[Abagail]

It is not a certain damage. It really depends. As nathan suggested, make a command that gets your health, and just have someone hit you going at different speeds.

pawn Code:

CMD:myhp(playerid, params[])
{
new Float: HP;
GetPlayerHealth(playerid, HP);
new string[126];
format(string, sizeof(string), "Health: %f", HP);
SendClientMessage(playerid,-1,string);