To size a forklift, work through four numbers in order: the heaviest load and its load centre, which set the rated capacity you need; the maximum lift height, which sets the mast; the narrowest aisle, which sets the truck class and turning radius; and the working environment, which sets the fuel type. Start with capacity. A forklift’s rated capacity applies at a standard 500 mm load centre, and the safe capacity falls as the load’s centre of gravity moves further from the forks — so a “3-ton” truck does not always lift 3 tons of a long or bulky load. The five steps below turn each of the four numbers into a spec, then match them to a real machine class. HONGLI builds forklifts from 1 to 10 tons; send your four numbers for a model recommendation.
Size a forklift in 5 steps (HowTo)
Take your heaviest load and where its centre of gravity sits. Match it to the truck’s rated capacity at that load centre, reading the load chart. Longer or bulkier loads need a higher-rated truck. 2. Lift height — Set the mast to your top beam or stacking height. Two-stage for general work; three-stage for high racking in a low building; full-free-lift for container loading. 3. Aisle width — Measure your narrowest working aisle. Tight aisles favour a three-wheel or reach truck with a small turning radius; wider aisles allow a four-wheel counterbalance. 4. Environment & fuel — Indoors or cold storage → electric (zero exhaust). Outdoors, rough or heavy → diesel. Match the fuel type to where the truck works. 5. Match to a model — Combine the four into a spec and pick the model. Confirm tyres (pneumatic for yards, solid for debris) and any attachments.
Why capacity is not just tonnage
Rated capacity is the load a forklift can carry safely at a stated load centre, usually 500 mm. The further a load’s centre of gravity sits from the fork face, the lower the safe capacity — which is why you read the load chart, not just the headline tonnage.
Quick sizing reference
| Your number | What it sets | Spec it drives |
|---|---|---|
| Heaviest load + load centre | Rated capacity | Truck tonnage (1–10 t at HONGLI) |
| Max lift height | Mast | Two-stage / three-stage / full-free-lift |
| Narrowest aisle | Truck class | Three-wheel / reach / counterbalance |
| Environment | Fuel type | Electric / diesel |
FAQ
How do I work out the capacity I need?
Take your heaviest load and its load centre, then read the load chart. Safe capacity falls as the load sits further from the forks.
Why can’t a 3-ton forklift always lift 3 tons?
Rated capacity applies at a 500 mm load centre. A longer load shifts the centre of gravity out, lowering the safe capacity.
Which mast do I need?
Two-stage for general work, three-stage to reach high racking in a low building, full-free-lift for container loading.
What forklift suits a narrow aisle?
A three-wheel or reach truck with a small turning radius — HONGLI’s three-wheel models turn down to about 1,660 mm.
What sizes does HONGLI offer?
Electric forklifts from 1 to 5 tons, diesel from 2 to 10 tons. Send your four numbers for a recommendation.
Related: /blog/forklift-capacity-load-center/ · /blog/forklift-mast-types/ · /forklifts/ · /get-a-quote/