Trigonometry
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The simplest way is to measure it using a metric measure tape. An alternative is to measure your height in inches and multiply the answer by 2.54
Height.
get a tape measure or a ruler and measure it
A protractor is a tool that may be used to measure an angle. The measure of the angle exists irrespective of the tool that is used to measure it. In the same way that you have a height and your height is a [mainly] fixed amount and whether it is measured with a rule or a tape measure or a laser range finder does not affect your height!
You do not convert height to metres, you MEASURE height in metres (or centimetres, or feet or miles).