers may report slightly different wattages. Compare results from the same device whenever possible instead of treating numbers from different power sources as directly interchangeable.
How to Prepare for an FTP Test
An FTP test should measure your cycling ability rather than your ability to perform while tired, overheated or under-fuelled. You do not need a complete taper, but you should begin the test reasonably fresh.
Reduce fatigue
Avoid a demanding interval session, long ride or hard run immediately before the test. An easy day or rest day is appropriate for most riders.
Eat normally
Arrive fuelled rather than deliberately restricting carbohydrate. Avoid testing directly after a very large meal.
Prepare your equipment
Charge sensors, check connections and complete any manufacturer-recommended calibration, zero offset or trainer spindown.
Control the environment
Use strong airflow indoors and keep the room reasonably cool. Excess heat can raise cardiovascular strain and reduce sustainable power.
Repeat your normal conditions
Test at a similar time of day, with similar equipment and under similar conditions whenever you want to compare progress.
The most useful testing protocol is one you can repeat under similar conditions. Changing the test, trainer, bike and environment at the same time makes progress harder to interpret.
How to Do a Ramp Test
A ramp test begins at a manageable power and becomes progressively harder. The target normally increases every minute or at another fixed interval until you can no longer maintain the required power or cadence.
The exact starting power, step size and calculation vary between platforms. Follow the instructions supplied by the application performing the test rather than manually combining parts of different protocols.
Progressively increasing power until failure
Your application may adjust the individual stages according to your current FTP estimate or previous training data.
Complete the warm-up
Begin with easy cycling and follow any short activation efforts included in the test workout.
Enter the progressive ramp
Ride at the requested target as the power increases in fixed steps. Avoid deliberately riding above the target during the early stages.
Maintain a stable cadence
Use a cadence that feels natural and sustainable. Large cadence changes can make resistance control more difficult on some trainers.
Continue until genuine failure
The final stages should become extremely difficult. Continue until you can no longer maintain the target despite a maximal effort.
Cool down
Reduce the resistance and pedal easily while the application calculates or displays your FTP estimate.
Ramp-test FTP calculation
A commonly used ramp-test formula takes 75% of your highest one-minute power during the test.
Estimated FTP = best one-minute power × 0.75
If your best one-minute power during the ramp is 320 watts:
320 W × 0.75 = 240 W estimated FTP
| Best one-minute power | Calculation | Estimated FTP |
|---|---|---|
| 240 W | 240 × 0.75 | 180 W |
| 280 W | 280 × 0.75 | 210 W |
| 320 W | 320 × 0.75 | 240 W |
| 360 W | 360 × 0.75 | 270 W |
| 400 W | 400 × 0.75 | 300 W |
Do not manually replace the result produced by your training application unless you understand its protocol. Some platforms use additional adjustments rather than applying a simple 75% calculation in every situation.
Advantages of a ramp test
- Requires relatively little pacing experience.
- The hardest part of the test is comparatively short.
- Easy to perform indoors on a smart trainer.
- The protocol is straightforward to repeat.
- Beginners do not need to predict their threshold power accurately.
- It creates less prolonged discomfort than a 20-minute maximum effort.
Limitations of a ramp test
- The estimate depends heavily on power produced during a short final period.
- Riders with unusually strong short-duration power may receive an FTP that feels too high.
- Riders with weaker maximal aerobic power relative to endurance may receive a conservative estimate.
- A cadence collapse in ERG mode can end the test abruptly.
- It does not directly test your ability to pace a long threshold effort.
Common ramp-test mistakes
Riding above the early targets
Producing unnecessary power during the easier stages adds fatigue without improving the result. Follow the target closely.
Stopping when it becomes uncomfortable
A ramp test is designed to end in failure. The final stages should feel extremely difficult.
Changing cadence dramatically
Sudden cadence changes may cause unstable resistance or accelerate the ERG-mode spiral near the end.
Starting with tired legs
Residual fatigue can limit the final one-minute power and produce a lower FTP estimate.
How to Do a 20-Minute FTP Test
The 20-minute test asks you to produce the highest average power you can sustain for one continuous 20-minute effort. It sounds simple, but obtaining an accurate result requires good pacing.
Some formal protocols include a hard five-minute effort before the main test to reduce the influence of short-duration anaerobic power. Others use a different warm-up. Follow one complete protocol consistently rather than adding or removing difficult efforts from one test to the next.
The 20-minute test must be self-paced. Use slope, resistance or another free-riding mode during the test interval so that you can increase or decrease your own power.
Practical 20-minute test protocol
Easy warm-up
Ride easily for 10–15 minutes while gradually increasing your effort.
Activation efforts
Complete several short, controlled increases in power with easy cycling between them.
Protocol-specific hard effort
Complete the preliminary hard effort when it is included in your chosen test. Do not add one when the platform does not prescribe it.
Recovery
Ride easily for approximately 5–10 minutes or for the duration specified by the test protocol.
20-minute maximum effort
Produce the highest average power you can sustain evenly across the full interval.
Cool-down
Pedal easily for at least 5–10 minutes before ending the session.
How to pace the 20-minute effort
The ideal effort is controlled at the beginning, demanding through the middle and maximal by the final minutes. Starting too hard often produces a high initial number followed by a substantial decline.
Break the effort into four five-minute blocks
Controlled start
Settle near the power you believe you can sustain. The effort should feel hard but not desperate.
Establish rhythm
Focus on breathing, cadence and smooth power. Avoid reacting to every small fluctuation.
Hold the effort
This is often the most mentally difficult part. Maintain power rather than making a premature surge.
Empty the tank
Increase gradually when possible. The final one or two minutes should require a maximal effort.
A small increase near the end is normal. A huge final sprint may indicate that you rode too conservatively, while a major power decline usually means the opening pace was too aggressive.
20-minute FTP calculation
A common method estimates FTP as 95% of the average power produced during the 20-minute test interval.
Estimated FTP = 20-minute average power × 0.95
If your average power for the test is 260 watts:
260 W × 0.95 = 247 W estimated FTP
| 20-minute average power | Calculation | Estimated FTP |
|---|---|---|
| 200 W | 200 × 0.95 | 190 W |
| 230 W | 230 × 0.95 | 219 W |
| 260 W | 260 × 0.95 | 247 W |
| 300 W | 300 × 0.95 | 285 W |
| 340 W | 340 × 0.95 | 323 W |
The 95% multiplier is a general estimate. One rider may be able to sustain slightly more than 95% of 20-minute power near threshold, while another may sustain less. Your short-duration power profile, pacing and the warm-up protocol all influence the result.
Advantages of a 20-minute test
- Tests sustained power over a meaningful duration.
- Rewards controlled pacing and aerobic durability.
- Can be completed indoors or on a suitable outdoor route.
- Provides a useful 20-minute performance benchmark.
- May feel more specific to time trials and long triathlon efforts.
Limitations of a 20-minute test
- Requires good pacing experience.
- Starting too hard can ruin the result.
- The test creates prolonged physical and mental discomfort.
- The 95% relationship is not equally accurate for every rider.
- Traffic, corners and terrain can disrupt an outdoor test.
- ERG mode cannot appropriately control a self-paced maximum effort.
Which FTP Test Is More Accurate?
Neither test is universally more accurate for every cyclist. Both use a shorter performance to estimate a threshold that cannot be perfectly represented by one fixed formula.
The ramp test derives the result mainly from your final short-duration power. The 20-minute test relies on sustained power and an assumed relationship between your 20-minute performance and FTP.
You value repeatability
- You are new to power-based training.
- You struggle to pace long maximum efforts.
- You want a relatively short assessment.
- You test frequently on an indoor trainer.
- Your resulting training zones feel realistic.
You understand your pacing
- You have experience with time trials.
- You can sustain steady power without ERG mode.
- You want to assess longer-duration performance.
- Your ramp result consistently makes threshold work too hard.
- You can reproduce suitable testing conditions.
An FTP estimate is useful when it produces realistic training zones. The highest test result is not automatically the most accurate result.
Why Do the Tests Produce Different Results?
It is normal for a ramp test and a 20-minute test to produce different estimates. They use different efforts, calculations and physiological strengths.
Power profile
Some riders are relatively stronger during short maximal efforts, while others perform better during long steady efforts.
Pacing
A 20-minute result can be reduced by an overly aggressive start or an unnecessarily conservative effort.
Testing protocol
Warm-up structure, preliminary efforts and recovery periods affect the power available during the main test.
Cadence
An unfamiliar cadence or incorrect gearing can limit performance independently of cardiovascular fitness.
Environment
Heat, airflow, altitude and indoor versus outdoor conditions can change sustainable power.
Fatigue
Recent training, sleep and nutrition can influence either test even when your underlying fitness has not changed.
What Should You Do If the Results Disagree?
A small difference is not a problem. FTP is an estimate, and day-to-day performance naturally fluctuates. A large difference should be evaluated through training rather than resolved by automatically selecting the higher number.
Review the test execution
Check pacing, cadence, calibration, cooling, fatigue and whether you followed the complete protocol.
Consider your rider profile
A rider with strong short-duration power may naturally perform better in a ramp test than during a sustained threshold effort.
Evaluate your workouts
Threshold sessions should be difficult but achievable. Repeated failure at the prescribed power may indicate that FTP is set too high.
Make a conservative adjustment
Adjust the number slightly when necessary instead of changing it dramatically after one unusual result.
Use one method for future comparisons
Repeating the same protocol makes changes in your result easier to interpret.
Should You Test FTP Indoors or Outdoors?
Both options can work, but the results may differ. Indoor testing offers a controlled environment, while outdoor testing may allow some riders to produce more power because of better cooling, bike movement and motivation.
Controlled and convenient
- No traffic or route interruptions
- Easy to repeat under similar conditions
- Compatible with automated ramp tests
- Requires strong cooling
- Continuous pedalling may feel harder
Natural but harder to control
- Better natural airflow
- May feel more motivating
- Requires a safe uninterrupted route
- Gradient and wind affect pacing
- Traffic and corners can invalidate the effort
Set your training zones using the environment in which you complete most structured workouts when possible. An indoor FTP based on an indoor test may be more useful than a higher outdoor number when nearly all threshold sessions are performed on a trainer.
How Often Should You Test Your FTP?
You do not need to test every week. Fitness adaptations take time, and frequent maximal testing can interrupt productive training.
You may not need a formal test when recent training contains reliable maximal or near-maximal efforts. Some platforms can estimate changes from completed ride data, but consistent testing remains useful when you want to compare a standardised performance.
FTP will not rise after every training block. Better endurance, lower heart rate at submaximal power and an improved ability to repeat hard efforts can still represent meaningful progress.
What Should You Do After the Test?
Once the test is complete, update the FTP value in the training platforms and devices that use it to calculate workout targets.
- Save the activity and test result.
- Record the test type and power source.
- Note indoor temperature, cooling and perceived exertion.
- Update cycling power zones where necessary.
- Review the first structured workouts using the new value.
- Avoid retesting immediately because the number was lower than expected.
Your endurance rides should remain controlled after an FTP increase. See our guide to Zone 2 cycling for help using power and heart rate together during aerobic training.
Common FTP Testing Mistakes
Testing while heavily fatigued
A demanding training week can suppress performance and make your FTP appear lower even though your long-term fitness has improved.
Using inadequate cooling
Indoor heat accumulation increases strain and can substantially reduce the power you can sustain.
Changing protocols repeatedly
Switching between tests makes it difficult to determine whether a change reflects fitness or simply a different calculation.
Selecting the highest result
A larger FTP creates harder workouts but does not automatically represent better accuracy or greater fitness.
Ignoring the power source
A trainer and pedal-based power meter may report different values. Record which device produced each result.
Treating FTP as your only fitness metric
FTP does not fully describe sprint power, aerobic endurance, fatigue resistance, bike handling or running ability after the bike.
Frequently Asked Questions
Is a ramp test easier than a 20-minute FTP test?
A ramp test normally involves less prolonged discomfort and requires less pacing skill, but the final stages are still maximal. Many beginners find it mentally easier than sustaining a maximum effort for 20 minutes.
Does a ramp test overestimate FTP?
It can overestimate FTP for some riders whose short-duration maximal power is unusually strong compared with their sustained threshold ability. Other riders may receive an accurate or conservative estimate.
Is 95% of 20-minute power always equal to FTP?
No. The 95% multiplier is a practical estimate. The actual relationship between 20-minute power and sustainable threshold power varies between riders and can be affected by the testing protocol.
Can I perform an FTP test without a smart trainer?
Yes. You need reliable power data, but it can come from an on-bike power meter. A 20-minute test can be completed outdoors on a safe, uninterrupted route or indoors on a traditional trainer.
Should I use ERG mode for an FTP test?
ERG mode is commonly used for platform-guided ramp tests. It should normally be disabled during a 20-minute self-paced effort because you need to control and adjust your own power.
What cadence should I use during an FTP test?
Use a cadence that feels natural and can be maintained throughout the test. Avoid testing at an unfamiliar cadence simply because you believe it should produce a better result.
Can I stand during a ramp test?
Follow the instructions provided by the specific testing platform. Some protocols ask riders to remain seated so that every test is completed in a consistent way.
Why is my indoor FTP lower than my outdoor FTP?
Reduced cooling, continuous pedalling, trainer feel, bike movement and motivation can all contribute. Differences between the indoor trainer and outdoor power meter may also affect the result.
Should triathletes use a ramp test or 20-minute test?
Either test can work. A 20-minute effort may feel more specific to sustained triathlon cycling, while a ramp test is convenient and repeatable. The best choice is the test that produces realistic training zones and can be repeated consistently.
What should I do if my FTP decreases?
Review fatigue, testing conditions, recent illness, equipment and protocol execution. A temporary decrease does not necessarily mean your overall fitness has declined. Use the result that makes your current workouts appropriately challenging.
Final Takeaway
A ramp test and a 20-minute test can both provide a useful FTP estimate. The ramp test is shorter, easier to pace and convenient on a smart trainer. The 20-minute test requires more experience but evaluates your ability to sustain a long, hard effort.
Neither method is perfect. Use the same test, power source and conditions whenever possible, then confirm the result through your structured workouts.
The purpose of an FTP test is not to produce the largest possible number. It is to establish realistic training zones that help you complete the right work at the right intensity.
FTP testing protocols and calculations vary between training platforms. Always follow the complete instructions supplied by the application or device performing your test.
