Industrial engineering calculator
Build a garment SMV from observed operation times: enter each operation's observed time in seconds and performance rating, add an allowance, and get basic time, SMV per operation and total garment SMV.
Method note: Rating scales and allowance policies differ between companies and predetermined time systems.
Garment SMV
4.853min
| Operation | Basic time (min) | SMV (min) |
|---|---|---|
| Shoulder join (overlock) | 0.348 | 0.401 |
| Neck rib join | 0.5 | 0.575 |
| Neck top stitch | 0.39 | 0.448 |
| Sleeve attach | 0.8 | 0.92 |
| Side seam close | 0.91 | 1.047 |
| Sleeve hem | 0.538 | 0.619 |
| Bottom hem | 0.5 | 0.575 |
| Care label attach | 0.233 | 0.268 |
Operation SMV = observed seconds / 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 | % |
Garment SMV = sum of all operation SMVs
For each operation, basic time = observed time (converted to minutes) × rating / 100. The calculator adds the basic times, then applies the allowance: garment SMV = total basic time × (1 + allowance / 100). A table shows the basic time and SMV for each operation.
See SMV calculation and time study for the full method.
The default operation list is a basic T-shirt with eight operations and a 15% allowance. For example, sleeve attach is observed at 48 seconds and rated 100: basic time = 48 / 60 × 1.00 = 0.800 min, and SMV = 0.800 × 1.15 = 0.920 min.
For the whole garment:
The garment SMV is the standard time for one garment by one operator at standard pace. Use it for line efficiency, production targets and CM cost. The per-operation SMVs feed line balancing. Record the method and conditions with the SMV, because a different method needs a new study.
The performance rating from your time study, where 100 is standard pace. A faster operator is rated above 100 and a slower one below 100.
Your factory's agreed allowance for personal needs, fatigue and small delays. Apply the same policy to every operation.
Enter the SMV in seconds with a rating of 100 and an allowance of 0 if the values already include allowances.
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.
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.
How to carry out a stopwatch time study on a sewing operation: break it into elements, take enough cycles, rate the operator's pace, add allowances and arrive at a standard time. With a worked example and the mistakes that spoil results.
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.
Work study combines method study (finding a better way to do a job) and work measurement (setting the time for it). An introduction for garment factories: the steps, the tools and how the results feed SMV, line balancing and costing.