It's really easy to learn the size of your body. My span is around than 20 cm. 5 of them is 1 meter. the width of my pinky is 1 cm. You can learn how to step 1m distance, for me it's a bit longer than a normal step. I can measure with my body between 1cm and several meters. So it's really easy to overcome this small limitation of the metric system.

[–] programmer_belch@lemmy.dbzer0.com 8 points 1 year ago

It's as easy as getting comfortable with the usual measures of your body. I also know how much is a kilogram because I can lift a big water bottle which also is a liter. Really, the way all of the units are built more or less around water can give you a pretty accurate instinct.