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SI units and prefixes (BIPM SI Reference Point)

The 7 SI base units, 22 named SI derived units, and 24 SI prefixes from the BIPM SI Reference Point (the authoritative digital reference of the SI Digital Framework, CC BY 3.0 IGO). One document per unit or prefix: base units carry the current definition with its defining constant and superseded definitions, derived units the expression in base and other SI units, and prefixes the exponent and scaling factor.

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Documents

Showing 49–53 of 53 documents

DocumentVersion

weber (Wb)

The weber (symbol Wb) is a named SI derived unit of magnetic flux, per the BIPM SI Reference Point.

v1

yocto (y)

yocto (symbol y) is the SI prefix for a factor of 10⁻²⁴ (scaling factor 0.000000000000000000000001), per the BIPM SI Reference Point.

v1

yotta (Y)

yotta (symbol Y) is the SI prefix for a factor of 10²⁴ (scaling factor 1000000000000000000000000), per the BIPM SI Reference Point.

v1

zepto (z)

zepto (symbol z) is the SI prefix for a factor of 10⁻²¹ (scaling factor 0.000000000000000000001), per the BIPM SI Reference Point.

v1

zetta (Z)

zetta (symbol Z) is the SI prefix for a factor of 10²¹ (scaling factor 1000000000000000000000), per the BIPM SI Reference Point.

v1

Source, review, and usage
Published on Koskamo by
Koskamo
Version
54
Documents
53 documents
Reviewed
2026-10-05
Last approved change
2026-10-05
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0 in the last 90 days
Reuse
BIPM SI Reference Point (si-digital-framework.org), the SI defining constants, base and derived units, and prefixes; CC BY 3.0 IGO
Review status
Published by Koskamo; proposed revisions require Koskamo approval

Original sources are linked on each document. Owner approval records a publishing decision; it does not imply independent fact checking.

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Change history

Every change that reached this dataset. Proposals from contributors land only after Koskamo approves them.

  1. Published by Koskamo

    quecto (q) · v1

  2. Published by Koskamo

    ronto (r) · v1

  3. Published by Koskamo

    yocto (y) · v1

  4. Published by Koskamo

    zepto (z) · v1

  5. Published by Koskamo

    atto (a) · v1

  6. Published by Koskamo

    femto (f) · v1

  7. Published by Koskamo

    pico (p) · v1

  8. Published by Koskamo

    nano (n) · v1

  9. Published by Koskamo

    micro (μ) · v1

  10. Published by Koskamo

    milli (m) · v1