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Pomer výkonu k hmotnosti (W/kg)

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We're working on a comprehensive educational guide for the Power-to-Weight Ratio (W/kg) in your language. The content below is shown in English.

What is Power-to-Weight Ratio (W/kg)?

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Imagine riding a bicycle up a steep hill. You are pushing as hard as you can, legs burning, heart pumping. Beside you, another rider breezes past effortlessly. They might not actually be stronger than you in terms of raw muscle power. Instead, they likely have a better power-to-weight ratio. This simple number, measured in Watts per kilogram (W/kg), is the great equalizer in cycling and fitness. It tells you exactly how much engine power you have relative to the size of the vehicle (your body) you are trying to move. Why does this matter in your daily life? If you only ride on flat bike paths, raw power is king. But the moment you hit an incline, gravity enters the picture. Gravity doesn't care about your absolute power output; it only cares about how much mass you are lifting up that hill. By calculating your power-to-weight ratio, you get a crystal-clear picture of your climbing efficiency. It helps you set realistic fitness goals, track your training progress, and understand why some rides feel like a breeze while others feel like pulling a sled. This calculator takes two simple numbers—your Functional Threshold Power (FTP), which is the maximum power you can steadily hold for about an hour, and your body weight—and gives you your magic W/kg number. Whether you are trying to keep up with your local weekend cycling group, training for a charity hill climb, or simply looking to shed a few pounds while maintaining your physical strength, tracking this ratio gives you the ultimate roadmap to smart, data-driven fitness.

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Vzorec

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f(x)Power-to-Weight Ratio (W/kg) = FTP (Watts) / Body Weight (kg) To find this, we take your steady-state hourly power (FTP) and divide it by how much you weigh. This simple math reveals your true engine efficiency when fighting gravity uphill.

Variable Legend

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SymbolMenoJednotkaPopis
WPower Output (Watts)—The raw energy you generate while pedaling, measured in watts. Think of this as your physical engine's horsepower.
FTPFunctional Threshold Power (Watts)—The absolute maximum power you can sustain for a steady, hard one-hour effort. It is the golden standard for measuring cycling fitness.
RateBody Weight (kg)—Your body weight measured in kilograms. This is the mass your leg muscles have to push against gravity when climbing hills.

How to Power-to-Weight Ratio (W/kg)

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  1. 1Find your Functional Threshold Power (FTP) in watts, which is the maximum power you can sustain for a steady one-hour effort.
  2. 2Weigh yourself to find your current body weight in kilograms. If you use pounds, simply divide by 2.2 to convert.
  3. 3Divide your FTP wattage by your body weight in kilograms to calculate your standard power-to-weight ratio.
  4. 4Use this W/kg value to benchmark your climbing ability, track your fitness gains over time, or compare your performance with friends fairly.

Worked Examples

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Example 1
Given:200W FTP, 80kg rider
Výsledok:2.50 W/kg

Meet Dave. He weighs 80 kg and can hold 200 watts of power for an hour. By dividing his 200W FTP by his 80kg weight, we find his power-to-weight ratio is 2.50 W/kg. This is a fantastic, healthy fitness level for weekend club rides and local bike path adventures!

Example 2
Given:300W FTP, 75kg rider
Výsledok:4.00 W/kg

Sarah is a highly trained amateur racer. She weighs 75 kg but produces a massive 300 watts of sustained power. Dividing her 300W FTP by her 75kg weight gives her a stellar 4.00 W/kg. She will easily breeze past most riders on steep mountain climbs!

Example 3
Given:150W FTP, 60kg rider
Výsledok:2.50 W/kg

Let's look at Emma. She produces 150 watts of power and weighs 60 kg. Even though her raw power is lower than Dave's (150W vs 200W), her ratio is also 2.50 W/kg because she is lighter. On a steep hill, Dave and Emma will climb at almost the exact same speed!

Example 4
Given:350W FTP, 70kg rider
Výsledok:5.00 W/kg

This is elite, domestic pro territory. A rider producing 350 watts at a lean 70 kg achieves a mind-boggling 5.00 W/kg. This level of physical efficiency requires dedicated, structured training and top-tier genetics.

Real-World Applications

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Comparing your cycling performance fairly with friends of different heights and weights.

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Tracking fitness improvements over a winter indoor training block.

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Planning energy pacing strategies for long, mountainous charity rides or gran fondos.

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Setting realistic weight loss goals that preserve muscle strength and athletic power.

Special Cases

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Extremely Light Riders

If you are a very lightweight rider (under 50 kg), you might have an incredibly high W/kg ratio but struggle on flat, windy roads where raw horsepower (absolute wattage) is needed to cut through the air.

Short-Duration Sprint Bursts

This calculator uses FTP (1-hour power). It won't accurately predict your performance for 10-second town-line sprints, which rely on explosive anaerobic energy rather than sustained aerobic threshold.

Heavy Bikes and Gear

Don't forget your gear! While the standard formula uses your body weight, adding a heavy steel bike, water bottles, and loaded panniers will lower your real-world system power-to-weight ratio on a climb.

Cycling Performance Benchmarks by W/kg

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Fitness LevelW/kg RangeTypical Application
Recreational Rider2.0 - 2.5 W/kgGreat for casual weekend group rides
Active Amateur3.0 - 3.7 W/kgLocal racers and strong club riders
Elite/Pro5.0 - 6.5 W/kgNational champions and Tour de France contenders

Frequently Asked Questions

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Q

How do I calculate power-to-weight ratio?

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To find your power-to-weight ratio, simply divide your sustained power output (in watts) by your body weight (in kilograms). For example, if you weigh 70 kg and can hold 210 watts, your ratio is 3.0 W/kg. This gives you a clear, weight-adjusted view of your true aerobic fitness.

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Why does power-to-weight ratio matter more than total power?

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Absolute power is great for flat roads, but climbing is a battle against gravity. Since gravity pulls harder on heavier objects, a lighter rider requires significantly less energy to go uphill. A higher power-to-weight ratio means you have more relative strength to fight gravity, leading to much faster climbs.

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How can I improve my power-to-weight ratio?

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You can improve this ratio by increasing your muscle power, reducing your body weight, or doing both simultaneously. Consistent interval training builds your cardiovascular engine to increase watts, while a balanced, nutritious diet helps you maintain a lean, efficient climbing weight.

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What are typical power-to-weight ratios for different categories of cyclists?

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Recreational riders typically sit around 2.0 to 2.5 W/kg, while dedicated amateurs often reach 3.0 to 4.5 W/kg. Elite amateur racers can push up to 5.0 W/kg, and world-class professional climbers in races like the Tour de France can sustain an astonishing 6.0 to 6.5+ W/kg on major mountain passes.

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How does power-to-weight ratio specifically impact climbing speed?

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When the road goes uphill, gravity becomes your main resistance. A rider with a higher W/kg ratio generates more upward propulsion per unit of body mass, allowing them to ascend faster with less effort. Even a small improvement of 0.2 W/kg can shave minutes off a long mountain climb.

Common Mistakes to Avoid

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  • !Mixing up pounds and kilograms when entering your body weight.
  • !Using your peak 5-second sprint power instead of your sustained 1-hour FTP power.
  • !Forgetting to include the weight of your bike and gear when planning a heavy bikepacking trip.
  • !Comparing your indoor trainer FTP directly to outdoor power without calibrating your power meter.
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Pro Tip

If you want to climb faster, focus on the easiest wins first. For a heavier rider, losing just 2 pounds of body weight improves climbing speed just as much as grinding through weeks of intense training to add 10 watts to your FTP. Balance smart training with healthy nutrition for the best of both worlds!

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Did you know?

Did you know that on flat ground, wind resistance is your biggest enemy, so raw power is all that matters? But once the road tilts upward past a 6% grade, gravity takes over completely. At that point, your body weight becomes the primary obstacle, making your power-to-weight ratio the single most important factor in how fast you reach the top!

📖Difficulty:Beginner
Deep Dive

Read the full guide on how to use this calculator effectively

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Reviewed October 2026
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