Measure twice, make once
Sampled project-time estimator
Scale a timed sample into a realistic working estimate with your own allowance.
Start with the calculator. Formula, assumptions, and limits are available when you need them.
Before you use this tool
Time a representative count of the same units used for the target: stitches, rows or motifs. Include assembly separately if the sample omits it.
Avoid adding breaks twice. The central estimate and range support scheduling; they are not a deadline guarantee or an assessment of skill.
Method and limits
Formula and assumptions
Observed minutes per unit are scaled to the target, selected complexity factor, and break allowance. The result shows a ±15% planning band for ordinary pace variation. Use comparable sample and project units; include breaks in the sample or allowance, but not both.
Worked example
Example: 50 units in 20 minutes, scaled to 500 units plus 15%, gives a 3.3–4.4 hour planning range around a 3.8 hour central estimate.
Limits and rounding
Results are planning estimates from the values entered. Displayed decimals are rounded for craft use; whole materials and repeats round up where the method says so. Confirm gauge, material behavior, construction, and finished measurements before committing supplies.