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Convert inches to mm
Interactive inches to millimeters conversion tool
The inches to mm converter below can be used to quickly and easily convert inches to millimeters. Simply enter the number of inches you want to convert and the calculator will output the corresponding value in millimeters.
What is the conversion factor between inches and millimeters?
A conversion factor is used to change the units of a measured quantity without changing its value. It represents the ratio (or fraction) that expresses the relationship between two different units. A conversion factor is always equal to 1.
The relationship between inches and millimeters is 25.4, such as:
Following the formula above, we can see that there are 25.4 millimeters for every inch, and for every millimeter, there are 125.4 inches (0.0393701 in).
To convert from inches to millimeters, we turn our formula into a conversion factor that is equal to 1.
Both these fractions are equal to 1. The numerator and the denominator are equivalent, they are just expressed in different units.
Because we are converting from inch to millimeter, we will use the first fraction: 25.4 mm1 in so that inches are canceled out. We then multiply the value in inches by this fraction to get the result in millimeters (see example).
Note that in is in the denominator (bottom) of the conversion factor. This is important, you always want to have the unit you are converting from at the bottom and the unit you are converting to in the numerator (top).
You will find below how to use this ratio to convert from in to mm. Just remember for now that the conversion factor for converting from inches to millimeters is:
Which is bigger, an inch or a millimeter?
When it comes to measurements, there can be some confusion over which is bigger, a inch or an millimeter. To find out which one is larger, we must first convert one unit to the other and then compare them.
- 1 in = 25.4 mm
- 25.4 millimeters is bigger than 1 millimeter.
- 1 inch is, therefore, bigger than 1 millimeter.
- To be more specific, a millimeter is 25.4 times smaller than an inch.
inches to millimeters conversion table
| inches | millimeters | inches | millimeters |
|---|---|---|---|
| 1 in | 25.4 mm | 11 in | 279.4 mm |
| 2 in | 50.8 mm | 12 in | 304.8 mm |
| 3 in | 76.2 mm | 13 in | 330.2 mm |
| 4 in | 101.6 mm | 14 in | 355.6 mm |
| 5 in | 127 mm | 15 in | 381 mm |
| 6 in | 152.4 mm | 16 in | 406.4 mm |
| 7 in | 177.8 mm | 17 in | 431.8 mm |
| 8 in | 203.2 mm | 18 in | 457.2 mm |
| 9 in | 228.6 mm | 19 in | 482.6 mm |
| 10 in | 254 mm | 20 in | 508 mm |
How to convert inches to millimeters?
Multiplying any value by 1 will get you the same value back. You can do that one time or multiple times.
For example:
- 5 x 1 = 5
- 846 x 1 x 1 x 1 = 846
Multiplying by 1 is the first step in any unit conversion problem. The second step is to replace the number 1 with the conversion factor that is also equal to 1.
For example, if we want to convert 10 inches into millimeters we multiply 10 in by the conversion factor of 25.4 mm1 in
By replacing the number 1 with the conversion factor, inches are canceled out and we get the result in millimeters. And since the conversion factor is equal to 1, multiplying it with the original value won't change its magnitude and will only change its unit.
Based on this, we can conclude that 10 inches are equal to 254 millimeters.
Remember:
- When converting from inches to millimeters, we use 25.4 mm1 in as a conversion factor.
Practice: inches to millimeters conversion
Try answering the following questions without using our custom conversion calculator. Knowing how to convert manually between inches and millimeters could prove to be useful, so give it a shot. Once you are confident you can convert inches to millimeters, there is no harm then in taking full advantage of the tools available to you.
How to convert 75 inches to millimeters?
We multiply 75 by the factor of 1
We replace the number 1 with the conversion factor for inches to millimeters
We multiply 75 inches by the conversion factor. Having inches in the denominator allows us to cancel out the undesired units (in) leaving only millimeters in the final result.
Answer: There are 1905 millimeters in 75 inches
How many millimeters are in 630 inches?
Multiply 630 by the conversion factor. Make sure the unwanted unit (in) is in the denominator.
This allows us to cancel out the inches (in) and leave the millimeters (mm)
Answer: There are 16002 millimeters in 630 inches
millimeters to inches conversion
- 1 mm = 125.4 in = 0.03937007874 in
- To convert from millimeters to inches use our mm to inches converter
inches conversion
Convert from Inches (in):
- Inches to kilometers (in to km)
1 in = 2.54e-5 km - Inches to meters (in to m)
1 in = 0.0254 m - Inches to centimeters (in to cm)
1 in = 2.54 cm - Inches to millimeters (in to mm)
1 in = 25.4 mm - Inches to micrometers (in to μm)
1 in = 25400 μm - Inches to nanometers (in to nm)
1 in = 2.54e+7 nm - Inches to nautical miles (in to nmi)
1 in = 0.02541852 nmi = 1.371490281e-5 nmi - Inches to miles (in to mi)
1 in = 163360 mi = 1.578282828e-5 mi - Inches to yards (in to yd)
1 in = 136 yd = 0.02777777778 yd - Inches to feet (in to ft)
1 in = 112 ft = 0.08333333333 ft
Convert to Inches (in):
- Kilometers to inches (km to in)
1 km = 12.54e-5 in = 39370.07874 in - Meters to inches (m to in)
1 m = 10.0254 in = 39.37007874 in - Centimeters to inches (cm to in)
1 cm = 12.54 in = 0.3937007874 in - Millimeters to inches (mm to in)
1 mm = 125.4 in = 0.03937007874 in - Micrometers to inches (μm to in)
1 μm = 125400 in = 3.937007874e-5 in - Nanometers to inches (nm to in)
1 nm = 12.54e+7 in = 3.937007874e-8 in - Nautical miles to inches (nmi to in)
1 nmi = 18520.0254 in = 72913.38583 in - Miles to inches (mi to in)
1 mi = 63360 in - Yards to inches (yd to in)
1 yd = 36 in - Feet to inches (ft to in)
1 ft = 12 in
millimeters conversion
Convert from Millimeters (mm):
- Millimeters to kilometers (mm to km)
1 mm = 11e+6 km = 1e-6 km - Millimeters to meters (mm to m)
1 mm = 11000 m = 0.001 m - Millimeters to centimeters (mm to cm)
1 mm = 110 cm = 0.1 cm - Millimeters to micrometers (mm to μm)
1 mm = 1000 μm - Millimeters to nanometers (mm to nm)
1 mm = 1e+6 nm - Millimeters to nautical miles (mm to nmi)
1 mm = 11.852e+6 nmi = 5.399568035e-7 nmi - Millimeters to miles (mm to mi)
1 mm = 11.609344e+6 mi = 6.213711922e-7 mi - Millimeters to yards (mm to yd)
1 mm = 1914.4 yd = 0.001093613298 yd - Millimeters to feet (mm to ft)
1 mm = 1304.8 ft = 0.003280839895 ft - Millimeters to inches (mm to in)
1 mm = 125.4 in = 0.03937007874 in
Convert to Millimeters (mm):
- Kilometers to millimeters (km to mm)
1 km = 1e+6 mm - Meters to millimeters (m to mm)
1 m = 1000 mm - Centimeters to millimeters (cm to mm)
1 cm = 10 mm - Micrometers to millimeters (μm to mm)
1 μm = 11000 mm = 0.001 mm - Nanometers to millimeters (nm to mm)
1 nm = 11e+6 mm = 1e-6 mm - Nautical miles to millimeters (nmi to mm)
1 nmi = 1.852e+6 mm - Miles to millimeters (mi to mm)
1 mi = 1.609344e+6 mm - Yards to millimeters (yd to mm)
1 yd = 914.4 mm - Feet to millimeters (ft to mm)
1 ft = 304.8 mm - Inches to millimeters (in to mm)
1 in = 25.4 mm