Free tools / Drawing
Print Scale and Sheet Resizer
Find the true scale of a drawing after it has been printed at a different sheet size.
Why this exists. Every architect prints A1 sheets at A3 and needs the resulting scale. There is clear, specific search demand for exactly this and almost nothing serving it properly.
Leave at zero to skip. Use it to check a real dimension.
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True scale after printing1:100Printed at 49.9% of original size, from A1 to A3.
- Original scale
- 1:50 (standard working scale)
- Linear reduction factor
- 0.4994
- Printed at
- 49.9% of original
- 1 mm on the print now equals
- 0.100 m in reality
| Printed at | Reduction | True scale |
|---|---|---|
| A0 (841 × 1189 mm) | 141.4% | 1:35 |
| A1 (594 × 841 mm) | 100.0% | 1:50 |
| A2 (420 × 594 mm) | 70.6% | 1:71 |
| A3 (297 × 420 mm) | 49.9% | 1:100 |
| A4 (210 × 297 mm) | 35.3% | 1:142 |
| ARCH D (24 × 36 in) | 102.6% | 1:49 |
| ARCH C (18 × 24 in) | 72.5% | 1:69 |
| ARCH B (12 × 18 in) | 51.3% | 1:97 |
| ANSI D (22 × 34 in) | 94.1% | 1:53 |
| ANSI B (11 × 17 in) | 47.0% | 1:106 |
How this is calculated
- The reduction factor is the smaller of the width and height ratios, which is how a print driver fits a drawing to a sheet without distorting it.
- Each step down the ISO A series halves the area, so the linear factor is one over the square root of two, about 0.7071. Two steps, such as A1 to A3, is therefore exactly half.
- This assumes the drawing was printed to fit the sheet. If it was printed at a fixed percentage instead, use that percentage directly.
This is a planning estimate, not professional advice. Read the full disclaimer.
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