Originally Posted by The BookYou can make a running long jump of (Str modifier + 10) feet, a
standing long jump of half that distance, and a high (vertical) jump of a
quarter that distance. Round all distances down to the nearest foot. So
a Strength 10 (+0 modifier) character can make a running long jump of
10 feet, a standing long jump of 5 feet and a high jump of 2 feet (2.5,
rounded down to 2). Increases to your Strength, including extra effort
(see page 120), increase your jumping distances as well. Super-Strength
(see page 104) does not increase jumping distances. Extra effort doubles
your jumping distance for one jump. The Leaping power (see page
90) greatly increases the distance you can jump.
If you make a long jump and fail to clear the distance by your height
or less, you can make a Reflex save (DC 15) to grab the far edge of a gap.