Speed Converter
Convert mph, km/h, m/s, knots, and pace.
This speed converter converts between mph, km/h, meters per second, knots, and a feet per second calculator unit, using fixed conversion factors. It's useful for anything from vehicle speeds to wind and boating speeds measured in knots.
Select your source and target speed units, enter a value, and the converter returns the result instantly.
Worked Calculation Examples
| Scenario | Result | Calculation Step |
|---|---|---|
| 65 mph to km/h | ≈104.6 km/h | 65 × 1.60934 ≈ 104.6 km/h. |
| 20 knots to mph | 23 mph | 20 × 1.15 = 23 mph. |
How to Calculate Speed Conversions
Speed conversions multiply the source value by a fixed factor - 1 mph equals approximately 1.60934 km/h, and 1 mph equals about 1.467 feet per second. Knots (nautical miles per hour) are used in aviation and boating and equal about 1.15 mph.
Speed vs. Pace: Two Ways to Express the Same Thing
Speed measures distance per unit time (miles per hour), while pace measures time per unit distance (minutes per mile) - the two are mathematically inverse, and this converter can translate between speed units and pace where applicable.
How to Use the Speed Converter
- Open the Speed Converter and enter the values requested in the input fields.
- Check the units, percentages, dates, or time periods before reading the answer.
- Review the instant result and adjust any value to compare another scenario.
- Use the formula, example, and FAQs below to understand how the speed converter works.
Frequently Asked Questions
How to calculate speed conversion from mph to km/h?
Multiply mph by 1.60934 to get the equivalent in km/h.
What is a feet per second calculator conversion from mph?
Multiply mph by approximately 1.467 to get the equivalent speed in feet per second.
How many mph is one knot?
One knot (one nautical mile per hour) equals approximately 1.15 mph.
How do I use this speed converter?
Enter the known values, review the units or settings, and the calculator updates the result instantly. The formula and example on this page show how the answer is produced.
What does the Speed Converter calculate?
Convert mph, km/h, m/s, knots, and pace. It is designed for fast browser-based calculations without sign-up, downloads, or manual spreadsheet setup.
What formula does this speed use?
The formula is: target = source * conversion factor. The nautical knot, still used today in maritime and aviation navigation, gets its name from an actual physical knot - sailors historically measured ship speed by throwing a rope with evenly spaced knots overboard and counting how many passed through their hands in a fixed time, a practical measurement method dating to at least the 16th century that gave the unit its lasting name.
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Last updated: September 27, 2026.