Please return my money
This app shows an rpm reading when there is complete silence… useless at best, inaccurate out of the box…
$1.99
About
Instantly measure engine RPM by listening to its sound through your phone's microphone. No external sensors or adapters needed. Ideal for diagnosing and monitoring various engines hands-free.
✓Instant RPM reading from sound
✓No OBD adapter or sensors required
✓Supports 1-12 cylinders
✓2-stroke or 4-stroke cycle selection
✓Auto-Freeze for hands-free use
✓Manual Freeze/Resume button
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What's New in MyRPMCalc
1.0
July 31, 2026
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FAQ
How does MyRPMCalc measure engine RPM?
MyRPMCalc analyzes the fundamental firing frequency of an engine's sound through your phone's microphone. It calculates the RPM based on this acoustic analysis, providing a live reading.
What types of engines does MyRPMCalc work with?
MyRPMCalc is designed to work with a wide range of engines, including cars, motorcycles, lawn mowers, generators, chainsaws, go-karts, and boats. It supports engines with 1 to 12 cylinders and both 2-stroke and 4-stroke cycles.
Can I use MyRPMCalc by myself to check RPM?
Yes, MyRPMCalc features an Auto-Freeze function that allows for hands-free operation. You can set a delay for the reading to freeze, enabling you to rev the engine and then check the RPM without needing a second person.
Is MyRPMCalc accurate for critical engine tuning?
MyRPMCalc provides an estimate of engine speed acoustically and is not a certified or calibrated tachometer. Factors like background noise and exhaust modifications can affect accuracy. Always refer to official manufacturer guidance for safety-critical decisions.
Does MyRPMCalc have ads or subscriptions?
No, MyRPMCalc is designed to be simple and clutter-free. It does not contain any advertisements, subscriptions, or require accounts for use.
What devices does MyRPMCalc support?
MyRPMCalc is currently available for iPhone devices. The app processes audio entirely on your device for privacy.
How often is MyRPMCalc updated?
MyRPMCalc was last updated on July 31, 2026, with version 1.0. Future updates will likely focus on improving accuracy and compatibility based on user feedback.
What is the price of MyRPMCalc?
MyRPMCalc is a paid application priced at $1.99. This one-time purchase grants you full access to all its features without any ads or in-app purchases.