Measure the artwork itself
Large-format sheets are trimmed close to their label, but at this scale even a few millimetres of tolerance is easy to see. Measure the actual poster rather than trusting the tag.
The 70x100 cm answer
70x100 cm in inches and 28x40 frame fit
A 70 × 100 cm poster measures about 27.56 × 39.37 inches. It is not the same nominal size as a 28 × 40 inch frame or a B1 sheet — here is how the labels differ and what to measure before framing a piece this large.
The direct answer
70x100 cm in inches
Centimeters convert to inches by dividing by 2.54. The result does not land on a round number, so the two-decimal answer is written as an approximation.
1 in = 2.54 cm70 × 100 cm ≈ 27.56 × 39.37 in
70 ÷ 2.54 = 27.559... and 100 ÷ 2.54 = 39.370..., rounded to 27.56 and 39.37 inches.
Frame comparison
Is 70x100 cm the same as 28x40 inches?
No. Both labels describe the same 7:10 shape, so the frame and the sheet match in proportion and differ only in scale — but the nominal sizes are not equal.
28 × 40 in71.12 × 101.60 cm
| Object | Width | Height | In inches |
|---|---|---|---|
| 70 × 100 cm sheet | 70 cm | 100 cm | ≈ 27.56 × 39.37 in |
| 28 × 40 in frame label | 71.12 cm | 101.60 cm | 28 × 40 in |
| Nominal difference (frame − sheet) | +1.12 cm | +1.60 cm | — |
| Half of the difference, centred | +0.56 cm per side | +0.80 cm per side | — |
Related labels
70x100 cm, B1, and 50x70 cm
Two other labels come up next to this size, and neither is a synonym for it.
| Object | Width | Height | Relation to 70 × 100 cm |
|---|---|---|---|
| 70 × 100 cm sheet | 70.0 cm | 100.0 cm | — |
| B1 poster (ISO 216) | 70.7 cm | 100.0 cm | 0.7 cm wider, same height |
| 50 × 70 cm sheet | 50.0 cm | 70.0 cm | Half the area, different 5:7 shape |
ISO 216 defines B1 as 707 × 1000 mm (see a reference table of ISO 216 paper sizes), so a B1 poster runs 0.7 cm wider than a 70 × 100 cm print at the same height. And because 70 × 100 cm has twice the area of 50 × 70 cm (7,000 versus 3,500 cm²) with a different 7:10 proportion, a 50 × 70 cm frame or print cannot stand in for this size.
Before ordering
What to check before framing a 70x100 cm piece
Sheets this large are display pieces — exhibition prints, oversized posters, statement art — and the nominal gap to a 28 × 40 in frame is wider than with smaller metric prints. Work through these checks with the actual items in hand.
Check both frame measurements
Measure the inside seat that holds the sheet and the visible window inside the frame lip. The seat determines whether the poster fits; the lip determines how much of it remains visible.
Decide how the gap is handled
Nominally a 28 × 40 in frame leaves about 0.56 cm on each side and 0.80 cm top and bottom around a centred 70 × 100 cm sheet. A mat can absorb that gap; other fixing methods can too.
Confirm backing and fixing
Sheets this size need a backing and fixing method that keeps them flat and secure. Check the backing board, clips, or points the frame uses — what matters is the measured opening and grip, not the label alone.
70x100 answers
70x100 cm in inches FAQ
What is 70x100 cm in inches?
70 × 100 cm is about 27.56 × 39.37 inches. The conversion divides each side by 2.54: 70 cm becomes 27.56 in and 100 cm becomes 39.37 in, rounded to two decimals.
Is a 70x100 cm poster the same as a 28x40 in frame?
No. A 28 × 40 in frame label converts to exactly 71.12 × 101.60 cm, which is 1.12 cm wider and 1.60 cm higher than a 70 × 100 cm sheet. Both share the same 7:10 shape; centred, the nominal gap is about 0.56 cm per side and 0.80 cm top and bottom.
Is 70x100 cm the same as B1?
Not exactly. ISO 216 defines B1 as 707 × 1000 mm, which is 0.7 cm wider than a 70 × 100 cm sheet at the same height. Posters sold as B1 and frames sold as 70 × 100 cm are close but separate sizes, so check which standard a product actually uses.
How does 70x100 cm compare with 50x70 cm?
A 70 × 100 cm sheet has twice the area of a 50 × 70 cm sheet — 7,000 versus 3,500 cm² — and the proportions differ: 7:10 versus 5:7. They are separate standard sizes, not the same size written two ways.