Here are statements that I believe to be true in Natural Units (hbar = c = 1). Hope I'm right…
1 = 6.58 x 10-25 sec GeV
1 = 1.97 x 10-16 meter GeV
1 = 1.97 x 10-14 centimeter GeV
sec = 3.00 x 108 meter
sec = 3.00 x 1010 centimeter
1 = 1.60 x 10-19 Coulomb
Tesla = 3.72 x 10-16 GeV2
1 = 0.389 millibarn GeV2