- Enter your production output in total units for the period.
- Enter the time period (hours, shift, or day).
- Click Calculate to see throughput rate and capacity analysis.
The Throughput Formula
Understanding Throughput
Throughput is the single most important metric in the Theory of Constraints (TOC). It measures how much sellable product your system produces per unit of time. Unlike efficiency metrics that measure individual stations, throughput measures what matters: the output of the entire system.
In TOC accounting, profit is defined as Throughput minus Operating Expense. This reframes every decision: does this action increase throughput? If not, it does not improve profitability — no matter how much it reduces cost or improves local efficiency.
60/hr
35/hr
50/hr
Real-World Example
A production line runs 480 minutes and produces 350 good units across 2 shifts per day. Planned output was 400 units.
Per shift = 350 units | Per day = 700 units
Schedule adherence = 350/400 = 87.5% — behind by 50 units
The 5 Focusing Steps (Theory of Constraints)
Throughput Thinking vs Cost Thinking
✅ Throughput Thinking
- Maximize flow at the bottleneck
- Measure end-of-line output only
- Subordinate non-bottleneck stations
- Reduce batch sizes for faster flow
❌ Cost Thinking Pitfalls
- Maximizing utilization everywhere
- Measuring individual station efficiency
- Building inventory just to stay busy
- Cutting costs at the bottleneck
Schedule Adherence Guide
| Adherence | Rating | Action |
|---|---|---|
| 95-105% | On Target | Sustain current processes |
| 85-95% | Below Plan | Investigate specific shift/line gaps |
| Below 85% | Significant Gap | Root cause analysis on constraint |
| Above 105% | Over-producing | Rebalance or reduce batch sizes |
🎯 Key Takeaway
Your system throughput equals your bottleneck throughput. No amount of improvement at non-bottleneck stations will increase system output. Find the constraint, protect it, exploit it, and everything else follows. Use our Line Efficiency Calculator to see how balanced your stations are.
Frequently Asked Questions
What is throughput in manufacturing?
Throughput is the rate at which your system produces finished, sellable output. In the Theory of Constraints, throughput is the most important metric because it directly impacts revenue.
How do you increase throughput?
Identify your bottleneck (the slowest step), then exploit it by maximizing its uptime. Subordinate all other steps to the bottleneck pace. Only add capacity (elevate) if exploitation is not enough.
What is the difference between throughput and output?
Output counts all units produced, including defective ones. Throughput counts only good, sellable units. Producing 100 units but scrapping 10 means throughput is 90.
What is throughput accounting?
Throughput accounting measures profit as Throughput minus Operating Expense. Unlike cost accounting, it focuses on maximizing throughput rather than minimizing costs, which often leads to better decisions.
How does the bottleneck affect throughput?
The bottleneck determines total system throughput. No matter how fast other stations run, the system cannot produce faster than the bottleneck. Improving any non-bottleneck station will NOT increase throughput.
What is schedule adherence and why does it matter?
Schedule adherence compares actual output to planned output, expressed as a percentage. 100% means you hit your target exactly. Below 100% means you missed, which impacts delivery dates and customer satisfaction.
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