Inches to mm Convertor
This handy calculator takes the guess work or hard calculations out converting imperial dimensions into metric dimension (or vice versa!), for your roofing or building project.
With different building products often being sold in different dimensions the RapidKey Convertor simplifies it. Common calculations are including converting inches to mm when ordering cut to size polycarbonate roofing sheets or matching a profile on Corrugated Roofing Sheets.
The RapidKey Imperial to metric calculator works both ways so it doesn't matter whether you are converting from inches to mm or mm to inches, just out your dimension in the relevant side of the calculator!
If you want to find out more about converting metric to imperial dimensions, inches to mm for example, then read below. To skip to a section just click the links below!
What are imperial measurements/ dimensions?
What are metric measurements/ dimensions?
How to convert inches to millimetres?
Why are Roofing Sheets best measured in millimetres?
What are Imperial measurements/ dimensions?
Imperial measurements are a system of units that was first defined in Britain back in 1824! Common imperial units of measure include:
- Inches (in)
- Feet/Foot (ft)
- Yard (yd)
- Mile (mi)
What are Metric measurements/ dimensions?
Metric Measurement is a more popular system of units originating in the 1790's that is now used by the majority of countries as their primary measurement system. Common metric units of measure include:
- Millimetre (mm)
- Centimetre (cm)
- Metre (m)
- Kilometre (km)
How to convert inches to millimetres?
Converting inches to millimetres (mm) is very easy, simply multiply your inches dimension by 304.8 and the result will be your same dimension in centimetres!
Here are three easy steps to convert inches to mm:
- Note your inches dimension down
- Multiply it by 304.8
- if you wish, round the result to 0 decimal places by removing any figures after the decimal place. E.g. 7010.40 equals 7010mm
Inch Conversion Table
To convert inches into units, metric or imperial, you simply have to multiply your inches dimension by the right factor.
In essence, this means that whether you are converting inches to metres, inches to millimetres or inches to centimetres the method is exactly the same; only the number you multiply by changes.
Below is a Inches Conversion Table that shows what number you should multiply by when converting from Inches to different units:
| Conversion Unit | Inch (in) Multiplication Number |
| Millimetres (mm) | 25.4 |
| Centimetres (cm) | 2.54 |
| Metres (m) | 0.0254 |
| Kilometre (km) | 0.0000254 |
| Feet (ft) | 0.0833333 |
| Yard (yd) | 0.0277778 |
| Mile (mi) | 0.000015783 |
For example, if you were converting 35 inches to mm the calculation would be:
35 (inches) x 25.4 = 889mm
Feet (ft) Conversion Table
Below is a Feet/Foot Conversion Table that shows what factor number you should multiply by when converting from Feet to different units:
| Conversion Unit | Feet (ft) Multiplication Number |
| Millimetres (mm) | 304.8 |
| Centimetres (cm) | 30.48 |
| Metres (m) | 0.3048 |
| Kilometre (km) | 0.0003048 |
| Inches (in) | 12 |
| Yard (yd) | 0.33333 |
| Mile (mi) | 0.0001894 |
Yards Conversion Table
Below is a Yard Conversion Table that shows what factor number you should multiply by when converting from Yardto different units:
| Conversion Unit | Feet (ft) Multiplication Number |
| Millimetres (mm) | 914.4 |
| Centimetres (cm) | 91.44 |
| Metres (m) | 0.9144 |
| Kilometre (km) | 0.0009144 |
| Inches (in) | 36 |
| Feet (ft) | 3 |
| Mile (mi) | 0.000568182 |
Why are Roofing Sheets best measured in millimetres?
Roofing Sheets are measured in millimetres, rather than inches, because it gives the most precise measurement, being a small unit of measurement. Measuring sheets, whether Corrugated Roofing Sheets or Polycarbonate Roofing Sheets, in millimetres is advised to ensure your roof is accurate and square.
Nowadays, the majority of Roofing sheets are measured in millimetres, however, this wasn't always the case!
If you are wanting a bespoke size, our manufacturing teams can cut to your roofing sheet size for you with both our Multiwall and Twinwall Polycarbonate Sheets and Solid Glazing Sheets.
Would you like further help with sizes for your Roofing Project?
Simply jump on our Live Chat or via email shop@clearamber.com where our Teams will provide you with all the advice and support you require for your project.
Place Your Order Today – Get Same Day Despatch, Free Returns & Flexible Payment!
At Clear Amber Shop you can have total peace of mind with:
- Get SWIFT Guaranteed Same Day Despatch for rapid delivery
- Return items within the scope of our NQS Returns Policy
- Get Instant Credit choosing our Flexible Payment Options
- Register your products for Total Lifespan® Warranty
Our Teams are here to support help you with every step of your project!
