MetraNestChoose the reference dimension
Enter the original width and height in centimetres. To reach a specific width, use target-width mode; the height is then calculated automatically. The tool does not crop the image or try to fill another rectangle.
Read the percentage correctly
A setting of 150% means a final dimension 1.5 times the original, an increase of 50%. A setting of 50% halves both sides. The area is then divided by four.
Prepare a print
The calculated dimensions describe the physical size. They guarantee neither the file resolution nor that it fits on the sheet. Check margins, paper and the software’s scaling options before printing a test copy.
Factor = percentage ÷ 100, or target width ÷ original width. Each dimension is multiplied by this factor; the area is multiplied by its square.
Enlarging a 21 × 29.7 cm format
At 150%, the factor is 1.5. The width becomes 21 × 1.5 = 31.5 cm and the height 29.7 × 1.5 = 44.55 cm. The area is multiplied by 2.25; the number of pixels in the file does not change.
Details to check
- Use the same unit for both original dimensions.
- Check that the selected mode matches the field you filled in.
- Check the printed size before making multiple copies.
Frequently asked questions
Why does the area not follow the same percentage?
Both width and height change. Doubling each side therefore multiplies the area by four, while reducing each side to 50% leaves one quarter of the area.
Does this tool make a photo sharper?
No. It calculates dimensions. Enlarging an existing image does not add detail; also use the photo resolution calculator to relate pixels to print size.
A method you can check · Content review :
Each tool shows its formulas and assumptions. Worked examples let you repeat the calculation and understand how rounding works.