Four scales in. Balance out.

Kart corner weight & balance calculator

Enter the four corner weights and KartBalance shows your front/rear, left/right and cross-weight split. Drag ballast onto the chassis and watch the numbers move before you bolt anything on.

For iPhone · Works offline at the track

KartBalance showing corner weights of 67, 73, 90 and 103 on a kart chassis diagram

Front / Rear: 41% / 59%
Left / Right: 49% / 51%
Cross weight: 50%
Base: 333
Total: 363

The kart in the screenshot below, with three 10s placed, worked out.

Scale it in three steps

01
Put the kart on four scales
Corner scales or four bathroom scales on a level floor, driver seated.
02
Enter the corner weights
Front/rear, left/right and cross-weight percentages appear instantly, in any unit.
03
Drag ballast, then bolt it on
Place weights on the chassis diagram and see the new balance before you touch a wrench.

KartBalance with three weights of 10 placed on the chassis diagram

Everything on the scale sheet, none of the arithmetic

Visual chassis diagram Drag-and-drop weight placement.
Real-time corner weights Every change recalculated as you make it.
Center of gravity See where the weight sits on the kart.
Unlimited setups One per track, class or condition.
Any unit Pounds, kilograms, whatever your scales read.
Negative weights Simulate taking ballast off.

Why balance matters

Too much front weight and the kart pushes. Too much rear and it snaps loose. Getting the split right is the cheapest speed in karting, and you can measure it in the pits.

New to scaling? The two-minute tutorial walks through a full setup, and the FAQ covers the rest.