Formula Used
Station capacity = machines × operating minutes per day ÷ processing minutes per job.
Utilization = demand ÷ station capacity × 100.
System capacity = the lowest station capacity.
Expected throughput = the lower value of demand and system capacity.
Required machines = ceiling of demand ÷ capacity per machine ÷ target utilization.
Lead time estimate = work in process ÷ expected throughput.
Net benefit = incremental contribution over the horizon − added machine investment.
How to Use This Calculator
- Enter the average Littlefield demand in jobs per day.
- Add the current WIP and operating hours.
- Choose a target utilization level for safe capacity.
- Enter revenue, variable cost, and added machine cost.
- Enter machines and process minutes for each station.
- Press the calculate button to see the bottleneck and plan.
- Download the CSV or PDF report for your records.
Example Data Table
| Scenario |
Demand |
Station 1 |
Station 2 |
Station 3 |
Target utilization |
Purpose |
| Base case |
24 jobs/day |
1 machine, 45 min |
2 machines, 60 min |
1 machine, 30 min |
85% |
Check current bottleneck |
| Growth case |
36 jobs/day |
1 machine, 45 min |
2 machines, 60 min |
1 machine, 30 min |
80% |
Test demand surge |
| Balanced case |
36 jobs/day |
2 machines, 45 min |
2 machines, 60 min |
1 machine, 30 min |
85% |
Review machine purchase |
About Littlefield Capacity Planning
Littlefield simulation rewards fast capacity choices. Demand arrives each day. Orders move through stations. Each station has machines and a processing time. The slowest station limits the whole system. This calculator turns those facts into numbers you can use.
Why Capacity Matters
Capacity tells how many jobs a station can finish in one day. Utilization tells how hard the station is working. High utilization looks efficient, but it also creates long queues. A station near full load has little room for random arrivals. A small delay can spread through the line. Littlefield teams often lose cash because they buy too late. They may also waste cash by buying too many machines. A balanced plan is better.
What the Tool Shows
Enter daily demand, operating hours, WIP, target utilization, prices, costs, and machine data. The tool computes station capacity, bottleneck rate, expected throughput, capacity gaps, and recommended machines. It also estimates lead time from Little’s Law. This is useful when you want to compare queue pressure with contract lead times. The payback area links operations choices with profit. It checks whether extra machines can create enough contribution to cover their purchase cost.
How to Read Results
Start with the bottleneck station. If its utilization is above the target, it is a strong buying candidate. Then review the required machines column. This value shows how many machines are needed to serve demand at the chosen utilization limit. A lower target gives more buffer. A higher target saves cash, but increases waiting risk.
Practical Tips
Run several scenarios before making a decision. Try higher demand first. Then test lower demand. Compare the net benefit and payback days. Do not buy only because utilization is high. Check the remaining game days and contribution per job. A late machine may never repay itself. Also watch WIP. Large WIP can mean demand is already trapped inside the system. In that case, capacity relief may improve lead time quickly. Use the exported report to record each scenario and explain your Littlefield decision. Finally, match every calculation with the scoreboard. Cash balance, order timing, and contract rules still matter. Capacity is only one lever, but it is often the lever with the biggest effect.
FAQs
What is Littlefield capacity?
Littlefield capacity is the maximum job flow your simulated factory can process. It depends on machines, processing time, and operating hours at each station.
How does this calculator find the bottleneck?
It computes the daily capacity of every station. The station with the lowest capacity is marked as the bottleneck because it limits total throughput.
What does utilization mean?
Utilization shows how much of a station’s capacity is consumed by demand. Very high utilization can create long queues and late orders.
Why should I use target utilization?
Target utilization gives your system a buffer. It helps you avoid running stations too close to full load when arrivals vary.
How many machines should I buy?
Review the additional machines column. It estimates the machines needed to meet demand while staying under your chosen utilization target.
What does the lead time estimate mean?
Lead time uses Little’s Law. It divides current WIP by expected throughput to estimate how long orders may stay in the system.
Can this predict exact simulation results?
No. It gives planning estimates. Actual Littlefield results can vary because arrival timing, queue rules, contracts, and cash timing also matter.
Why include CSV and PDF downloads?
Downloads help you compare scenarios. You can save results, submit analysis, or document why a capacity decision was made.