Drawing scale calculator
Measure something on a printed sheet, get the real dimension. Work the other way to check a drawing’s scale against a dimension it states. Metric and imperial. Nothing leaves this page.
What is it really?
A sheet printed at anything other than full size is the usual reason a measurement disagrees with a stated dimension. Check one dimension the drawing prints before you trust the rest.
How long will it draw?
What scale is this drawing?
Find a dimension the drawing states, measure that same line on the sheet, and put both here.
The nearest standard scale is named only when the number lands within a few per cent of it. A ratio between two scales usually means the print was resized.
Metric and imperial
What size is the sheet in front of you?
| Sheet | Millimetres | Inches |
|---|---|---|
| ISO A0 | 841 × 1189 | 33.1 × 46.8 |
| ISO A1 | 594 × 841 | 23.4 × 33.1 |
| ISO A2 | 420 × 594 | 16.5 × 23.4 |
| ISO A3 | 297 × 420 | 11.7 × 16.5 |
| ISO A4 | 210 × 297 | 8.3 × 11.7 |
| ANSI B (Ledger) | 279 × 432 | 11 × 17 |
| ANSI D | 559 × 864 | 22 × 34 |
| ANSI E | 864 × 1118 | 34 × 44 |
| ARCH D | 610 × 914 | 24 × 36 |
| ARCH E1 | 762 × 1067 | 30 × 42 |
Measuring a whole set this way takes an afternoon.
Blueprint Auditor reads the scale off the title block, measures areas and lengths off the sheet, and writes the quantities out as a workbook whose totals are formulas. The trial takes a card, and runs on your own drawings.