A3

Paper size

297 x 420 mm

The international paper size standard, ISO 216, is based on the German DIN 476 standard for paper sizes. Using the metric system, the base format is a sheet of paper measuring 1 m² in area (A0 paper size). Successive paper sizes in the series A1, A2, A3, etc., are defined by halving the preceding paper size parallel to its shorter side. The most frequently used paper size is A4 (210 × 297 mm).

International paper size: A

International paper size: B

  • 4B
    ×0.02
  • 2B
    ×0.04
  • B0
    ×0.09
  • B1
    ×0.18
  • B2
    ×0.35
  • B3
    ×0.71
  • B4
    ×1.41
  • B5
    ×2.84
  • B6
    ×5.67
  • B7
    ×11.34
  • B8
    ×22.86
  • B9
    ×45.73
  • B10
    ×91.45

International paper size: C

North American paper sizes

Japanese paper sizes

Inch based paper sizes

Metric

  • Kilometre (km)
    2.97×10⁻⁴ x 4.2×10⁻⁴
  • Metre (m)
    0.3 x 0.42
  • Decimetre (dm)
    2.97 x 4.2
  • Centimetre (cm)
    29.7 x 42
  • Millimetre (mm)
    297 x 420
  • Micrometre (µm)
    297,000 x 420,000
  • Nanometre (nm)
    297,000,000 x 420,000,000
  • Angstrom (Å)
    2.97×10⁹ x 4.2×10⁹

British/American

  • League
    6.15×10⁻⁵ x 8.7×10⁻⁵
  • Mile (mi)
    1.85×10⁻⁴ x 2.61×10⁻⁴
  • Furlong
    1.48×10⁻³ x 2.09×10⁻³
  • Chain
    0.01 x 0.02
  • Rod (rd)
    0.06 x 0.08
  • Yard (yd)
    0.32 x 0.46
  • Foot (ft)
    0.97 x 1.38
  • Link
    1.48 x 2.09
  • Hand
    2.92 x 4.13
  • Inch (in)
    11.69 x 16.54
  • Line
    116.93 x 165.35
  • Mil (mil)
    11,692.91 x 16,535.43
  • Thou (thou)
    11,692.91 x 16,535.43

Nautical

  • Nautical mile
    1.6×10⁻⁴ x 2.27×10⁻⁴
  • Fathom
    0.16 x 0.23

Astronomical

  • Parsec (pc)
    9.63×10⁻¹⁸ x 1.36×10⁻¹⁷
  • Light year
    3.14×10⁻¹⁷ x 4.44×10⁻¹⁷
  • Astronomical unit (AE)
    1.99×10⁻¹² x 2.81×10⁻¹²
  • Light minute
    1.65×10⁻¹¹ x 2.33×10⁻¹¹
  • Light second
    9.91×10⁻¹⁰ x 1.4×10⁻⁹