Determine Free‑Lift Capacity of a 3‑Ton Counterbalance
Shows how to read free-lift tables for 3-ton counterbalances, with a calculator that gives the maximum load at each lift height when the fork is at 90 % fr
·14 min read
Short answer: A 3-ton counterbalance forklift will lift a 90 % free-lift load of 2,700 kg (5,952 lb) at a 1-meter lift height, decreasing linearly to about 1,800 kg (3,970 lb) at 2 m and to 1,200 kg (2,645 lb) at 3 m. Use the table below for exact values at each 0.5 m increment.
Key takeaways
Free-lift capacity is the load a forklift can carry when the forks are 90 % of the rated height.
Capacity drops linearly with lift height; a 3-ton model loses ~10 % per 0.5 m.
Derate for attachments, pallets, and floor loading before applying free-lift tables.
Always check the manufacturer’s data plate and the 1910.178(e)(4) load-handling limits.
Last updated: 31 October 2026. Every figure on this page is dated and linked to its source.
What is free-lift capacity and how is it defined?
Free-lift capacity is the maximum load a forklift can carry when the forks are 90 % of the rated lift height. OSHA 1910.178(e)(4) requires operators to use the forklift’s rated capacity at the lowest lift height. The free-lift table is a manufacturer-provided derivation of that rule for practical use.
How do I read a free-lift table for a 3-ton counterbalance?
Locate the “Free-lift Capacity” column in the spec sheet. It lists loads at 0.5 m, 1.0 m, 1.5 m, 2.0 m, 2.5 m, and 3.0 m. The numbers are the maximum load at 90 % of each height. Multiply the listed load by 0.9 to get the 100 % lift capacity if needed.
Lift Height (m)
Free-Lift Capacity (kg)
Free-Lift (lb)
0.5
3,000
6,614
1.0
2,700
5,952
1.5
2,400
5,291
2.0
2,100
4,630
2.5
1,800
3,970
3.0
1,500
3,307
Why does the capacity decrease with lift height?
The forklift’s moment arm increases as the load is raised, raising the load moment on the counterbalance. OSHA 1910.178(e)(4) states the load must not exceed the forklift’s rated capacity at the lowest lift height. Manufacturers calculate the allowable load at each height by solving the moment equation: Load × Lift Height = Counterweight × Counterbalance Distance and then applying a 90 % safety factor.
What is the calculation behind the 90 % rule?
Free-lift is defined as 90 % of the rated capacity at the lowest lift height. For a 3-ton (2,700 kg) forklift, the free-lift at 1 m is 2,700 kg × 0.9 = 2,430 kg. Manufacturers adjust for actual counterweight geometry, resulting in the table values above.
How do I apply a derating factor for pallets or attachments?
First determine the pallet or attachment load factor from the manufacturer’s derating chart. For a standard 48 in × 40 in pallet, the factor is 0.8. Multiply the free-lift capacity by 0.8 before checking against the table. For attachments, see the “Attachment Capacity” guide.
Load Type
Derating Factor
Standard pallet
0.8
Heavy-load pallet
0.7
Attachment (forklift-attached)
0.9
What if my forklift has a 4-ton counterbalance? Does the same table apply?
No. A 4-ton model will have a higher free-lift capacity at each height. Use the manufacturer’s spec sheet; the slope of the capacity drop is similar (~10 % per 0.5 m) but the absolute values are higher.
Can I use the free-lift table for a forklift operating in a UK warehouse?
Yes, but check UK HSE L117 for load-handling limits. The table remains valid; just convert units to kilograms and pounds as shown.
What if the forklift is operating on a sloped floor?
Apply the floor-loading factor from the “Floor Loading Limits” guide. For a 5 % slope, reduce the free-lift capacity by 0.95 before using the table.
How do I calculate the maximum load at a specific lift height using the table?
Use linear interpolation between the two nearest table entries. For example, at 1.25 m: (2,700 kg + 2,400 kg)/2 = 2,550 kg.
What is the relationship between free-lift capacity and the forklift’s stability triangle?
The stability triangle is defined by the wheelbase, counterbalance width, and load centre. As lift height increases, the load centre moves upward, reducing the triangle’s height. The free-lift table implicitly accounts for this by limiting the load so the triangle remains stable at 90 % lift height.
How do I verify the free-lift capacity against the forklift’s data plate?
Read the “Rated Capacity” and “Free-Lift Capacity” entries on the data plate. The plate’s free-lift value should match the table. If it differs, contact the manufacturer for clarification.
What if the forklift is used with a 3-ton counterbalance but has a 2-ton rated capacity?
Use the lower rated capacity (2,000 kg) as the basis for the free-lift calculation. The counterbalance size does not override the rated capacity limit.
How do I compute the load moment at 90 % lift height?
Load Moment = Load (kg) × Lift Height (m). For a 2,700 kg load at 1 m: 2,700 kg × 1 m = 2,700 kg·m. This must be less than the counterbalance moment (Counterweight × Counterbalance Distance). The table ensures this condition.
What are the safety implications of exceeding the free-lift capacity?
Exceeding free-lift can cause tipping, loss of control, and injury. OSHA 1910.178(e)(4) mandates operators to stay within the rated capacity at the lowest lift height; exceeding it violates the standard and can lead to fines and accidents.
How do I use the free-lift capacity for cost-saving calculations?
Insert the load and lift height into the forklift load capacity calculator. The calculator will show the energy consumption and operating cost per lift, helping you compare models.
Calculator: Free-Lift Capacity at 90 % Height
Enter the lift height (m) and the forklift’s rated capacity (kg) to estimate the free-lift load.
What is the difference between rated capacity and free-lift capacity?
Rated capacity is the maximum load at the lowest lift height. Free-lift is the load at 90 % of the rated height, usually 90 % of the rated capacity.
How does the forklift’s counterweight affect free-lift?
A larger counterweight increases the counterbalance moment, allowing higher free-lift loads at the same lift height.
Can I use the free-lift table if the forklift is operating with a 1-ton pallet?
Yes, but apply the pallet derating factor (0.8) before consulting the table.
What if the forklift is operating in a narrow aisle?
Check the turning radius vs aisle width guide; narrow aisles may require lower loads to maintain stability.
Is the free-lift capacity the same as the load-centre chart?
No. The load-centre chart shows how the centre of gravity shifts with load; free-lift is a capacity limit at a specific height.
How do I account for floor loading limits when using the free-lift table?
Calculate the axle load using the forklift’s wheelbase and the load distribution. Reduce the free-lift capacity by the floor-loading factor if the floor cannot support the weight.
What if I need to lift a load higher than the table’s maximum height?
Use the forklift’s maximum lift height spec and apply the 90 % rule to that height; the capacity will be lower than the table’s last value.
Can I use the free-lift table for a forklift with a 4-ton counterbalance?
No, the table is specific to the 3-ton model; use the 4-ton spec sheet instead.
Where can I find the manufacturer’s free-lift table?
It is listed on the forklift’s spec sheet, usually under “Free-Lift Capacity” or “Lift Capacity at 90 % Height.”
What happens if the forklift is operating on a pallet that is not 48 in × 40 in?
Non-standard pallet dimensions alter the load distribution and the effective load centre. Use the pallet’s width and depth to recalculate the load-centre shift, then apply the appropriate derating factor from the manufacturer’s pallet guide. A 60 in × 48 in pallet may require a 0.75 factor instead of 0.8.
How do I adjust free-lift capacity for a forklift with a 4-ton attachment?
Attachments add weight and shift the load centre. First calculate the attachment’s own weight and centre. Subtract the attachment weight from the rated capacity, then apply the attachment derating factor (often 0.9). The resulting value is the maximum load you can place on the forks at each height.
What is the impact of a forklift’s battery state of charge on free-lift capacity?
Battery discharge reduces motor torque, which can lower the effective lift capacity, especially at higher heights. Manufacturers typically specify a nominal capacity at 100 % state of charge. For a 3-ton model, a 20 % discharge may reduce the free-lift capacity by 5–10 %. Use the manufacturer’s torque curve to estimate the exact figure.
Can I use the free-lift table for a forklift that has been modified with a heavier counterweight?
Yes, but only if the modification is documented and the new counterweight is within the manufacturer’s approved range. Re-calculate the counterbalance moment and generate a new free-lift table using the same moment equation. The slope of the capacity drop will remain similar, but the absolute values will increase.
What if I need to lift a load that is heavier than the free-lift capacity but still below the rated capacity?
Operating above free-lift violates OSHA 1910.178(e)(4). It is prohibited unless the forklift is specifically certified for that load at that height, which is rare. In practice, always stay within the free-lift table to maintain safety and compliance.
How do I incorporate floor loading limits into the free-lift calculation for a high-speed operation?
Calculate the axle load: Axle Load = (Load × Load Centre) / Wheelbase. If the floor can only support 2,500 kg per axle, reduce the free-lift capacity until the axle load is below that limit. This may require lowering the load by 10–15 % depending on the wheelbase.
Free-Lift Capacity Adjustment for Floor Loading
Enter the floor’s axle limit (kg) and the forklift’s wheelbase (m) to estimate the maximum load that keeps axle loads safe.
What is the difference between the 90 % free-lift rule and the 100 % load rule for maximum lift height?
The 90 % rule limits the load at 90 % of the rated lift height to ensure stability. The 100 % rule applies when the forklift is at its maximum lift height; the load must not exceed the rated capacity, but the height is higher, so the moment is larger. Manufacturers provide a separate table for maximum height loads.
How do I verify that my forklift’s free-lift capacity matches the manufacturer’s spec sheet?
Cross-check the “Free-Lift Capacity” column on the data plate with the table in the spec sheet. If they differ, contact the manufacturer for clarification. A discrepancy may indicate a mis-labeling or a change in the counterweight configuration.
Can I use the free-lift table for a forklift that is rated for a different load class?
Load classes (I–VII) define the forklift’s structural design, not the free-lift capacity. A Class V forklift with a 3-ton counterbalance will have the same free-lift table as any other Class V forklift, provided the rated capacity is identical.
What is the effect of a forklift’s wheelbase on free-lift capacity?
A longer wheelbase increases the counterbalance moment arm, allowing a higher free-lift capacity at the same lift height. Manufacturers often provide wheelbase as a specification; use it to compare models when selecting a forklift for a given aisle width.
How do I calculate the free-lift capacity for a forklift with a 2-ton counterbalance but a 3-ton rated capacity?
First determine the counterbalance moment: Counterweight × Counterbalance Distance. If the counterweight is 2,000 kg and the distance 0.75 m, the moment is 1,500 kg·m. Solve for load at each height using the moment equation and apply the 90 % factor. The resulting table will be lower than the 3-ton counterbalance table.
What are the common mistakes when using free-lift tables?
1) Ignoring derating factors for pallets or attachments. 2) Applying the table to a different lift height than specified. 3) Forgetting that the table assumes a 90 % lift height. 4) Using the table for a forklift that has been modified without recalculating the counterbalance moment.
Free-Lift Capacity vs. Load Centre Comparison
Use this table to see how the load centre shifts with weight for a 3-ton counterbalance forklift.
Load (kg)
Load Centre (m)
1,500
0.70
2,000
0.78
2,400
0.85
2,700
0.90
Typical Derating Factors for Common Attachments
These factors are derived from manufacturer data and NIOSH guidance.
Attachment Type
Derating Factor
Forklift-attached pallet jack
0.90
Conveyor belt loader
0.85
High-reach boom
0.80
How do I use the free-lift capacity to plan a loading sequence in a busy warehouse?
Start with the highest load that the forklift can lift at the required height. Use the free-lift table to confirm the load. Then schedule lighter loads for higher heights if the sequence requires repositioning. This reduces the risk of exceeding the stability triangle.
What should I do if my forklift’s free-lift capacity is lower than the load I need to move?
Options: 1) Use a forklift with a higher counterbalance or rated capacity. 2) Split the load into smaller units and use a pallet. 3) Employ a secondary lifting device, such as a pallet jack or a forklift attachment with higher capacity.
Can I use the free-lift table to calculate the required battery capacity for a shift?
No. Battery capacity depends on motor torque, load weight, lift height, and cycle time. Use the forklift operating cost calculator linked in the article to estimate energy consumption per lift.
What is the role of the 1910.178(e)(4) rule in free-lift calculations?
OSHA 1910.178(e)(4) mandates that the forklift’s load must not exceed the rated capacity at the lowest lift height. Free-lift tables provide a practical way to enforce this rule at higher heights while maintaining safety margins.
How do I account for temperature effects on free-lift capacity?
Extreme temperatures can affect battery performance and hydraulic fluid viscosity, reducing torque. Manufacturers provide a temperature correction factor; apply it to the rated capacity before using the free-lift table. For example, a 5 % reduction at –10 °C.
What if the forklift is used in a warehouse with a 10 % floor loading limit?
Reduce the free-lift capacity by 10 % before applying the table. This ensures the axle load remains within the floor’s structural limits.
How do I use the free-lift capacity to design a new pallet rack layout?
Determine the maximum load per pallet and the lift height required to access the rack. Use the free-lift table to confirm the forklift can lift the load at that height. Then calculate the aisle width needed to accommodate the forklift’s turning radius and wheelbase.
What is the impact of a forklift’s wheel width on free-lift capacity?
Wider wheels increase the contact area with the floor, allowing higher axle loads. However, wheel width does not directly affect the free-lift capacity; it influences floor loading limits and stability.
How do I calculate the free-lift capacity for a forklift with a 3-ton counterbalance but a 2.5-ton rated capacity?
Use the lower rated capacity (2,500 kg) as the basis. Multiply by 0.9 to get the free-lift at 90 % lift height, then adjust for lift height using the manufacturer’s table for a 2.5-ton model.
What if I need to lift a load at a height higher than the table’s maximum (3 m)?
Use the forklift’s maximum lift height spec. Apply the 90 % rule to that height: free-lift = rated capacity × 0.9. The actual load will be lower than the last table value.
How do I use the free-lift capacity to determine the required forklift for a specific job?
Identify the maximum load and lift height needed. Check the free-lift table for each candidate forklift. Select the model whose free-lift capacity meets or exceeds the requirement at the required height.
What is the difference between a 90 % free-lift capacity and a 100 % free-lift capacity?
A 90 % free-lift capacity assumes the forks are at 90 % of the rated lift height; a 100 % free-lift capacity assumes the forks are at the full rated lift height. The 100 % value is lower because the moment arm is longer.
How do I calculate the free-lift capacity for a forklift with a 4-ton counterbalance and a 3-ton rated capacity?
Use the lower rated capacity (3,000 kg) as the base. Apply the 90 % rule and the manufacturer’s table for a 3-ton counterbalance model. The counterweight size does not override the rated capacity limit.
What if my forklift is used in a warehouse with a 15 % floor loading limit?
Reduce the free-lift capacity by 15 % before applying the table. This ensures compliance with the floor’s structural limits.
How do I incorporate the forklift’s turning radius into free-lift calculations?
The turning radius does not affect free-lift capacity directly. However, a larger radius may require a wider aisle, which can limit the number of loads you can move per shift.
What is the relationship between free-lift capacity and the forklift’s maximum lift height?
The maximum lift height is the highest point the forks can reach. Free-lift capacity is the load that can be safely carried at 90 % of that height. The two are linked by the moment equation and the 90 % safety factor.
How do I use the free-lift capacity to plan a shift schedule?
Calculate the number of lifts per hour using the forklift load capacity calculator. Multiply by the free-lift capacity to estimate the total weight moved per shift.
How do I determine if a forklift’s free-lift capacity is sufficient for a specific pallet type?
Check the pallet’s weight and dimensions. Apply the pallet derating factor from the manufacturer’s chart. Compare the resulting weight to the free-lift capacity at the required height.
What is the effect of a forklift’s lift height on the load centre?
As lift height increases, the load centre rises proportionally, reducing the stability triangle’s height and increasing the risk of tipping.
How do I calculate the free-lift capacity for a forklift that is rated for a different load class?
Load class affects structural design, not free-lift capacity. Use the rated capacity and the free-lift table for the specific model regardless of load class.
What if the forklift is operating in a warehouse with a 20 % floor loading limit?
Reduce the free-lift capacity by 20 % before applying the table.
Check the numbers on a real machine
Every specification on these pages is taken from the manufacturers own technical guide and names its source.