EGODRIFT Headspeed Calculator v1

Whether you're selecting the ideal motor for a new project or refining an existing setup, the EGODRIFT Headspeed Calculator helps you determine a suitable combination of motor Kv, gearing and throttle percentage for your desired headspeed—while explaining the reasoning behind it.

Unlike many traditional headspeed calculators, our goal wasn't simply to provide another calculation tool. We wanted to create a resource that combines the mathematics with the experience we've gathered over years of designing motors and helping customers optimize their power systems.

The calculator is completely free to use, runs directly in your browser on desktop and mobile devices, and can even be added to your home screen for one-touch access. You can also save or share your configurations via a simple link, making it easy to discuss setups with friends, clubs or customers.

The Philosophy Behind It

Most headspeed calculators answer the question: “What headspeed will I get?”

We wanted to answer the equally important question:

“Is this actually a good setup?”

For that reason, the calculator doesn't just perform the calculations. Throughout the Workbench, you'll find explanations covering motor Kv, gearing, governor headroom, battery voltage, drivetrain efficiency and many of the small details that can make the difference between a setup that merely works and one that performs consistently and efficiently.

Our aim is to make years of practical experience accessible to anyone—whether you're building your very first model or optimizing an existing one.

Why 3.8 Volts per Cell?

One of the first things you'll notice is that the calculator fixes the Voltage per Cell value at 3.8 V.

This is a deliberate decision.

While calculations based on a fully charged battery may look impressive on paper, they rarely represent the conditions under which a model spends most of its flight. Using 3.8 V per cell produces results that are much closer to real-world operation while naturally accounting for battery voltage under load, drivetrain losses and overall system efficiency.

To provide additional context, the results section also displays calculated rpm values for 3.7 V, 3.85 V and 3.9 V per cell. This allows you to estimate the expected headspeed throughout the flight—from nearly empty packs to freshly charged HV batteries, as well as applications such as Scale and F3C.

Why 80% Throttle?

The calculator also defaults the Throttle / ESC Output to 80%.

Again, this is intentional.

Most governed electric setups operate most effectively when the ESC has sufficient headroom to regulate speed without constantly reaching its limits. Around 80% is generally a very good starting point for achieving stable governor performance while keeping the motor operating efficiently.

If your desired headspeed can only be reached with substantially higher or lower throttle values, it's often worth reconsidering the motor Kv or gearing rather than simply moving the throttle slider.

Quick Access on Mobile

Open the calculator page in your phone's browser and use the browser menu—the three dots on Android or the Share button on iPhone—to add or install it on your home screen. This creates a shortcut icon on your phone and gives you direct access to the Headspeed Calculator without requiring a separate app.

You can also save or share your current setup directly from the results block. Use Share Configuration to send it through your phone's sharing options, or Copy Configuration as Link to save the setup as a URL and return to exactly where you left off.

Part of the EGODRIFT Workbench

The Headspeed Calculator is one of the first resources in the new EGODRIFT Workbench.

The Workbench is designed as a growing collection of technical resources, setup guides and practical tools that share the knowledge we've gathered over the years and help you get the most out of your setup.

We hope you find it useful, and as always, we'd love to hear your feedback and ideas for future improvements.

Try the EGODRIFT Headspeed Calculator →