Capacity Requirements Planning (CRP

Manufacturing Operations: Capacity Requirements Planning (CRP)

In Material Requirements Planning (MRP II) and Enterprise Resource Planning (ERP) systems, Capacity Requirements Planning (CRP) validates whether the detailed master production schedule is physically executable given finite factory floor resources:

• Rough-Cut Capacity Planning (RCCP) vs. CRP:

• RCCP: High-level feasibility check at the Master Production Schedule (MPS) level focusing only on critical bottleneck work centers.

• CRP: Detailed, component-by-component finite capacity analysis evaluating every routing step, setup time, and run time across all machines and labor teams.

• Utilization vs. Efficiency:

• Utilization (Uptime): The percentage of scheduled time the machine is actively available to run (accounts for maintenance, meetings, and idle time).

• Efficiency (Pace): The actual production speed of the operator/machine relative to established engineering standard time.

• Resolving Capacity Overloads: Strategies include scheduling weekend/evening overtime, splitting batches across parallel machines, offloading to third-party toll manufacturers, or rerouting to secondary work centers.

How to Use This Calculator

Enter your Planned Production Batch Quantity (Units) (e.g. 1,200), Setup / Changeover Time (Hours per Batch) (e.g. 4.5), Standard Run Time per Unit (Hours/Unit) (e.g. 0.25 (15 minutes per unit)), Scrap & Rework Yield Allowance (%) (e.g. 5 (5% extra parts for scrap)), Number of Available Work Centers / Machines (e.g. 3), Operating Hours per Shift (Hours/Shift) (e.g. 8), Number of Shifts per Day (e.g. 2), Work Days in Planning Period (Days) (e.g. 5 (Weekly planning window)), Work Center Availability Utilization (%) (e.g. 85 (85% uptime)), and Work Center Operator / Machine Efficiency (%) (e.g. 90 (90% standard pace)). Results update instantly as you type — adjust any value to compare scenarios.

The Formula

Capacity Requirements Planning (CRP) \& Rated Work Center equations:

Required Run Hours = [Batch Units × (1 + Scrap Rate)] × Run Time per Unit

Total Required Capacity Load = Setup Time + Required Run Hours

Gross Clock Available Hours = Machines × Hours/Shift × Shifts/Day × Days

Rated Available Capacity = Gross Available Hours × Utilization × Efficiency

Capacity Load Ratio (\%) = (Total Required Capacity Load) / (Rated Available Capacity) × 100\%

Capacity Variance = Rated Available Capacity - Total Required Capacity Load

Worked Example

For example, evaluating a manufacturing cell with 3 CNC machines operating 2 shifts of 8 hours across a 5-day week), with 85% utilization and 90% efficiency: Rated capacity is . Planning a production batch of 1,200 units with 5\% scrap allowance (1,260 gross units) requiring \ and 4.5 hr setup: Required load is \ = 4.5 + 315 = 319.50 standard hours. Capacity Load Ratio is .

Understanding Your Result

Evaluate your result in the context of your specific use case and relevant industry standards or reference values. A single calculated result is a starting point — test two to three scenarios to understand how sensitive the outcome is to your key input assumptions. For high-stakes decisions, verify your result against a secondary source or subject-matter expert before acting.