How long is a centimeter without a ruler?

The length of the little finger nail is about 1 cm.

1, there is no ruler around, just find some references, and RMB is the reference. RMB with face value of 50 is long 150 mm, wide 70 mm, and RMB with face value of 100 is long 155*77 mm, so RMB can still be used.

2. The size of a bank card is generally 85.60× 53.98mm..

3. In the office, a4 paper can also be used instead. Generally speaking, the size of A4 paper is 2 10*297mm.

Extended data for centimeter unit conversion:

1 cm = 10 mm = 10000 micron = 1000000 nanometer =0. 1 decimeter =0.0 1 meter = 0.0000/kloc-0. )

Commonly used units are millimeter (mm), centimeter (cm), decimeter (dm), kilometer (km), meter (m), micron (micron), nanometer (nm) and so on. Length units play an important role in various fields.

Legend of the ruler:

One of Lu Ban's inventions is that he can draw a square ruler correctly and tell craftsmen which sizes are irregular and which ones are unlucky according to the rules of divination (geomantic omen).