Millimetres

(mm)

Centimetres

(cms)

Inches

(ins)

3m

n/a

1/8th

6.25mm

n/a

1/4

12.5mm

n/a

1/2

25mm

2.5cm

1 ins

50mm

5cm

2 ins

75mm

7.5cm

3 ins

100mm

10cm

4 ins

150mm

15cm

6 ins

200mm

20cm

8 ins

250mm

25cm

10 ins

300mm

30cm

12 ins