Kilometers per hour to meters per second converter

Read a quantity in km/h, then express the same speed in m/s. The units are defined below to avoid mixing similarly named standards.

Direct example

1 km/h ≈ 0.277777777778 m/s.

Formula and calculation

m/s = km/h × 0.277777777778

Substituting 1 km/h gives approximately 0.277777777778 m/s. Definitions use the constants above; arithmetic uses browser floating point and displays at most 12 significant digits. The rounded table is not an instrument calibration or certified measurement.

Which units does this page use?

kilometers per hour: speed of one kilometre travelled per hour.

meters per second: SI unit of speed; not meters per square second.

When this direction is useful

Start here when your source record uses km/h for speed limits and vehicle speed displays, but the receiving specification is expressed in m/s for physics calculations and wind-speed measurements. Enter the original quantity rather than reusing a previously rounded result. If your source uses m/s, use the reverse converter instead.

Conversion table

Approximate displayed values, with the same definitions as the converter
kilometers per hour (km/h)	meters per second (m/s)
0	0
1	0.277777777778
5	1.38888888889
10	2.77777777778
100	27.7777777778

Limits and interpretation

These are non-negative physical quantities; negative inputs are rejected. Converting a unit changes neither the measured object nor the original precision. Use a decimal dot; grouping commas are not accepted. No external rates, live data or account are involved.

Frequently asked questions

Can I convert the other way?

Yes. Convert meters per second to kilometers per hour with the inverse equation. Rounding a result before converting it back can introduce a small difference.

Are these the same as every similarly named unit?

No. Check the two definitions above. International length, avoirdupois mass, US customary liquid measures and temperature readings are explicitly distinguished; an ambiguous label on a source document must be resolved first.

Where do the conversion definitions come from?

They use SI and defined customary conversion relationships. See the NIST Guide for the Use of SI. Output formatting is this tool's display policy, not extra measurement accuracy.