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Everyday Math Calculator
Everyday arithmetic, reviewed October 2026 — exact for the inputs typed, not a substitute for certified measurement or medical advice.
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n factorial (n!) multiplies all whole numbers from 1 to n and counts the ways to arrange n distinct items. Growth is explosive: 5! is 120, 10! is already 3,628,800, and 20! passes a quintillion. The page shows the digit count beside the value so the scale lands even when the number itself is unreadable.
Enter a whole number from 0 to 170 — 0! is 1 by definition (one way to arrange nothing). Use it for permutations (seating orders, PIN strength estimates) and basic combinatorics. Input stops at 170 because 171! overflows double-precision floats; beyond that the mathematics needs logarithms or specialised libraries, not a browser tab.
It does not compute combinations or permutations with repetition directly, extend to non-integers via the gamma function, or exceed 170 — divide factorials yourself (nCr = n! ÷ r! ÷ (n−r)!) for choose-problems.
n capped at 170 to avoid freezing the tab.
1, by definition — there is exactly one way to arrange an empty set.
171! overflows the double-precision floating-point range used in the browser, so results above 170 are not reliable.
Run the three factorials separately and divide: nCr = n! ÷ (r! × (n−r)!). For 5 choose 2, that is 120 ÷ (2 × 6) = 10.
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