Thank you, that resolves that confusion. I have a rocket fairly similar to the orbit rocket used in the training (I did my best to copy it exactly, but it's based on old notes) and it's around 4,000. While I'm here, do you know the best TWR? I heard it should be at least one, but maybe stop at 2. This would probably change at various altitude levels, but it's something I could fine tune my rocket for now that I know how to change the altitude in the calculator.