The statcoulomb ($statC$) or franklin ($Fr$) or electrostatic unit of charge ($esu$) is the physical unit for electrical charge used in the centimetre-gram-second system of units (cgs) and Gaussian units. It is a derived unit given by $1\ statC = 1\ g\ cm\ s = 1\ erg\ cm$. The SI system of units uses the coulomb (C) instead. The conversion between C and statC is different in different contexts. The number 2997924580 is 10 times the value of the speed of light expressed in meters/second, and the conversions are exact except where indicated. The coulomb is an extremely large charge rarely encountered in electrostatics, while the statcoulomb is closer to everyday charges.
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0.00000000033356409519815204957557671447492
$1 C \leftrightarrow 2997924580 statC \approx 3.00 \times 10^9 statC,\ 1 \hspace{0.3pc} statC \leftrightarrow \hspace{0.3pc} \approx 3.34 \times 10^{-10} C$ for electric charge.
$1 C \leftrightarrow 4 \pi \times 2997924580 statC \approx 3.77 \times 10^{10} statC,\ 1 \hspace{0.3pc} statC \leftrightarrow \hspace{0.2pc} \approx 2.6 \times 10^{-11} C$ for electric flux $\Phi_D$
$1 C/m \leftrightarrow 4 \pi \times 2997924580 \times 10^{-4} statC/cm \approx 3.77 \times 10^6 statC/cm,\ 1 \hspace{0.3pc} statC/cm \leftrightarrow \hspace{0.3pc} \approx 2.65 \times 10^{-7} C/m$ for electric displacement field $D$.
3.3356409519815204957557671447492E-10