Rolled Throughput Yield (RTY) & First Time Yield (FTY) (2024)

FAQs

How do you calculate RTY and FTY? ›

The key difference between Rolled Throughput Yield and First Time Yield is that RTY considers the total number of defects in a multi-step process, while FTY only focuses on the defects in the first step.

FTY is unit sensitive, meaning it does not take into account whether the output unit is defective, and is calculated by dividing the number of units produced from a process by its inputs. It does not capture how many defects were found and corrected within a single unit.

You can multiply the individual throughput yields at each process step to obtain the overall, rolled throughput yield. When you calculate throughput yield, you count only the units that make it through the process without rework or scrap.

First pass yield = (number of good units produced / total number of units produced) x 100First pass yield refers to the turnout of a production cycle or the number of goods a company can actually sell to customers after the production process.

First Time Yield (FTY):

FTY is typically expressed as a percentage, ranging from 0% (no units pass) to 100% (all units pass). For example, if a manufacturing process produces 900 units and 800 units pass all quality checks without any need for rework or repair, the FTY would be 800/900 or approximately 88.9%.

Rolled throughput yield is the probability of a product or service making it through the entire process without having a single defect. Ideally, you want this value to be 100%, but that can only happen if all products pass each process step 100% of the time.

To calculate the yield of a square inch of film, multiply the thickness (gauge) by the density, then divide by 27.68.

For stocks, yield is calculated as a security's price increase plus dividends, divided by the purchase price.

First Time Yield (FTY): The ratio of the number of good “units” coming out of the process to the number of “units” going in. Rolled Throughput Yield (RTY): The probability that the process produces a good “unit” the first time through.

How to calculate right first time? ›

First time right defined

It boils down to this formula: FTR = (number of usable products divided by the total number of products) x 100.

The term throughput time comes from the measure of throughput - or the business process flow rate. Throughput is the measure of inputs and outputs within a process and is an important aspect of business process management.

Throughput rate calculations can help a business determine the rate at which deliverables reach consumers. Sometimes referred to as flow rate, this information can help a business make knowledgeable decisions about the production process from investment to production to revenue.

Rolled Throughput Yield (RTY) is the probability that a single unit can pass through a series of process steps free of defects. If you will remember, the First Time Yield calculation we did (FTY) considered only what went into a process step and what went out. Rolled Throughput Yield adds the consideration of rework.

It is obtained by counting the defect-free units that successfully complete the entire process divided by the total units entered the process. In other words, if the number of units at the end of the process equals to what they were at the beginning, then the final yield would be 100 percent.

RTY: Using an Estimate of Yield

It is also possible to “estimate” Yield by taking the inverse of DPU or simply subtracting DPU from 1. Referring to the table above, let's run a quick yield estimation. RTY using the Yield Estimation Method = 0.89*0.91*0.99*0.98*0.97 = 0.76 or 76% very close!

You can follow these steps to calculate yield: Determine the market value or initial investment of the stock or bond. Determine the income generated from the investment. Divide the market value by the income.

The formula is EP weight ÷ AP weight × 100 = yield %. Yield percentage is important because it tells you several things: how much usable product you will have after processing; how much raw product to actually order; and the actual cost of the product per dollar spent.