Femtometre
Unit of length
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The femtometre symbol fm is a unit of length in the International System of Units equal to 10⁻¹⁵ metres, which means a quadrillionth of one metre. Wikipedia
1 fm in: is equal to
imperial/US units: 3.9370×10−14 in
Natural units: 6.1877×1019 ℓP; 1.8897×10−5 a0
SI base units: 1×10−15 m
Symbol: fm
Unit of: length
Unit system: SI