Speed Converter

Instant Speed Unit Conversion

Stop guessing your velocity. This Speed Converter delivers instant, high-precision translations between MPH, KM/H, Knots, and m/s. Whether you are a pilot calculating true airspeed, a driver adjusting for international speed limits, or a student solving physics problems, accuracy matters. Manual formulas invite error; our tool automates the math, ensuring 10-decimal precision for driving, aviation, and maritime navigation.

How to Use This Tool

1. Input Velocity: Enter the numeric speed value in the "From" field.
2. Choose Units: Select your current unit (e.g., MPH) and your target unit (e.g., Knots).
3. Get Result: Click "Convert Speed." The tool instantly calculates the equivalent velocity.

Frequently Asked Questions

How do you convert RPM to speed (mph or km/h)?

You cannot directly convert RPM (Rotations Per Minute) to linear speed without wheel size and gear ratio data. RPM measures engine or wheel spin, while MPH measures distance traveled. To calculate it, you must use the formula: Speed = RPM × Tire Circumference × 60.

What is 4000 RPM in mph?

This depends entirely on the vehicle's gearing and tire diameter. In a standard car in top gear, 4000 RPM might equal 80-100 MPH. In a lower gear, it might only be 40 MPH. There is no fixed conversion constant between RPM and MPH.

How fast is 70 RPM in mph?

Context is required. On a standard 26-inch bicycle wheel, 70 RPM equals roughly 5.5 MPH. On a large tractor tire, 70 RPM results in a significantly higher speed due to the increased distance covered per rotation.

How do you convert km to mph?

To convert Kilometers per Hour to Miles per Hour, multiply the KM/H value by 0.621371. The formula is: MPH = KM/H × 0.621371.

How fast is 100 km in mph?

100 KM/H is equal to approximately 62.14 MPH. This is a common highway speed limit in many countries using the metric system.