Forklift Load Capacity Calculator

The number on a forklift's data plate assumes a standard 24 in load center. A longer load, a wider load, or one that rides further out on the forks has a bigger load center, and that lowers what the truck can safely lift below the plate number. This calculator applies the standard moment method to your plate numbers and your load.

The data plate

The number on the truck's data plate.

Most data plates rate the truck at a 24 in load center.

Half the load's depth, measured from the face of the forks. A standard 48 in pallet, pushed all the way back, is a 24 in load center.

Optional. Enter it to see whether this load is within the limit.

Adjusted safe capacity

5,000 lb

at the rated 24 in load centerThe plate rating still applies.

05,000 lb rated

This is the simplified moment method. Your truck's data plate and the manufacturer's rating govern. Mast height, tilt, uneven floors, and speed all reduce capacity further.

The course covers load center, the stability triangle, and why a raised load tips a truck, in about an hour for $59.

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How to use the calculator

  1. 1

    Enter the rated capacity and rated load center from your truck's data plate.

  2. 2

    Enter the actual load center of what you're moving, and an attachment if you're using one.

  3. 3

    See the adjusted safe capacity on the right, and whether your load weight fits inside it.

How the math works

This calculator uses the simplified moment method, the same approach taught in forklift operator training. Capacity times load center is a moment, in inch-pounds, and the truck's counterweight can only offset so much moment before the front wheels become the tipping point. A 5,000 lb truck rated at a 24 in load center is rated to handle 5,000 x 24, or 120,000 in-lb, at that load center.

Move the load center out to 30 in and the truck can still only handle 120,000 in-lb of moment, so the weight it can safely carry drops: 120,000 / 30 works out to 4,000 lb. The further the load center moves out, the less the truck can lift.

Load center Capacity (5,000 lb truck, 24 in rated)
24 in 5,000 lb
28 in 4,280 lb
30 in 4,000 lb
36 in 3,330 lb
48 in 2,500 lb

Going the other direction does not add capacity. A load center closer than the rated 24 in does not raise the truck above its 5,000 lb plate rating. The plate number is a ceiling, not a starting point that gets adjusted upward, and OSHA 29 CFR 1910.178(o)(2) allows only loads within that rated capacity.

What the data plate tells you

Every powered industrial truck carries a data plate with the specifics this calculator needs, and more: rated capacity, rated load center, the maximum fork height that rating is good to, any attachments the truck is marked for, and the truck's own weight.

OSHA 29 CFR 1910.178(a)(6) requires the employer to keep the nameplate and markings in place and legible. Under 1910.178(a)(4), a modification or addition that affects capacity or safe operation needs the manufacturer's prior written approval, and the capacity plate has to be changed to match. Under 1910.178(a)(5), if the truck carries a front-end attachment other than a factory-installed one, the user has to request that the truck be marked to identify the attachment and show the approximate weight of the truck and attachment combination at maximum elevation with the load laterally centered.

A worn or missing plate is not a paperwork problem you can put off. Without it, nobody on the floor has a number to check a load against.

How much does a forklift weigh?

A 5,000 lb capacity sit-down forklift weighs about 7,800 to 9,600 lb, going by Toyota's spec sheets (the electric models, counted with their battery, are the heavy end). Across the manufacturer spec sheets below, sit-down forklifts rated from 3,000 to 17,500 lb weigh from about 5,500 to 22,000 lb, roughly 1.3 to 2.3 times what they are rated to lift. The heavier the rating, the heavier the truck.

OSHA's own example data plate agrees: a propane truck rated for 5,000 lb at a 24 in load center, with a truck weight of 8,680 lb. Your truck's exact weight is on its plate.

Sit-down, propane or gas, cushion tires

Rated capacity: 3,000 to 6,500 lb

Weight: 5,890 to 9,860 lb

Toyota Core IC Cushion spec sheet

Sit-down, propane or gas, air-filled tires

Rated capacity: 3,000 to 6,500 lb

Weight: 5,500 to 9,680 lb

Toyota Core IC Pneumatic spec sheet

Sit-down electric, cushion tires

Rated capacity: 3,000 to 6,500 lb

Weight: 6,770 to 11,130 lb with standard battery (4,930 to 8,130 lb without)

Toyota Core Electric spec sheet

Sit-down, propane, air-filled tires (mid-size)

Rated capacity: 8,000 to 11,000 lb

Weight: 12,860 to 16,010 lb

Toyota Mid IC Pneumatic spec sheet

Sit-down, propane, air-filled tires (large)

Rated capacity: 13,500 to 17,500 lb

Weight: 18,720 to 22,040 lb

Toyota Large IC Pneumatic spec sheet

Stand-up reach truck

Rated capacity: 3,500 to 4,500 lb

Weight: 5,147 to 7,846 lb without battery; minimum battery weight 1,600 to 2,600 lb

Crown RR 5700 spec sheet

Walkie electric pallet jack

Rated capacity: 4,500 lb

Weight: 690 to 715 lb without battery

Crown WP 3200 spec sheet

Weights are the makers' listed truck weights for their standard models, opened September 2026. Masts, attachments and tires change them. For the Toyota electric trucks, the with-battery figure adds up the sheet's axle weights with the standard battery.

Why a forklift weighs more than it lifts: the counterweight

A sit-down forklift works like a see-saw. The front wheels are the pivot, the load sits out in front of them, and the truck's own weight sits behind them. OSHA's stability appendix defines the counterweight as the weight "built into the truck's basic structure" that is "used to offset the load's weight and to maximize the vehicle's resistance to tipping over." As long as the truck's moment behind the front wheels is at least as big as the load's moment in front, the truck stays down.

Toyota's spec sheet for its 5,000 lb cushion-tire truck shows the shift. Empty, the 8,000 lb truck puts 5,180 lb on its rear wheels and 2,820 lb on its front wheels. With a full 5,000 lb load at the rated load center, the front wheels carry 11,310 lb and only 1,690 lb is left on the rear.

That small rear number is the margin. Go over the rating, or push the load center further out, and the rear wheels keep getting lighter. OSHA's appendix describes what comes next: the truck "will begin to tip forward, thereby causing the rear to lose contact with the floor or ground and resulting in loss of steering control." This calculator finds the weight that keeps you inside that margin.

On electric trucks the battery is part of the weight. Toyota notes that on its standard sit-down data plate, an electric truck's weight leaves the battery out, and the plate also lists a minimum and maximum battery weight. Keep any replacement battery inside that range. On any truck, OSHA forbids adding counterweight without the maker's approval: "Additional counterweighting of fork trucks shall not be done unless approved by the truck manufacturer" (1910.178(q)(6)).

Why the truck's weight matters on the job

Dock plates, trailer floors, mezzanines and elevators have to carry the truck and the load together. Toyota's 5,000 lb cushion-tire truck with a full load weighs 13,000 lb in total, and that is what a dock plate has to carry, not 5,000. OSHA requires that dockboards and bridge plates never be loaded past their rated capacity (1910.178(n)(11)), and that trailer and railcar floors be checked for breaks and weakness before a truck drives on (1910.178(m)(7)).

Why attachments cut capacity

An attachment does two things to the math, both of which work against you. It adds its own weight, which the truck's counterweight now has to help offset, and it usually sits between the fork face and the load, which pushes the load center further out than it would be on bare forks. A side-shifter or a clamp typically lowers the rating for that reason, and under 1910.178(a)(4) the capacity plate has to be changed to match, with the manufacturer's prior written approval.

Run the numbers on a 5,000 lb truck rated at a 24 in load center, fitted with a 150 lb side-shifter that adds 4 in of thickness. A standard pallet at a 24 in load center now sits at an effective 28 in load center, which alone drops the base rating to about 4,280 lb. Take off the attachment's 150 lb, and the truck is down to roughly 4,130 lb, a 17% cut from the 5,000 lb plate number, before the load itself is even on the forks.

What this tool can't see

Mast height

Raising the load also raises its center of gravity, which makes the truck less stable at the same weight and load center. A truck rated for 4,000 lb with the forks near the ground can tip sooner carrying that same 4,000 lb raised 15 feet in a high-bay rack.

Forward tilt

Tilting the mast forward to pick up or set down a load shifts the load's weight further toward the front wheels, the truck's actual tipping point. On our stability diagram, a 5,000 lb load at 200 in of lift crosses the front axle line at just 4 degrees of forward tilt.

Uneven floors

A dip, a pothole, or a floor joint tilts the whole truck for a moment, moving the load's effective position without the operator changing anything. A forklift crossing a dock plate gap with a raised load can tip from that jolt alone.

Ramps

Driving up or down a grade shifts the load toward the downhill end of the truck. A forklift going down a loading ramp with a full load and the forks raised even a few inches is at far more risk than the same truck on flat ground.

Turning speed

A sharp or fast turn adds sideways force that the stability triangle has to absorb along with the load's weight. On our stability diagram, a 5,000 lb load at 200 in of lift tips sideways in a hard turn with the mast dead level.

A load that shifts

An unstable stack, a loose pallet, or cargo that was never centered can move once the truck starts moving, changing the real load center after the fact. A drum load that rolls to one side of the pallet mid-drive throws off every number this calculator assumed going in.

See how those move the center of gravity on our stability triangle explainer.

Frequently asked questions

How do you calculate forklift load capacity?
Multiply the rated capacity by the rated load center, then divide by the actual load center of the load you are moving. A 5,000 lb truck rated at a 24 in load center, carrying a load with a 30 in load center, works out to 5,000 x 24 / 30, or 4,000 lb. A load center shorter than the rated 24 in does not raise the limit above the plate number.
What is a forklift load center?
The load center is the horizontal distance from the face of the forks to the load's center of gravity. Most trucks are rated at a 24 in load center, which matches half the depth of a standard 48 in pallet pushed all the way back against the fork carriage. A longer, wider, or off-center load has a load center further out, which lowers what the truck can safely carry.
Does an attachment reduce forklift capacity?
Yes, in two ways. The attachment itself weighs something and comes off the top of the rating, and most attachments push the load further from the fork face, which increases the effective load center. A 150 lb side-shifter that adds 4 in of thickness on a 5,000 lb / 24 in truck drops the usable capacity to around 4,130 lb for a standard pallet.
Can a forklift lift more than its rated capacity if the load is close to the mast?
No. The rated capacity on the plate is a maximum, measured at the rated load center. Pulling a load closer to the mast than that does not raise the ceiling, it just puts you further inside it. OSHA 29 CFR 1910.178(o)(2) allows only loads within the truck's rated capacity.
What is the difference between rated capacity and net capacity?
Rated capacity is the number stamped on the data plate, measured at the manufacturer's standard load center with no attachments. Net capacity, sometimes called actual or adjusted capacity, is what the truck can safely carry once you account for your load's real load center and any attachment, and it is usually lower than the plate number.
How much does a 5,000 lb forklift weigh?
About 7,800 to 9,600 lb. Toyota's 5,000 lb propane and gas models weigh 7,840 to 8,160 lb, and its 5,000 lb electric models come to 9,310 to 9,570 lb with the standard battery. Your truck's exact weight is printed on its data plate.

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