Speed Converter (km/h, m/s, mph, knots)
Convert km/h, m/s, mph, knots, ft/s and approximate Mach number.
Result
How to use
- 1
Type the speed you want to convert.
- 2
Pick the From and To units — or press Swap to flip them.
- 3
See the answer, the formula, every other unit and a ready table of common values.
Questions
How do I convert km/h to m/s?
Divide by 3.6 (because 1 km/h = 1,000 m ÷ 3,600 s). So 72 km/h = 20 m/s. Multiply m/s by 3.6 to get km/h.
What is a knot?
One knot is one nautical mile per hour = 1.852 km/h exactly. Ships and aircraft use knots.
How accurate is the Mach number?
Mach 1 is the speed of sound, which depends on air temperature. This tool uses 343 m/s (about 1,235 km/h, dry air at 20 °C at sea level), so treat Mach values as approximate.
About this Speed tool
Speed Converter (km/h, m/s, mph, knots) — Convert km/h, m/s, mph, knots, ft/s and approximate Mach number. It is one of 200 free tools on namasivayam.in, made by software engineer Namasivayam Vadivelan for everyday use in India.
Everything is calculated instantly in your browser: nothing you type or upload is sent to any server, there is no sign-up, and it works on mobile and desktop. Type the speed you want to convert.
Related reading
Articles that go with this tool
El Niño Explained: Why a Warm Pacific Ocean Changed India’s Monsoon in 2026
2026’s monsoon ended about 13% below normal — the weakest since 2015 — as a strong El Niño built up in the Pacific. What El Niño is, how it affects India, and what to expect in the coming months.
Rooftop Solar for Indian Homes: A Simple Guide to PM Surya Ghar Muft Bijli Yojana
Can solar panels on your roof cut your electricity bill to near zero? How rooftop solar works, the PM Surya Ghar subsidy of up to ₹78,000, and what to check before you install.
ISRO’s Journey: From Chandrayaan-3’s Moon Landing to Aditya-L1 and Gaganyaan
On National Space Day, a look back at how India landed near the Moon’s south pole, sent an observatory to watch the Sun, and is preparing to fly its own astronauts with Gaganyaan.
Related tools
More converters tools you may like
Results are estimates to help you plan. They are not financial, tax or medical advice.