The First Time Yield Calculator measures the efficiency of a process by showing what percentage of units pass through it without rework or repair. This metric is widely use in manufacturing, quality assurance, and production management to identify process effectiveness and reduce hidden costs due to rework.
It belongs to the Process Quality and Manufacturing Metrics calculator category. First Time Yield helps teams focus on quality improvement by evaluating how many units are correct the first time.
Formula of First Time Yield Calculator
First Time Yield = (Number of Good Units Produced / Total Units Entered) × 100
Where:
- Number of Good Units Produced: the number of units that successfully pass through the process without needing to be rework, fix, or re-inspect
- Total Units Entered: the total number of raw units that began the process
The final result is given as a percentage, showing how efficient the process is on the first pass.
For example, if 950 out of 1000 units are good on the first try:
First Time Yield = (950 / 1000) × 100 = 95%
Reference Table
| Total Units Entered | Good Units Produced | First Time Yield (%) |
|---|---|---|
| 100 | 100 | 100% |
| 200 | 180 | 90% |
| 500 | 475 | 95% |
| 1000 | 950 | 95% |
| 1000 | 850 | 85% |
| 1500 | 1350 | 90% |
This table offers quick insight into common outcomes for easy comparison and estimation.
Example of First Time Yield Calculator
Let’s say a production line processes 400 units in a shift. At the end of the process, 360 of those units are approved without any rework.
Step 1: Identify total units = 400
Step 2: Count good units = 360
Step 3: Apply the formula:
FTY = (360 / 400) × 100 = 90%
This means the first pass efficiency of this process is 90%.
Most Common FAQs
A good unit is one that goes through the process and passes all checks or inspections the first time, without requiring any fixes, adjustments, or rework.
First Time Yield helps organizations monitor and improve process performance. A low FTY indicates inefficiencies that lead to higher costs, more labor, and longer production times. Improving FTY means better quality and reduced waste.
Yes. In service sectors, First Time Yield can track tasks or transactions completed correctly the first time, such as customer service tickets resolved without follow-up or IT requests closed without escalation.