Best Rpm Calculator Apps

Belt & Pulley Calculator

Setup two pulley system

$0.99

Calculate key parameters for a two-pulley system. Input pulley sizes, speed, power, and distance to determine belt velocity, tension, torques, wrap angle, and driven pulley RPM. Supports both imperial and metric units.

Strobe tachometer (RPM meter)

+ Laser Tachometer + Magnetic

Free

Measure rotational speeds of objects using your phone's flashlight, laser, or magnetic sensor. Detect precise RPMs with adjustable flicker frequencies and a wide measurement range. Ideal for analyzing fan speeds, engine RPMs, and more.

Camera RPM Meter - StrobeLight

Camera Tachometer - RPM Meter

Free

Measure rotational speed using your phone's camera or a simulated strobe light. Simply mark the rotating object and adjust the settings until it appears stationary to get an accurate RPM reading. The app also functions as a torchlight.

RPM Meter for Turntable

No fuss Tachometer

Free

Easily measure the actual RPM of your turntable with this straightforward tachometer. It provides detailed readings including minimum, maximum, and average RPM, along with percentage discrepancy and wow and flutter measurements.

Spicer Tool Kit

by Dana Limited

Free

Perform a variety of calculations related to vehicle drivelines and engines. This tool helps users get the most out of genuine Spicer parts with specialized calculators for RPM, fuel savings, and more.

Rpm Meter: Calibrate Turntable

Check Speed and Error

Free

Measure the speed of any rotating object with precision using your phone's gyroscope or camera. View real-time RPM data on a live gauge and graph, save your measurements, and compare historical readings. Ideal for calibrating turntables and testing various rotating equipment.

AutoCal: Automotive Calculator

by Darwish alneyadi

Free

This utility app consolidates numerous automotive calculators into a single platform. It offers tools for calculating RPM, speed, differential gear ratios, engine compression, displacement, tire size, and pulley ratios, with more features planned.

Speedometer»

Speedometer with large display

Free

This application displays your current speed in miles per hour, kilometers per hour, or knots. It features a large, clear display with Retina support for optimal visibility. Accuracy is enhanced by adjusting indicator transparency.

Moto Gear Ratio Calculator RPM

Sprocket Speed Shift Analyzer

$1.99

Calculate motorcycle speed at any RPM, visualize shift points, and compare sprocket combinations. This tool helps riders and mechanics optimize gearing with interactive gauges and detailed reports.

SoundTach

RPM from Engine Sound

Free

Measure engine RPM from sound without any tools. Simply point your phone at the exhaust of various engines like motorcycles, cars, or lawn mowers to get accurate, real-time readings. The app automatically filters background noise and indicates signal quality for reliable measurements.

Giri -The RPM Checker-

by Natural Style Co. Ltd.

Free

This tool measures the rotational speed of motors, ideal for hobbyists working with drivable model cars. It features noise removal, speed conversion, and a memo panel for recording measurements. Customizable skins add a personal touch to the user experience.

MyRPMCalc

Engine RPM From Sound

$1.99

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.