Speed Converter
Convert between any two meter/second units in your browser — instant, accurate, and private.
Example
1 m/s = 3.6 km/h. Switch the unit menus to convert between any pair.
How it works
Every value is converted through a single meter/second base unit using internationally defined conversion factors, so any from/to pair stays consistent.
Good to know
Speed conversion shows up constantly in everyday life: reading a foreign car's speedometer in km/h while driving in a mph country, checking a wind forecast quoted in knots, following an athlete's pace in m/s, or understanding why an aircraft cruises at "Mach 0.85." Because each field grew up around its own measurement tradition, the same speed gets labeled six different ways, and this tool lets you move between all of them through a single shared base.
The units split along familiar cultural lines. Meter/second and kilometer/hour are the metric (SI) standard used by science and most of the world's road signs. Mile/hour and foot/second come from the imperial/US customary system still used on roads in the US and UK. Knots (one nautical mile per hour) are the maritime and aviation standard, tied to the curvature of the Earth — one knot is one minute of latitude per hour. Mach is not a fixed speed at all but a ratio to the local speed of sound, which is why it's grouped with the rest only by convention.
A few rules of thumb make mental math easy. To go from m/s to km/h, multiply by 3.6 (and divide by 3.6 to reverse it). For mph to km/h, the quick estimate is "add 60%" — 60 mph is about 96 km/h. Knots to mph is close to "add 15%," since 1 knot is roughly 1.15 mph. Mach 1 at sea level is about 1,225 km/h (761 mph), so Mach 0.85 lands near 1,040 km/h.
The biggest precision caveat is Mach. Unlike the other five units, which convert by exact, fixed factors, the speed of sound drops as air gets colder, so a Mach number near the ground is a noticeably higher true speed than the same Mach number at cruising altitude. Treat any Mach figure here as a sea-level standard reference, not a universal constant. The other common slip is confusing knots with mph or km/h — at boat and aircraft speeds those errors compound fast.
Frequently asked questions
What does the speed converter do?
It converts between common meter per second units instantly. Pick a unit to convert from and a unit to convert to, type a value, and the result updates live.
Which units does this converter support?
It includes 6 units: Meter/second, Kilometer/hour, Mile/hour, Foot/second, Knot, Mach.
Is this converter free and private?
Yes. It runs entirely in your browser, so your inputs never leave your device, there is no sign-up, and it works offline once loaded.
Are the conversions exact?
Conversions use internationally defined factors and are exact where the definitions are exact (for example, 1 inch = 2.54 cm). Displayed results are rounded for readability.
People also ask
How many km/h is 1 m/s?
1 meter per second equals exactly 3.6 kilometers per hour. To convert any m/s value to km/h, just multiply by 3.6; to go back, divide by 3.6.
What is 60 mph in km/h?
60 miles per hour is about 96.6 km/h (60 × 1.609). A handy shortcut is to add roughly 60% to the mph figure to get the km/h value.
How fast is 1 knot in mph and km/h?
1 knot equals about 1.151 mph and 1.852 km/h, because a knot is one nautical mile per hour and a nautical mile is 1,852 meters.
How fast is Mach 1?
Mach 1 is the speed of sound, about 343 m/s, 1,235 km/h, or 767 mph at sea level in standard conditions. It gets slower at higher altitude because cold air lowers the speed of sound.
How do I convert m/s to mph?
Multiply meters per second by about 2.237 to get miles per hour. For example, 10 m/s is roughly 22.37 mph.
How many feet per second is 60 mph?
60 mph equals exactly 88 feet per second, since 1 mph is 1.4667 ft/s. This 60-to-88 relationship is a classic rule used in physics and traffic problems.
Why do ships and planes use knots instead of mph?
Knots tie directly to nautical miles, and one nautical mile equals one minute of latitude, which makes navigation and chart plotting on a curved Earth far simpler. 1 knot is about 1.15 mph.
Is the m/s to km/h conversion exact?
Yes. Because 1 km is exactly 1,000 m and 1 hour is exactly 3,600 seconds, 1 m/s is exactly 3.6 km/h with no rounding involved.
Related calculators