Free Tool — Forklift / OSHA
Forklift Load Center Calculator
See how a longer load center reduces your truck's safe capacity, and check whether a load is within limits. A core stability concept on the OSHA forklift certification exam.
Forklift Load Center Calculator
Nameplate standard is usually 24 in.
Half the load's length, front to back.
Formula Reference
Rated Moment = Rated Capacity × Rated Load Center
Safe Capacity = Rated Moment ÷ Actual Load Center
(capped at the nameplate rated capacity)
For exam practice and estimation only — not a substitute for engineered design, manufacturer data, current codes, or a licensed professional's judgment. Verify all values before relying on them.
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Why Load Center Changes Capacity
A forklift's rated capacity is given at a standard load center — usually 24 inches, measured from the face of the forks to the load's center of gravity. That rating assumes an evenly distributed load.
When the load center is farther out, the load's leverage (its moment) increases, so the truck's safe capacity drops to keep it stable. The data-plate rating times the rated load center gives the rated moment; divide that moment by the actual load center to get the safe capacity at that distance.
Example: a 5,000 lb truck rated at a 24-inch load center has a 120,000 in-lb moment. At a 36-inch load center, safe capacity falls to 120,000 ÷ 36 = 3,333 lb. Exceeding it risks a forward tip-over — exactly what the exam wants you to prevent.
Frequently Asked Questions
Why does capacity drop as the load center increases?
A load farther from the forks has more leverage (a larger moment) about the front wheels. To keep the truck from tipping forward, the safe capacity must fall as the load center grows.
What is the standard load center?
Most counterbalanced trucks are rated at a 24-inch load center. The exact rated load center is printed on the truck's data plate — always use the value for your specific machine.
How do I find the actual load center?
For a uniform load, it's half the load's length measured front to back. An uneven or top-heavy load shifts the center of gravity and must be handled even more conservatively.
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Practice 5 Forklift / OSHA exam questions
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Forklift / OSHA · Question 1 of 5
The stability of a forklift is based on a geometric shape known as the:
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