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Free online model rocketry tools and calculators

A growing collection of free, browser-based tools for model rocketry and high-power rocketry. Design 3D printable nose cones and couplers, calculate altimeter vent holes, predict apogee, size black powder ejection charges, estimate recovery drift and parachute descent rates, check body tube strength and fin flutter, generate laser-cut parts, plan visibility and tracking, read USB serial data from altimeters, and more. You'll also find tools built specifically for our altimeters and hardware: firmware updater, USB WiFi configurator, flight data downloader and device diagnostics. All tools run in the browser. Nothing to install, no account required for most features. Metric and imperial units throughout.

Featured tools

★ Featured

Firmware update

Update or restore your firmware on your altimeter using our handy online web tool.
V1.2
★ Featured

Flight log upload

You can upload your Nano flight logs here using our secure upload tool. Any edited flight logs will be rejected so we only host genuine as flown logs.
V1.1
★ Featured

Online USB Portal

Use our online USB data reader to grab quick flight summaries from devices, or your WiFi passwords if you can't remember it.
V1.0
★ Featured

Online USB WiFi configurator

This tool can set your altimeters WiFi settings via a USB cable from your browser with ease.
V1.1

All tools

3D parts tool

A tool to generate some handy 3D parts for model rocketry needs.
V1.0

Air hole calculator

Calculate the correct vent hole size for your rocket body tube based on diameter, length, and number of holes.
V1.0

Altimeter Cloud API

You can use some of the altimeter cloud via API should you need to.
V1.0

Altitude Predictor

Predict your rocket's apogee altitude based on motor thrust, mass, drag coefficient and atmospheric conditions.
V1.0

Body Tube Strength Calculator

Calculate the axial buckling strength of your rocket body tube based on dimensions and material.
V1.0

Descent calculator

Calculate parachute and streamer descent rates, times and velocities for your rocket recovery system.
V1.0

Ejection Charge Calculator

Calculate the amount of FFFFg black powder needed for your rocket's ejection charge based on airframe dimensions and desired pressure.
V1.0

ESP web programmer

Write, edit, compile and upload ESP32 code right here on our website hassle free. It just works!
V1.0

Fin Flutter Speed Calculator

Calculate the maximum safe airspeed before destructive fin flutter based on fin geometry, material and flight altitude.
V1.0

Flight log verification

You can check your Nano flight logs here to ensure they are genuine and unchanged from when the Nano wrote the file using the integrated security features.
V1.1

Laser Cut Parts Designer

Design bulkheads, centering rings and fins for laser cutting. Export as DXF or SVG with real-world dimensions.
V1.0

Rail Exit Velocity Calculator

Calculate the speed your rocket leaves the launch rail and whether it will be stable in current wind conditions.
V1.0

Recovery Drift Calculator

Estimate how far your rocket will drift during descent based on altitude, descent rate and wind speed.
V1.0

Visibility & Tracking Calculator

Estimate the maximum altitude and distance at which you can visually track your rocket during flight.
V1.0