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1 drop of water (gtt Metric) = 0.050 milliliters (ml) Advertisements. * Whole number, decimal or fraction ie: 6, 5.33, 17 3/8. * Precision is how many digits after decimal point 1 - 9.
I have tested a few different droppers and transfer pipettes (putting a fixed number of drops into a small grad. cylinder and using the raw value to find a per ml equiv.) and it seems like the general range is 20-30 drops per ml, so I see why 20 drops is a reasonable estimate - for some reason e-liquid-recipes defaults to 35, and I don't think I have ever seen a dropper that is that precise - only pipettes.