Industrial engineering formula
The standard time for an operation or garment in minutes, built from observed time, performance rating and allowances.
SMV = observed time (s) / 60 × rating / 100 × (1 + allowance / 100)
| Symbol | Meaning | Unit |
|---|---|---|
| t_obs | Average observed cycle time | s |
| R | Performance rating (100 = standard pace) | % |
| A | Personal, fatigue and delay allowance | % |
Use it to set standard times from time study. Garment SMV is the sum of the operation SMVs and drives targets, efficiency, capacity and CM cost.
A side seam operation is timed at an average of 30 seconds. The observer rates the operator at 90% and the factory allowance is 15%.
SMV is the standard time to complete a task at a normal pace, including allowances. Learn what it includes, how it is set, how it drives targets, efficiency, capacity and CM cost, and where it goes wrong.
A step-by-step method to calculate operation and garment SMV from time study: define the method, time the cycles, remove abnormal readings, rate performance, add allowances and check the result.
SAM and SMV usually mean the same thing: standard time in minutes. This note explains where the two terms come from, when companies use them differently, and how to avoid confusion when comparing numbers.