How many forklifts does a warehouse need?
A warehouse needs enough forklifts to finish the pallet moves of its busiest hour, plus any standby trucks it chooses to keep. That number follows from three things: how many moves the peak hour has, how long one move takes, and how many productive minutes one truck gives in an hour once breakdowns, charging and waiting are taken off.
The calculator uses the vehicle-based material handling model in M. P. Groover's textbook Automation, Production Systems, and Computer-Integrated Manufacturing: the workload of the hour divided by the time one vehicle has, rounded up. It then checks how much each forklift you own is really used, and what the fleet costs per hour used and for trucks above the need.
Why size the forklift fleet from data?
- Every truck carries a fixed cost: lease or depreciation, insurance and maintenance whether it works or not. In Dubai, Municipality guidelines also require forklifts to be examined and certified by an EIAC-accredited third party, with the technical guideline setting this every year.
- Trucks bought for one busy season stay: the fleet grows at each peak and rarely shrinks after it.
- Travel is usually the larger part of a move: the calculator shows the split, so you can see whether moving fast-moving stock closer to the dock would save more than another truck.
- Hour meters tell the truth about use: two trucks used 10% of the time are usually one truck too many.
What inputs do you need?
| Input | Where to find it | Tip |
|---|---|---|
| Pallet moves in the peak hour | WMS task history, or a count on a busy day | Use the busiest regular hour, not the record day of the year. |
| Pick-up and set-down time | A stopwatch on 10 to 20 moves | High racking takes longer than floor stacking; time both if you have both. |
| Travel distances and speed | Warehouse layout, a measured route and its travel time | Speed is the average with stops, well below the posted limit. |
| Availability and traffic factor | Maintenance records, charging schedule, observation | Charging or battery changes during the shift lower availability. |
| Hours used per truck | Hour meters, or engine and activity hours from a tracking system | Read every meter on the same day at the start and end of the period. |
| Costs | Lease contracts, service invoices, energy bills | The Equipment Hourly Cost Calculator builds the cost of one machine in detail. |
How is it calculated?
Trucks needed in the peak hour
This is Groover's model for vehicle-based systems: delivery cycle time, available time per vehicle (60 × A × Tf × E) and the number of vehicles as workload divided by available time. The textbook notes that the result must be rounded up and that queues at pick-up and set-down points can call for more vehicles.
Measured use and cost
The cost of surplus trucks counts only their fixed and maintenance cost: their working hours move to the trucks you keep, so energy stays the same.
Sources
- Vehicle-based material handling: M. P. Groover, Automation, Production Systems, and Computer-Integrated Manufacturing, ch. 10, §10.6 (equations 10.1 to 10.6 and Example 10.1, with A = 95%, Tf = 90%), as taught in NIT Srinagar course MEC 405. Source: course notes.
- Third-party examination of forklifts in Dubai: Dubai Municipality, Technical Guidelines for Examination and Certification of Cranes, Hoists, Lifts and Other Lifting Equipment (GU48, version 5). Source: Dubai Municipality.
- Annual certification of forklifts and attachments: Dubai Municipality, Safe Forklift Operations technical guideline (DM-HSD-146-FL2, version 1.0), section 4.5. Source: Dubai Municipality. Last reviewed 21 October 2026.
Worked example: 60 pallet moves in the peak hour
The defaults are examples in US dollars; replace them with your own figures.
- Each move takes 0.5 min to pick up and 0.5 min to set down, with 60 m loaded and 60 m empty at 6 km/h (100 m a minute): travel is 1.2 min and the whole move 2.2 minutes, 55% of it travel.
- 60 moves × 2.2 min = 132 truck-minutes of work in the hour. One truck gives 60 × 0.95 × 0.90 × 1.00 = 51.3 productive minutes.
- 132 ÷ 51.3 = 2.57, so the peak needs 3 forklifts, each busy 86% of its available time. The site has 5: 2 above the need.
- The hour meters agree: over 26 days of two 8-hour shifts (416 scheduled hours), the five trucks worked 330, 300, 250, 110 and 45 hours, 50% on average. At a 70% target, the 1,035 hours justify 4 trucks.
- At $9,000 fixed and $2,500 maintenance per truck a year and $1.20 of energy per hour, five trucks working 2,400 hours each cost $71,900 a year, $5.99 per hour used. The 2 trucks above the need cost $23,000 a year.
The peak model gives 3 and the meters 4 because meters count all key-on time, waiting included, while the model counts productive minutes. Both point to at least one truck too many.
How to read your results
- Trucks needed is the minimum for the peak hour; round-up headroom and standby trucks come on top.
- Travel share above half the move time means layout and slotting matter more than truck count.
- Trucks below your target are the first to pool between shifts or areas, move to another site or return at lease end.
- Utilization above 100% means the meter hours are higher than the scheduled hours: check the readings or the shift pattern.
How to run the same work with fewer forklifts
- Cut travel: put fast-moving stock nearest the dock and plan put-away and replenishment so trucks rarely run empty.
- Spread the peak: move replenishment and put-away out of the dispatch hour.
- Pool trucks: a shared truck between two zones replaces two trucks used part of the day.
- Measure hours per truck every month: with meters read on the same day, or from a tracking system, and track the trend with the Fleet Vehicle Utilization Calculator.
- Keep every truck safe to use: a truck parked with an open defect is lost capacity; the Forklift Daily Pre-Use Checklist logs defects until they are fixed.
Assumptions and limits
The peak model uses averages: it does not simulate queues at docks or in narrow aisles, battery changes in the middle of the peak or trucks of different types that cannot replace each other. Size each truck type (counterbalance, reach truck, pallet truck, order picker) separately. Every default, target and cost is an example; the tool has no benchmark figures of its own. This is a planning aid, not engineering, safety or financial advice.