How Big is a Number?
Type an exponent in the field below or drag the slider. We instantly calculate its name in both the Short Scale and Long Scale, match the SI metric prefix, and pull a real-world fact from a 31-tier scale-of-the-universe database.
Set Exponent (Zeros)
10NSlider covers 0-3,003 zeros. Type up to 10,000,000 in the field for extreme values.
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Scale of the Universe
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Math Notation:
1 × 10100
Common Name
Ten Duotrigintillion
Used in American English, modern British English, Australia, and Canada. Each named step is a thousand times larger than the last.
Common Name
Ten thousand Trillion
Used in Continental Europe, South America, and historically in the UK. Adds "-illiard" steps (e.g. Milliard for 109).
Visual Number Sandbox
Numbers larger than 300 zeros are truncated with markers to keep your browser fast. "Copy Number" copies exact digits up to 10,000 zeros, then an honest 1e<N> form.
How Large Numbers Are Constructed (Conway-Wechsler System)
1. Grouping by Three
In the short scale, names increment every three zeros (103). A named value is 103n+3, where n is the systematic index: n=1 is Million, n=2 is Billion, and n=100 is Centillion.
2. Systematic Latin Roots
Rather than inventing words, the Conway-Wechsler system builds each index n from Latin parts: units (un, duo, tre…), tens (deci, viginti, triginta…), and hundreds (centi, ducenti, trecenti…).
3. Combining Rules
When joining units to tens or hundreds, linking letters (s, x, m, n) are inserted by classical phonology rules for pronounceable Latin (for example, tresvigintillion).