How many meters are there in 6'1'?

The first thing to do is make sure you're working in consistent units. There are 12 inches in a foot, so 6'1" is equal to 6x12 + 1 or 73 inches. There are 0.0254 metres in an inch, so to convert from inches to metres you need to multiply by 0.0254. Doing this gives:

73 x 0.0254 = 1.8542

And so there are 1.85m in 6'1"