You can use this simple chart to convert Metres to Feet 

Metres	Feet
1	3.28
2	6.56
3	9.84
4	13.12
5	16.40
6	19.69
7	22.97
8	26.25
9	29.53
10	32.81
15	49.21
20	65.62
25	82.02
30	98.43
35	114.83
40	131.23
45	147.64
50	164.04
100	328.08

And here's a chart to convert Feet to Metres

Feet	Metres
1	0.3
2	0.6
3	0.9
4	1.2
5	1.5
6	1.8
7	2.1
8	2.4
9	2.7
10	3.0
15	4.6
20	6.1
25	7.6
30	9.1
35	10.7
40	12.2
45	13.7
50	15.2
100	30.5