Speed Converter
Convert km/h, mph, m/s and knots.
Your inputs
Your inputs and files stay on your device.
Your result
A little input. A useful answer.
Enter your values and run the tool to see your result here.
How to use this tool
- Enter a value.
- Choose units.
- Copy result.
About Speed Converter
Convert km/h, mph, m/s and knots.
Does this tool send my data anywhere?
No. Its calculation or transformation happens on your device.
Using Speed Converter with the right inputs
Convert km/h, mph, m/s and knots. Start by matching your task to the quantities and options shown below. The definitions of the inputs matter as much as the final number or transformed output; retain the original values so that you can repeat or check the result.
Inputs and options explained
- Value: Enter the numeric value for this quantity using the units or scale shown in the label.
- From: choose Metres per second (m/s), Kilometres per hour (km/h), Miles per hour (mph), Knots.
- To: choose Metres per second (m/s), Kilometres per hour (km/h), Miles per hour (mph), Knots.
- Decimal precision: choose 2 decimal places, 4 decimal places, 6 decimal places, 8 decimal places, 10 decimal places.
Example to try in this tool
Use the following sample values to see how the controls and result fit together. They are an illustration of the operation, not recommended values for your own situation.
- Value: 1
- From: Metres per second (m/s)
- To: Kilometres per hour (km/h)
- Decimal precision: 2 decimal places
Select Convert. The result begins with:
Kilometres per hour (km/h)
3.6
1 Metres per second (m/s)
Metres per second (m/s)
1
This example records the tool’s output for those inputs. Check the method and assumptions against your own task before using a result; reproducing an example is not independent certification of the underlying model.
Interpretation and limitations
Identify the physical quantity, measurement units and assumed conditions before calculating. A mathematical relationship is useful only within the model it describes. Real measurements include uncertainty, and additional effects may matter outside the simplified situation represented by the inputs.
Do more decimal places mean a more accurate measurement?
No. Display precision does not improve the original measurement or the model. Report a result with precision appropriate to the data and state the assumptions used.
Before you use the output
- Choose the intended action: ⇄ Swap units, Convert. Re-run the operation after changing an input or mode so that you are checking the updated result.
- Read the result label and any accompanying explanation. Keep the input values or source file with the output so that a later comparison uses the same assumptions.
- If a result looks unexpected, check units, separators and selected options first. Try a smaller example you can verify rather than repeatedly changing several settings at once.
Questions or a result that needs checking?
If you find a discrepancy, report a problem with Speed Converter. Include a non-sensitive example, the selected options, the result you expected and the result shown. This makes the issue easier to reproduce. See About & privacy for how the site handles tool inputs.