There is no single telehandler capacity that applies at every boom height and reach. To determine whether a lift is within limits, use the load chart for the exact machine and approved attachment, then compare the load’s weight with the chart capacity at the planned height and horizontal reach. The chart—not a generic formula or another machine’s rating—is the authority for that configuration.
“Calculate” means reading the right load chart
A telehandler’s capacity changes as the boom moves. Its load chart describes a working envelope: the permitted capacity depends on where the load will be placed and on the machine and attachment configuration. A maximum-capacity figure in a brochure, on a data plate, or for a different boom position does not establish the capacity at your planned position.
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JLG’s guidance explains that each unit has a load-capacity chart for the attachment being used. Caterpillar’s TL943 operation and maintenance manual likewise provides model-specific instructions for reading its chart. Those documents are examples of how manufacturers present the information; neither chart can be used to rate another machine.
In practice, the “calculation” is a comparison: determine the load weight and planned placement point, find the corresponding position on the correct chart, and confirm that the charted capacity is at least as great as the load weight. Do not create your own capacity equation from boom angle, extension, or a headline maximum rating.
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The chart-reading process is deliberately specific. A telehandler does not have one useful capacity number independent of its position, attachment, and load placement. The chart for the machine in front of you provides the applicable limits; a chart from a similar model or a different attachment may have a different operating envelope. If a chart does not clearly cover the intended position, treat that as an unresolved question rather than a reason to estimate.
What you need before reading the chart
- The exact telehandler: Identify the machine model and use its operator manual and load chart. A chart for a similar-looking model is not a substitute.
- The fitted attachment: Confirm that the attachment is approved for the machine and that the chart applies to that attachment. Attachments can affect capacity, lift height, and reach.
- The load weight: Establish the load’s weight from a reliable source. Do not proceed on an estimate if the weight is unknown or uncertain.
- The placement height: Determine how high the load must be placed, using the reference and measurement method specified for the machine.
- The horizontal reach: Determine how far in front of the machine the load must be placed. Chart references differ: JLG describes reach from the front face of the front tire, while the Caterpillar TL943 manual specifies distance from the front tires. Follow the reference printed on your own chart.
These are chart inputs, not interchangeable estimates. A load’s height alone does not identify its chart capacity, and neither does its reach alone.
Before making a chart check, ask the practical planning question JLG highlights: how high and how far will the load need to be retrieved or placed? The answer should describe the intended task, not merely the machine’s maximum lift height or reach. Make sure the stated weight and placement point refer to the load as it will actually be handled. If the weight, attachment, or measurement reference is not known, the chart cannot produce a dependable yes-or-no result.
The manufacturer’s chart and operator manual are the documents to obtain for that purpose. JLG’s January 8, 2019 guidance says, “Every unit is equipped with a load capacity chart for the attachment that is being used.” The point is not simply to find any capacity chart: it is to find the one that matches both the unit and the attachment in use.
How to check a planned lift against the chart
- Match machine and attachment. Check the model identification and fitted attachment, then locate the corresponding chart in the operator documentation. If the chart’s applicability is unclear, stop and get confirmation from the manufacturer or an appropriately qualified equipment representative.
- Establish the load weight. Use a known, reliable weight. Include the load as it will actually be handled; do not compare an incomplete estimate with a chart rating.
- Define the placement point. Identify both the required placement height and horizontal distance. Measure or determine reach using the reference specified by the chart, not an assumed point on the machine.
- Locate the chart position. Find the height and reach corresponding to the planned placement, then read the capacity zone at their intersection. Charts may divide the operating envelope into zones rather than provide a continuous rating for every possible position.
- Apply the chart’s boundary rule. If the position falls on a division between zones, use the lower capacity where the applicable manual directs it. The Caterpillar TL943 manual gives that instruction for its chart; follow the boundary instructions in the manual for your own machine.
- Verify the actual boom position. Use the boom-angle and extension indicators as the machine manual directs. Confirm that the actual position remains within the applicable chart zone; a planned point on paper is not proof that the boom is in that position.
- Compare and decide. The load weight must not exceed the capacity shown for the applicable chart position. If the load is heavier, the point is outside the rated envelope, or any input or interpretation is uncertain, do not make the lift on the basis of a guess.
Read the chart as a match between the planned placement point and a capacity zone, not as a menu of ratings to choose from. First establish the intended height and reach; then use the chart’s axes and labels to locate the corresponding point. Pay attention to the units and measurement references printed on that machine’s chart. If the chart uses a boundary between zones, do not round the planned point into a more favorable zone. For the CAT TL943 chart, the manual specifically says to take the lower capacity when the intersection lies on a zone boundary.
Next, relate the plan to the machine’s actual boom position. The boom-angle and extension indicators help show where the boom is relative to the charted envelope, but they do not alter the chart rating. Use them as directed in the manual and verify the boom is in the position represented by the chart check. If the actual boom position differs from the planned one, the original capacity comparison is no longer enough; check the position against the appropriate chart zone before proceeding.
The decision rule is straightforward: the load weight must be no greater than the capacity for the applicable machine, attachment, and chart position. A point outside the charted envelope, an unreadable zone, or a mismatch between the attachment and chart means there is no established capacity for that planned lift. Stop and resolve the mismatch rather than trying to make the chart fit the job.
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Why height, reach, and attachment change the answer
Boom height and horizontal reach
Height and reach describe different parts of the placement point. A load can be high but relatively close to the machine, or lower and farther out. The chart accounts for the machine’s permitted operating envelope at these positions; it is not safe to assume that a capacity listed for one position holds at another.
Boom angle and extension indicators help an operator relate the actual boom position to the chart. Use them as the manual specifies. They do not replace checking that the planned placement point and load weight fit within the charted zone.
Think of height and reach together. A planned lift cannot be checked by reading only the height scale or only the reach dimension, because the chart relates the two. The intersection identifies the applicable zone. If the height is acceptable at one reach, that alone does not establish an acceptable rating at a farther reach; likewise, a rating at a shorter height cannot automatically be carried over to a higher placement point.
The chart layout and precise ratings vary by model and configuration. There is no general conversion that turns boom angle or extension into a universal capacity figure. Use the indicators to verify the machine’s position against that model’s chart, rather than attempting to calculate capacity from those indicators independently.
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The correct chart is tied to the equipment configuration. An attachment can change capacity as well as the available lift height and reach, so a chart for the forks or another attachment may not describe the machine as currently fitted. Confirm that the attachment is approved and that the chart explicitly applies to it.
Load position matters as well as load weight. JLG’s example specifies a 24-inch load center alongside its stated load, height, and reach. That is a reminder to pay attention to any load-center assumptions shown on the applicable chart or described in the manual. Do not assume an example’s load center, or a chart prepared for one configuration, applies to a different load or attachment.
JLG’s illustrative example shows why chart positions cannot be generalized: it considers a 5,000-pound load placed 20 feet high at 10 feet of reach with a 24-inch load center, then identifies a 40-degree boom angle and a model-specific extension zone. Those details demonstrate a chart-reading example, not a reusable rating. They do not establish that another telehandler—or another attachment or lift position—can handle 5,000 pounds there.
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In that example, the angle and extension zone help identify a position on a particular model’s chart; they are not inputs to a transferable formula. The example should not be used to infer capacity for a different machine, a different attachment, or a different combination of height and reach. The number is useful because it illustrates how several chart details fit together, not because it serves as a standard rating.
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| Item to establish | What to verify | Where to verify it |
|---|---|---|
| Machine | Exact model and applicable chart | Machine identification and its operator documentation |
| Attachment | Approved attachment and chart applicability | Attachment identification and the machine’s chart or manual |
| Load | Known, reliable weight | Load documentation or another reliable weight source |
| Placement point | Required height and horizontal distance | Lift plan and the measurement references on the machine’s chart |
| Capacity result | Chart zone at the height-and-reach intersection; lower zone if the manual requires it at a boundary | Load chart and the machine-specific instructions for reading it |
| Actual boom position | Position is within the relevant chart envelope | Boom-angle and extension indicators, used as directed in the manual |
This checklist is useful because each row answers a different question. The machine and attachment establish which chart applies. The load weight and placement point establish what is being evaluated. The intersection and boundary instructions establish the chart capacity. Finally, the boom indicators help check that the actual position corresponds to the plan. Completing one part does not compensate for a missing part elsewhere.
Common mistakes that invalidate a capacity check
- Using only the maximum-capacity number. A maximum rating does not say what the machine can lift at every height and reach. Check the chart at the actual planned position.
- Borrowing a chart. A chart for another model, unit configuration, or attachment may describe a different operating envelope. Match the chart to the machine and attachment in use.
- Measuring reach from the wrong reference. The measurement reference can vary by chart. Use the one printed for your machine rather than assuming all manufacturers measure from the same point.
- Ignoring a zone boundary. When a position is on a division, follow the applicable manual’s rule. The Caterpillar TL943 manual directs operators to use the lower capacity at a boundary; do not assume the higher zone applies.
- Guessing the load weight or placement point. A chart result is meaningful only when the inputs are reliable. Resolve missing or uncertain information before operating.
- Assuming indicators make the lift acceptable. Boom indicators help establish position; they do not authorize a lift that exceeds the charted capacity.
- Interpolating beyond the manual’s directions. Do not invent a rating between chart zones, extend the chart beyond its stated envelope, or infer a capacity from another machine. If the chart does not clearly cover the planned point, get qualified guidance before lifting.
A related trap is treating an illustrative manufacturer example as a substitute for the actual chart. JLG’s 5,000-pound example is tied to stated conditions, including a 20-foot placement height, 10 feet of reach, a 24-inch load center, a 40-degree boom angle, and a model-specific extension zone. Leaving out any of those details—or applying them to another model—changes what the example can tell you. Use examples to understand how to read a chart, never to supply a missing rating.
Another mistake is to plan one point and then assume nearby positions carry the same capacity. The chart’s zones define the applicable limits; do not assume a small change in reach or height is immaterial. Follow the chart and the manual’s instructions for the actual position, including any direction for points that fall on a zone division. If the chart does not state how to handle an ambiguous point, do not make up a boundary rule.
When comparing telehandlers for a task
There is no meaningful universal ranking based on a single capacity number. For a known job, compare each candidate using its own chart and the actual task requirements:
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- The approved attachment that will be fitted and the chart that applies to it.
- Any load-center assumptions shown on the applicable chart or in the manual.
- Whether the chart covers the planned position and how its zone boundaries are handled.
- Whether the machine’s documented operating envelope fits the job’s site and placement constraints.
The available manufacturer guidance supports a model-and-attachment-specific comparison, not a cross-brand capacity ranking. Obtain the documentation for each exact machine under consideration and evaluate the same planned lift against each applicable chart.
To make the comparison fair, use the same task description for every candidate: the same load weight, intended placement height, horizontal reach, and attachment requirement. Then check each candidate’s own chart and its load-center assumptions. One machine’s headline maximum may be higher while its chart at the required height and reach does not answer the job’s need; only the relevant chart position can answer that question.
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Do not compare chart capacities without confirming that the chart conditions are comparable. If one candidate’s chart is for a different attachment, or the assumed load center differs, the figures may not describe the same configuration. The manufacturer material cited here does not provide a cross-brand dataset for ranking models, so a general list of “best” telehandlers by capacity would be misleading. Compare documented suitability for the particular lift instead.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Capacity limits and operator responsibility
Never operate above the applicable rated capacity. OSHA’s 29 CFR 1926.1417 states that covered equipment must not be operated in excess of rated capacity. OSHA’s 29 CFR 1926.1441 addresses equipment with a rated hoisting or lifting capacity of 2,000 pounds or less; that section requires the load chart and operator manual to be available for equipment within its scope and requires operator training on safe operation of the equipment type. The rule’s scope is limited, so determine which requirements apply to the particular equipment, work, and jurisdiction rather than assuming one provision covers every telehandler or job.
These provisions should not be collapsed into a blanket statement that one section governs every telehandler. Check the scope of the applicable rule for the equipment, work, and jurisdiction. Regardless of which specific provision applies, the machine’s manual and load chart remain essential for determining the rated capacity at a particular position. The chart is not optional background material for a lift decision.
An OSHA enforcement record from 2026 describes a case in which an employer’s operator overloaded a JLG 1055 telehandler after failing to follow the manufacturer’s load chart. The record quotes the JLG manual warning, “DO NOT exceed rated lift capacity.” It is a case-specific enforcement example; the applicable regulations and the machine’s own manual govern the lift.
The JLG/SkyTrak 10054 operator manual, revision 3/04, similarly warns, “DO NOT exceed rated capacities.” Such warnings express the central practical rule: determine the rating for the exact charted condition, and do not operate above it. A warning or example does not replace reading the correct chart for the machine and attachment in use.
What to do when the chart does not give a clear answer
Stop before lifting if the model or attachment does not match the chart, the load weight is uncertain, the measurement reference is unclear, the planned point is outside the chart, or the correct capacity zone cannot be identified. Do not fill a gap with a rating from a different machine or with your own interpolation. Obtain the correct operator manual and chart, and ask the manufacturer or an appropriately qualified person to resolve an unclear rating. Proceed only when the planned lift is within the applicable chart and the operator is trained and authorized for the equipment and work.
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In particular, do not treat uncertainty as permission to use the nearest chart value. If it is unclear whether the chart applies to the attachment, whether the measurement reference was used correctly, or which zone covers a planned point, resolve that specific issue first. Manufacturer instructions may give a boundary rule for one chart, as the CAT TL943 manual does; that does not authorize transferring the rule or its ratings to another machine.
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If the chart and the task do not line up, revise the plan only after confirming the new load position against the applicable chart. For a machine-selection decision, return to the exact task requirements and compare the candidates’ own charts. For an operating decision, rely on the machine’s operator documentation and qualified guidance, not on a generic capacity estimate. The safe result is a clear, documented match between the machine, attachment, load, planned position, and chart.
Frequently Asked Questions
Is there a formula for calculating telehandler capacity at a given boom height and reach?
There is no universal formula or capacity value. Use the load chart for the exact telehandler and approved attachment, locate the planned height-and-reach position, and compare the charted capacity with the known load weight. Do not derive a rating from boom angle, extension, or another model’s figures.
How do I measure reach for a telehandler load chart?
Use the measurement reference stated on the chart for your machine. JLG describes reach from the front face of the front tire, while the Caterpillar TL943 manual specifies distance from the front tires. Do not assume the reference is identical across models.
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Follow the boundary instruction in the applicable operator manual. The Caterpillar TL943 manual directs operators to use the lower capacity when the intersection lies on a zone boundary. Do not assume that same instruction applies to another chart unless its manual says so.
Can I use a chart from a similar telehandler or a different attachment?
No. Use the chart intended for the exact machine and attachment in use. Attachments can affect capacity, lift height, and reach, and another model’s chart may describe a different operating envelope.
What should I compare when choosing between telehandlers for a specific job?
Compare each exact model’s charted capacity at the job’s required height and reach, the approved attachment and applicable chart, any load-center assumptions, and whether the chart covers the planned position. A single maximum-capacity figure is not enough for a fair task comparison.
The Bottom Line
To check telehandler capacity at different boom heights and reach, establish the exact machine and approved attachment, the reliable load weight, and the planned placement height and horizontal distance. Read the matching chart, follow its boundary instructions, and verify the actual boom position with the machine’s indicators as directed by the manual. If the chart does not clearly cover the lift, stop and get qualified guidance; never exceed the applicable rated capacity.
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