# Bike speed calculator power

This cycling wattage calculator is a tool designed for all cycling passionates. With its help, you can explore the relationship between the power you produce and various parameters such as speed, biking position, hill slope, or pavement type. For example, you can find out how much power you can save when switching from knobby to slick tires. Thanks to this cycling power calculator, you will finally be able to compare two cyclists with fundamentally different styles - for example, a road cyclist who never gets off his slick-tired bike, and an MTB-enthusiast who enjoys hardcore off-road adventures.

Cycling wattage is the power you produce with your legs to get your bike going and, preferably, going fast. You can think of it as the ultimate measure of your biking skills: the more power you can produce, the better cyclist you are.

The cycling power is measured in Watts.

One Watt corresponds to one Joule of energy produced every second. Our cycling wattage calculator is based on the model described in detail in the paper "What is slowing me down?

Estimation of rolling resistances during cycling". It assumes that the power you produce is equal to the sum of resistances you need to overcome, multiplied by your speed. Additionally, we take power losses into consideration. In the next sections of this text, we will look at each component of this cycling power equation in more detail. If you're cycling uphill, you need to overcome the force of gravity. Naturally, if you're going downhill, the gravity will actually help you, making you accelerate without any additional effort.

The next factor that will undoubtedly slow you down is the friction between your tires and the surface. The smoother the road and the slicker your tires, the less friction you will experience.

The estimates for the rolling resistance coefficient Crr in our cycling wattage calculator are based on the findings of researchers from the University of Pretoria and the University of Reims Champagne Ardenne :.

The third component of the power equation is the aerodynamic drag. It's a force of air resistance. Unlike the previous two components, it's dependent on your speed raised to the second power - the faster you are, the higher the air resistance. It means that the faster you go, the more difficult it is to keep speeding up.

We are using the values suggested by Asker E.Spoke length calculator Drives Companies Stainless steel spokes bicycle. Other travel parameters are set for typical electric bike, that is: Rolling resistance : 0. If you have already estimated what should be the parameters of the drive you are interested in, you may try to search for it in our drive catalog.

Check spokes offers on e-spokes. Comments - 12 Bartek. Will you please tell me the formula of these calculations. When I using watt bldc motor. What can I do. Please answer. In the comments under the simulator you have an exact formula for calculating rolling and air resistance.

Dear Bartek How to calculate the Power of the motor? As i am planning to increase the speed of the motorcycle to 80 to kmph. So kindly explain how to calculate. Roman Van Loo This calculator does not matter the size of the wheel.

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Smaller wheel - lower speed - lower power required. Driving parameters Total weight Rolling resistance Aerodynamics coefficient Face surface. Add your company If you are a seller or manufacturer of electric drives for bikes, you can publish the information about your company and drives in our catalog. Registration and adding of drives is free of charge.

## How to Calculate Cycling Power

Partners Contact us. This calculator allows to estimate what should be the minimum drive parameters to obtain the assumed speed and range of electric bike. Suggested minimum parameters of drive: Engine power:.This calculator is based on the theory of the Secret of Cycling.

The calculator is composed of three parts. The first part is about your human engine your power and weight and the parameters who determine this like training. The second part is about the cycling performance that you want to achieve and the parameters who determine this like air resistance and climbing resistance.

At the third part you can make your own calculations on the achievements of top cyclists or other cyclists. Depending on your choice you will immediately see a number of subtabs. This problem will be solved as soon as possible. Your cycling power How fast are you in different circumstances? Your FTP equals the total power in Watts divided by your weight in kg.

Enter your body weight and FTP at the next tab. Enter your bodyweight and FTP. The attainable speed decreases slowly with time. Also the attainable speed of elite cyclists is shown.

Sprinters have a larger decline of the speed with time than all-round cyclists.

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The decline of endurance cyclists is even less. The previous tab was meant for all-round cyclists. If you are a sprinter or an endurance cyclist, you can see the impact. Enter below what kind of cyclist you are. Your performance peaks around the age of 30 years and is less if you are younger or older. Enter your age below. Your performance-index indicates at what percentage of the elite-runners you are cycling.

Corrections are made for age and sex. Your FTP is inversely proportional to your body weight. Especially in the mountains your weight is a large determinant of your FTP The table shows the effect of a 5 kg weight loss or weight gain.

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You can also adjust your body weight and look at the differences. Your FTP is greatly influenced by training. Your FTP may increase by 2. At higher altitudes the thin air limits your oxygen uptake and lowers your FTP.Updated January 17, Cyclists: here you will find three 3 graphs for watts vs. The live version of this file has been moved to: Cycling Performance Simplified.

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Links to calculators for speed to watts are found at the very bottom but are also copied immediately below for your convenience:. This is our very own power to weight, watts to speed, and estimated time to terminal velocity bare bones calculator. Bicycle Power and Speed Calculator A more detailed watts to speed calculator. Once there, click on the image of the calculator, and be aware that the process is a little overly complicated.

We both ride nice road bikes with no aero-bars Also be aware that I have read a report by somebody who ran a Powertap and SRM simultaneously on a trainer and found the SRM reported about 20 watts higher. That is not really a problem since both systems are reliable and repeatable. Cycling Power while Climbing Calculator hills and power. Links to original source materials are also at the bottom of this page.

### Electric Bicycle Calculators

The page you are now on was originally begun in July of during my own search which was probably similar to yours that brought you here today. Since I have worked out the details to my own satisfaction, and this page remains part of the history of the search and testing which was formalized into the book:. Cycling Performance Simplified.

Below is the original version of this page that you are now on as it was first published here in I hate to waste everybody's time by not providing the simple answer, but maybe somebody will know it, or know where to find it. I am sure there is a formula amenable to plugging into a spreadsheet to answer the following question:. I have a modern bicycle with appropriate components for competition, and I dress and ride more or less appropriately, and I know enough to get in the drops.

I am a certain weight. How many watts equals an average of how many miles per hour over a flat windless course? I have seen numerous references to this concept, and lots of side issue charts and graphs, but I'm telling you, my friend, somewhere there is a simple answer to this with at least as much veracity as the rule of thumb for HR, which is minus your age I explained it to Mary thus: "Look, it's a simple concept. Everybody, and every ride, and every bike, and every wheel, and every day, and every pedal, and every jersey, and every helmet, and every rider is different.

I give you that. But there are absolutely no riders who are ten feet square weighing 10, lbs. Plug in your numbers. Bikes, components, clothes, and weight are pretty much minimal for making this calculation. The only significantly strong variable is the air resistance.

Air is elastic, and the problem is that the harder you push it, the harder it pushes back. However, it doesn't push back harder in some willy-nilly any-old-way fashion. It increases its push back in a regular and predictable manner, so you would think the first thing off everybody's lips who has anything resembling a discussion about this would be the exact logarithmic constant for how it does that.

But no Otherwise, everybody is rather reluctant to give you specific information about just how much faster that equipment is likely to make you.

Once a long time ago this isn't a totally new quest for meI had a conversation with a sales rep for Mavic about their then new Kyserium's. It went like this, "Really, those little cutouts make the wheels a lot faster? Could I see the wind tunnel specs?For coast-down simulations, set the Power value to zero and the Slope to the desired negative value. Last modified: BMI calculator. Anglo-american units. Streamlined Trike Quest. The comma as well as the point may be used as decimal point.

Pedaling Cadence. Recumbents: calculation is based on 20inch front wheels. The input field of the variable to be calculated must be empty.

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The result will appear in that field. With both fields filled, the variable evaluated previously will be calculated again facilitates quick comparisons. Your browser doesn't support JavaScript, or JavaScript has been disabled. In case you enter before clicking the "Calculate"-Button :. Besides, the program will evaluate the variable whose fields are empty Trip Distance or Trip Duration, respectively. The rider's frontal area is evaluated approximately from the rider's body height and weight, and a parameter which depends on the selected kind of bicycle see FAQ.

These assumptions yield good matches with frontal area measurements, and with measurements done with SRM Power Measuring cranks. Inside the fully streamlined bicycles, of course, the rider's frontal area is assumed to have no influence. The rolling frictions of the front and rear wheel tires each are taken into account separately.

At wider tire tends to generate less rolling friction but more air resistance not true with the streamliners White Hawk and Quest whose fairings enclose the wheels almost entirely. A thicker tire wall touring tire tends to generate higher rolling friction. Tire thread induces air vortices and thus speed-dependent additional resistance.A power meter can provide an extremely accurate measure for gauging the intensity of your workout, but it's also an extremely expensive gadget.

Unless you are training hard and seriously for a cycling race, triathlon or other event, this tool is really more of a luxury than a necessary workout aid. Still, it's nice to know how cycling power works.

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Utilize cycling power estimates to gain an idea of how much power in watts you are generating. At Use these averages: 95 watts for 14 mph, watts for Approach your calculation a different way if you are trying to determine how many additional watts you need to gain speed increases.

If you are expending 75 watts and traveling 20 kmh, or However, this is not a linear equation.

### How to Calculate Cycling Power

Instead, the increases in power you need to increase each 2. The numbers are progressively bigger because the power you need to overcome wind resistance increases with the square of the velocity, according to the Road Bike website. To convert your kilometers per hour to miles per hour, divide the kmh by 1. Disregard both of these formulas if these conditions are not exact: You are riding on a flat road on a day when there's no wind. Avoid using simple power output formulas to plan training sessions.

Even in these ideal conditions, other factors will affect your true power output. These include how much your bike weighs, your weight, your positioning on your bike and the air temperature. Other factors that come into play include your wheel diameter, crank length and gear ratio. When you divert from the ideal conditions, the grade of the road you are on and wind have an impact on your power output versus speed.

The best way to gain a precise measurement of your power output is to use a power meter. Health Family Health Womens Health. Linda Tarr Kent. Her area of expertise is health and fitness. She is a Bosu fitness and stand-up paddle surfing instructor.

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Kent holds a bachelor's degree in journalism from Washington State University. Calculating cycling power is a complicated process due to numerous variables. Step 1 Utilize cycling power estimates to gain an idea of how much power in watts you are generating.Choose temperature, altitude, tires, CdA, drivetrain efficiency and calculate the speed for a given power output.

The speed of a cyclist depends on a number of factors. In order to move at a certain speed, a cyclist has to overcome a number of forces. In most riding scenarios the aerodynamic drag accounts for the largest part of these forces. It is followed by the gravitational forces, the rolling resistance of the tires and mechanical losses of the drivetrain. In recent years the importance of aerodynamics was recognized by most professional and many amateur cyclists.

Back in Greg Lemond beat Laurent Fignon in the final stage time trial of the Tour de France by 58 seconds using an aerodynamic helmet and aerobars. These 58 seconds were enough to win the Tour with a time advantage of only 8 seconds. At the same time this dramatic final stage proved the advantage of an aerodynamic position and equipment to a large audience. The main factors of aerodynamic drag are the air density which depends on temperature and altitude and of course the size and shape of the cyclist and his bike.

To define the latter the drag area CdA is commonly used. CdA stands for the product of the frontal area of rider and bike, named A, and the drag coefficient c d often also c w.

Ignoring the other resistances for the moment, the power needed to overcome the aerodynamic drag is calculated by:. The CRR coefficient is commonly used to characterise a tires rolling resistance.

Here I strongly recommend you to take a look at the website www. Again, ignoring the other resistances for the moment, the power needed to overcome the rolling resistance is calculated by:.

## Calculate 60' 1/8 & 1/4 Mile ETs & Trap Speed From Horsepower

Here the number 9. Furthermore note, that this formula is only correct on a level track, since only in this case the gravitational forces are directed entirely towards the road. Most powermeters measure the power at the front chainrings or the pedals. As mentioned in the section about the rolling resistance the calculator above assumes a perfectly level track.

Therefore, the gravitational forces only appear in the rolling resistance part of the overall speed calculation. For the sake of completeness, I would like to mention the gravitational forces, which act when riding up or down a hill.