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Prefix ladder

Interactive prefix ladder through the entire SI scale: see how the decimal point moves – from yotta to yocto.

The prefix ladder shows how the decimal point moves when you change prefix – one single staircase through the entire SI scale, from yotta (10²⁴) down to yocto (10⁻²⁴). The school core, kilo to milli, is the middle of the stairs, and the national-exam set tera–pico sits around it. Pick a From step and a To step to see the move.

Pick a From step and a To step to see how the decimal point moves.

  1. yotta (Y)10²⁴ 1 YB = 1 000 ZB
  2. zetta (Z)10²¹ 1 ZB = 1 000 EB
  3. exa (E)10¹⁸ 1 EB = 1 000 PB
  4. peta (P)10¹⁵ 1 PB = 1 000 TB
  5. tera (T)10¹² 1 TB = 1 000 GB
  6. giga (G)10⁹ 1 GB = 1 000 MB
  7. mega (M)10⁶ 1 MJ = 1 000 000 J
  8. kilo (k)10³ 1 km = 1 000 m
  9. hecto (h)10² 1 hl = 100 l
  10. deca (da)10¹ 1 dag = 10 g
  11. base unit10⁰ 1 m, 1 g, 1 l
  12. deci (d)10⁻¹ 1 dl = 0.1 l
  13. centi (c)10⁻² 1 cm = 0.01 m
  14. milli (m)10⁻³ 1 mm = 0.001 m
  15. micro (µ)10⁻⁶ 1 µm = 0.000 001 m
  16. nano (n)10⁻⁹ 1 nm = 0.000 000 001 m
  17. pico (p)10⁻¹² 1 ps = 0.000 000 000 001 s
  18. femto (f)10⁻¹⁵ 1 fs = 0.001 ps
  19. atto (a)10⁻¹⁸ 1 as = 0.001 fs
  20. zepto (z)10⁻²¹ 1 zs = 0.001 as
  21. yocto (y)10⁻²⁴ 1 ys = 0.001 zs

Square and cubic units move 2 and 3 steps per prefix step - cm² to m² is not one step.

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Print: the button above prints the ladder on a single portrait A4 – no menus or buttons.