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A PDF can have several page boxes. This example has a 216 by 303 mm whole page.

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Its MediaBox and CropBox are identical. The visible page includes the bleed.

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The finished A4 TrimBox is 210 by 297 mm, inset 3 mm from every edge.

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Add both edges: 210 plus 3 plus 3 is 216. 297 plus 3 plus 3 is 303.

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Fit this whole page onto a full A4 sheet: the limiting ratio is 210 divided by 216, or 97.22 percent.

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The A4 trim then shrinks to 204.17 by 288.75 mm. A printer's usable area may make it smaller still.

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Actual size, or 100 percent, preserves the original 210 by 297 mm trim.

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Use stock that can hold the page. Measure a 100 mm gauge. These are authored dimensions, not a printer test.