Motorcycle rear wheel horsepower calculator. Uncover the key to optimising your ride's power output.

Motorcycle rear wheel horsepower calculator 1/4 mile speed and ET. 15 for rear-wheel drive, and . Understanding this distinction is critical for us as vehicle enthusiasts, tuners, or anyone involved in the automotive industry. Enter wheel horsepower and drivetrain loss to get true engine horsepower for FWD, RWD, or AWD. The drive train loss is . The drivetrain loss can be used in the formula. Enter the engine power of your vehicle in horsepower (HP). What Is Drivetrain Loss? Jun 9, 2023 · The Crank to Wheel HP calculator is a simple yet practical tool that estimates the horsepower at the wheels from the crankshaft horsepower. This calculator estimates your quarter mile elapsed time (ET) when given the weight of the car and flywheel or wheel horsepower. Drag Performance Calculator By AssassinRacing. It is an essential tool for automotive enthusiasts, mechanics, and engineers who need to understand the performance output of a vehicle’s engine and its transmission to the wheels. *Note: Assuming a 20% drive train loss. Whether you’re working with wheel HP for drag racing calculations or simply curious about power output, this calculator is a must-have for precise tuning and performance analysis. Crank to Wheel Horsepower (CWHp): The horsepower effectively transferred from the engine to the wheels of the vehicle, taking into account power loss. By understanding WHP, car enthusiasts, racers, and engineers can better gauge vehicle performance and make informed That % loss can vary based on many things, but some of the biggest variables are whether the bike is driven by chain, belt, or drive shaft. When you’re done, hit the drivetrain horsepower loss guestimator to run your own numbers and find out how much power your car is actually putting down. Our WHP to HP Calculator is a simple and efficient tool designed to help you calculate the engine’s horsepower based on WHP and drivetrain type in just a few clicks. Enter the weight of your vehicle in pounds (lbs). Power Loss Percentage (L): The percentage of power loss due to factors such as friction, heat, and other mechanical inefficiencies. For front-wheel drive, the drive train loss is 10%, for rear-wheel drive, it is 15%, and for all-wheel drive, it is 25%. Whether you're evaluating vehicle specifications, comparing motor outputs, or designing mechanical systems, our calculator delivers instant horsepower conversions and calculations without complex equations. Free online whp to hp calculator – Convert wheel horsepower to horsepower. For example, a tire size of 120/70-17 can be broken down as follows: TCI Auto offers you an array of Automotive Racing Calculators allowing you to figure out displacement, Horsepower, Quarter Mile Times, and more! This guide breaks down the difference between crank and wheel horsepower, how drivetrain loss works, and why your dyno numbers never match the spec sheet. For a more accurate calculation try Larry Meaux's HP, ET, SPEED CALCULATOR This data is intended to assist our customers in understanding the relationship between vehicle HP and weight vs. 1/4 Mile MPH Calculator by RPM, Tire Height, Rearend Ratio, Trans Ratio, & Converter Slip 1/4 ET/SPEED/HP/KW Calculator Weight is as the car sits on the line: driver and gas in it. Jul 3, 2025 · Enter your engine horsepower (HP) and wheel horsepower (WHP) to see the drivetrain loss percentage and an estimate of your drivetrain type. 2. Select your vehicle’s drivetrain type from the dropdown (Front-Wheel Drive, Rear-Wheel Drive, or All-Wheel Drive). Formula The formula below is used to calculate engine horsepower (hp) from wheel horsepower (WHP). This conversion utility was jointly developed between FrozenMist and www. Uncover the key to optimising your ride's power output. Fast, simple, and accurate. The HP is based on flywheel HP, for rear wheel HP multiply the results by your drive train percentage loss and subtract it from the result. Your primary drive, transmission and rear drive sprockets all combine to determine your cruising rpm as well as your final top speed. Ducati quotes 160HP stock so I am trying to get an idea if I am at least The lower the chain revolutions, the more frequently each chain link engages the same sprocket tooth, so greater and more uneven the wear. This conversion is particularly helpful for automotive enthusiasts, mechanics, and anyone dealing with vehicle performance metrics. Calculator will generate its rear wheel horsepower. mk5cortinaestate. Does HP stand for horsepower? Yes, in the field of auto mechanics, HP stands Its difficult to show crank horse power from a dyno because a dyno cannot properly assume all things that cause power train loss. Input the Weight and 1/4 mile Trap speed of your vehicle. Change your HP and/or vehicle weight numbers and check the results. This measurement is important for assessing the actual power reaching the wheels, which differs from engine horsepower due to mechanical losses. co. Oct 1, 2024 · The Drivetrain Loss Calculator measures the percentage of power lost between the engine and the wheels due to friction and inefficiencies in the drivetrain. It is honest, true, fair and duplicable. What are common drivetrain loss percentages? Front-Wheel Drive (FWD): 10% Rear-Wheel Drive (RWD): 15% All-Wheel Drive (AWD): 25% This calculator simplifies converting wheel horsepower to engine horsepower, helping you understand your vehicle's true 89650 $22. Accurate calculations for front-wheel, rear-wheel, and all-wheel drive systems. This calculation is crucial for understanding the performance of your vehicle, whether it’s a Rear-Wheel Drive (RWD), Front-Wheel Drive (FWD), All-Wheel Drive (AWD), or 4-Wheel Drive (4WD). Also provided is a converter for common units of power. The Built Bottom End Performance horsepower calculator will calculate your engine's wheel (whp) and crank (chp) horsepower using proven mathematical functions based on real-world examples. 10 (10%) for front-wheel drive, . This program will give you an estimate of the horsepower produced by your bike if you know the weight of the bike, a quarter mile ET (elapsed time) and the quarter mile speed in miles per hour. Estimate your drivetrain loss and calculate your engine's wheel horsepower using our simple calculator. 15 = 690 If you want 600 wheel horsepower you need a turbo that can support 690 crank horsepower. Apr 30, 2020 · For this example we are going to start with a wheel horsepower target of 600 for a rear wheel drive application. If you want to test crank horsepower, you have to attach the engine to a dyno that tests from the crank. Great for cars, bikes, and tuning. Simply put, crank horsepower isolates the engine, so you can know how much horsepower the engine alone generates without the drivetrain or any modifications. HP is at Flywheel The standard formula for converting WHP to HP is: HP = WHP / Drivetrain Efficiency. Jan 9, 2024 · The rwhp to hp Calculator is a valuable tool used to convert rear-wheel horsepower (rwhp) into regular horsepower (hp). HP = WHP * 1 / (1 – DL ) Where HP represents engine horsepower WHP is wheel horsepower DL represents drive train loss For front-wheel drive, the drive train loss is 10%; for rear-wheel drive, it is 15%; and for all-wheel drive, it is 25%. Mar 1, 2025 · A WHP to HP Calculator is a tool used to estimate a vehicle’s engine horsepower (HP) based on its wheel horsepower (WHP) and drivetrain type. This calculator estimates your 60 foot, eighth and quarter mile elapsed times and trap speed when given the weight of the car and flywheel or wheel horsepower. A 17% driveline loss is assumed for flywheel HP. Jan 14, 2012 · How to calculate RWHP vs Crank HP There is no magic formula, because there are just too many variables. Some include gearing, condition of lubricants, mass of rotating parts, manual or automatic transmission and a few others. It is the ONLY standard that can be duplicated by the entire industry - regardless of the dyno manufacturer. 99 Prop 65 Warning Power-Speed Calculator Qty Add to Cart Add to Wish List The Wheel Horsepower Calculator is a useful tool for calculating your car's wheel horsepower based on factors such as engine power, gear ratio, tire size, drive train type, and the number of driven wheels. This calculator is based on Naturally Aspirated applications. This tool accounts for power losses that occur through drivetrain components, providing accurate performance metrics for vehicles. com Calculate the theoretical 1/8 Mile ET, 1/4 Mile ET, 1/4 Mile Top End Speed, and Ideal 1/4 Mile Gear Ratio for a given application based on the Vehicle Weight (in pounds), Vehicle Horsepower (at the flywheel), RPM through lights (finish line), and Tire Diameter (Height) in Inches. Free Wheel Horsepower calculator. Mar 27, 2025 · Want to convert WHP to HP easily? Our WHP to HP Calculator helps you estimate your vehicle’s crank horsepower based on wheel horsepower and drivetrain type. Determine the horsepower delivered to the wheels from the engine with our wheel horsepower calculator. [whp] Since I got whp readings I am curious to know the approximate drivetrain losses in percentage to calculate how much whp would a 50 bhp bone stock machine make. Sep 11, 2025 · Enter the engine horsepower and select the drive system to determine a car's wheel horsepower. When changing sprockets, you can adjust Chain Links to maintain (nearest to) current Sprocket Centers (eg: to keep motorcycle rear wheel within adjustment range). While WHP represents the power reaching the wheels, HP accounts for drivetrain losses, providing a more accurate picture of an engine’s full capacity. Usually, you will see a 15% loss from crank hp to rwhp on a manual This free calculator determines horsepower as a unit of power given force, distance, and time. Jan 18, 2024 · FAQs How do you convert HP to WHP? To go from horsepower to wheel horsepower, you’ll need a calculator to know how your car’s drivetrain works. Use our WHP to HP Calculator to easily convert Wheel Horsepower (WHP) to Horsepower (HP). Aug 10, 2011 · I have noticed that manufacturers claim 50 brake horsepower [bhp]output and that is something very different from wheel hp. Simply enter your Wheel Horsepower (WHP), select your drivetrain type, and get the HP conversion instantly! Convert WHP to HP in seconds. Oct 1, 2025 · Enter the Brake Horsepower and percentage of power loss into the calculator to determine the Crank to Wheel Horsepower. Engine horsepower (HP) represents the raw power generated by the engine, wheel horsepower (WHP) indicates the usable power that reaches the wheels after accounting What is Horsepower Calculator At Horsepower Calculator, we provide accurate and intuitive tools to measure engine power and performance. When you choose horsepower, this calculator will measure the approximate horsepower of an engine based on the torque of the engine (measured in foot-pounds) multiplied by the RPM of the engine, divided by 5,252 (conversion between foot-pounds and horsepower). This distinction is valuable in automotive tuning and performance assessment, especially for comparing engine power Apr 28, 2018 · Explore motorcycle horsepower performance with a focus on "effective horsepower" measured at the wheel. 4. Sep 14, 2025 · Motorcycle enthusiasts and car tuners can utilize the rear wheel horsepower calculator or wheel HP to crank HP calculator to optimize performance. Click the “Calculate” button to determine the wheel horsepower (WHP). Essential for understanding vehicle performance and drivetrain efficiency. Compare different tire sizes and find compatible options for your motorcycle. Then enter the total weight of your vehicle, as raced, including the drivers weight. That way I can compare the results! Our handy motorcycle tire size calculator helps riders compare tire sizes including tire’s width, aspect ratio, construction type, and rim diameter. Check Lock Centers and adjust sprockets - Chain links will adjust to maintain nearest to Dec 5, 2024 · The WHP to HP Calculator helping in converting wheel horsepower to crank horsepower, offering a complete view of engine output. and its 1/4 trap speed. Oct 3, 2024 · Use the formula: \ ( HP = WHP \times \frac {1} {1 - DL} \), where DL is the drivetrain loss. It is impossible to calculate these values accuratly, this information should be used as a rough guide only. Feb 8, 2025 · The WHP (Wheel Horsepower) to HP (Horsepower) Calculator is a useful tool which is designed to convert wheel horsepower (measured at the wheels) into crank horsepower (measured at the engine’s crankshaft). Brake Horsepower (BHp): The total horsepower before power loss. Jul 11, 2024 · How to Use the Drivetrain Loss Calculator: 1. WHP to HP Calculator The calculator will convert wheel horsepower (WHP) to engine horsepower (EHP) and vice versa, based on the drivetrain loss percentage, and show detailed calculations. Apr 25, 2025 · In the realm of automotive performance, the terms “wheel horsepower” (WHP) and “crank horsepower” (CHP) frequently arise, denoting different measurements of a vehicle’s engine output. Testing from the crank is completely pointless anyways, because of drivetrain losses, thats why rear wheel horsepower is what dynos test for anyways. T. May 31, 2020 · The higher the torque at the rear wheel, the faster you can accelerate (theoretically as at some point the wheel will start slipping of course) but you’ll reach the engine’s max RPM quicker, so your motorcycle’s top speed would be lower (leaving gears out of the discussion for simplicity). Formula To calculate the Engine Horsepower (HP) and Brake Horsepower (BHP) from Wheel Horsepower (WHP): Free Horsepower Calculator Engine Rear Wheel Horsepower Calculator Based on total vehicle weight and 1/4 mile MPH To use this horsepower calculator enter the mph trap speed at the 1/4 mile mark from one of your dragstrip ET slips. Not a substitude for actual testing. Nov 14, 2024 · The Wheel Horsepower Calculator can convert engine horsepower to wheel horsepower, accounting for power lost through the drivetrain. Nov 15, 2007 · Hey Guys, Ducati Miami dynoed my bike while trying to fix an issue and said they got a max HP of 142 at the wheel Does this sound right?? My only performance mods are the Termi Slip On Kit (With ECU and Airfilter). Nov 16, 2025 · Motorcycle speed and sprocket calculator with bike database for gearing, sprockets, tires and chains of over 1900 bikes. Simply input your wheel horsepower value and select drivetrain type then click the calculate button. Free online hp to whp calculator – Convert horsepower to wheel horsepower. What is crank horsepower? Feb 14, 2025 · Calculate precise wheel torque for cars, motorcycles, and machinery using the Wheel Torque Calculator. How It Calculates the Results: The Calculate and convert motorcycle tire sizes with our easy-to-use calculator. Estimate Your Horsepower! *Note: Assuming a 20% drive train loss. In order to find a turbo that can support our target power we need to calculate for the drivetrain loss and multiply 600 x 1. When we discuss horsepower, we’re often fascinated by the sheer figures Mar 4, 2021 · Wheel horsepower is the amount of power an engine generates when connected to the drivetrain, measured at the wheels. This hp to whp calculator use WHP = Engine HP × (1 – (Drivetrain Loss / 100)) formula to measure the actual power output delivered to the wheels of a vehicle. If your bike made 120 hp at the crank and 100 hp at the wheel (16. Sep 10, 2025 · To calculate the HP from WHP, multiply the wheel horsepower by 1 divided by the result of 1 minus the drive train loss. This calculator will show you your speed in each gear from everything from a stock bike to an all out drag bike with a separate jackshaft as well as the one we love the most, the Bonneville racer. Calculator, You supply the Weight and Horsepower. The engine’s power output is typically higher than the power delivered to the wheels due to drivetrain power losses. Request yours to be added as well. Information about motorcycle horsepower, torque, acceleration, and speed. Simply input the horsepower value and select the drivetrain type then click the calculate button. Convert engine horsepower to wheel horsepower based on drivetrain type. 67% loss), then you should expect that it makes 132 bhp at the crank if it makes 110 hp at the wheel. uk to aid you in configuring your vehicle to get the most out of it. 25 for all-wheel drive. 3. The big end is where it's at! Use our free online Horsepower Calculator to estimate engine power using torque and RPM. True Rear Wheel Horsepower (tm) is Factory Pro's standard of measuring the power that is actually delivered to the rear wheel. This calculator can also evaluate any of the variables given the others are known. . E. Whether you’re comparing dyno results or planning performance upgrades, accurately converting Wheel Horsepower (WHP) to Engine Horsepower (HP) is essential. 2 days ago · Estimate Horsepower from Head AirflowBack to Calculators Index These equations are for recreation only.