Running long jump (with a run of 10 feet) distance is your Strength score in feet, half if there is no running. Gear weight and height doesn't matter. Someone with 20 of Strength will cover 20 feet (that's 6.096 meters) on a running long jump. The male world record is 8.95 meters (1991) and that's was done with 131 feets of railway to sprint on and basically naked. Some classes have feature that increase jump distance as well.
In the BG3 gameplay we have seen, movement was consumed by jumping as per the rule, but the distance was a few feet longer than it should be for the characters. Swen said that was because of the tadpole.
