The best way to measure your garden would be to first draw an accurate plan on squared graph paper. Simply measure the widest and longest lengths of the area you are looking to lay your artificial turf. Take into account any extra areas you may need to cover if your garden is not a simple square or rectangular shape.
If you've worked out these measurements accurately, simply multiply the width by the length and you will know how many m2 of artificial grass you will need to cover your area.
Check out our Installation guide.
This will give you a step by step guide on how to fit your artificial grass yourself.