1500mg CBD in a 30ml bottle = 50mg per ml (5% concentration)Other dosage information:250mg CBD in a 30ml bottle = 8.3mg per ml (0.83% concentration)500mg CBD in a 30ml bottle = 16.6mg per ml (1.66% concentration)1000mg CBD in a 30ml bottle = 33.3mg per ml (3.3% concentration)3000mg CBD in a 30ml bottle = 100mg per ml (10% concentration)1 full dropper contains 1ml of liquid