1 GGy (Gigagray) is equal to 999,999,999.9999999 J/kg (Joule per Kilogram). To convert from Gigagray to Joule per Kilogram, multiply by 999,999,999.9999999 or divide by 0.000000001.
Nine Hundred Ninety-Nine Million Nine Hundred Ninety-Nine Thousand Nine Hundred Ninety-Nine Point Nine Nine Nine Nine Nine Nine Nine Joule per Kilogram