Calculate the number of ways to arrange k items from n items (nPr). Shows the step-by-step permutation calculation. Numbers never leave your device — every calculation runs locally in your browser.
Calculate the factorial of any number (n!). Handles large numbers and shows the full multiplication sequence. Numbers never leave your device — every calculation runs locally in your browser.
Check if any number is prime. Also shows all factors and whether the number is odd or even. Numbers never leave your device — every calculation runs locally in your browser.
Calculate the remainder of division (a mod b). Shows quotient, remainder, full division expression, and negative dividend semantics. Numbers never leave your device — every calculation runs locally in your browser.
Calculate Annual Recurring Revenue from subscription revenue, expansion revenue, and churn. Essential for SaaS businesses tracking growth. Numbers never leave your device — every calculation runs locally in your browser.
Calculate customer churn rate by dividing customers lost by total customers. Monitor retention health for your subscription business. Numbers never leave your device — every calculation runs locally in your browser.
A permutation counts the number of ways to arrange k items from n items where order matters. For example, arranging 3 books on a shelf from 5 options = P(5,3) = 60 permutations.
nPr = n! / (n-k)!. The calculator shows each step: the numerator (n factorial), denominator ((n-k) factorial), and the final division result.
Yes. The tool expands the factorial terms, shows the intermediate values, and demonstrates how the division produces the final count.
Permutations count arrangements where order matters (ABC ≠ BCA). Combinations count selections where order doesn't matter (ABC = BCA). Use the Combination Calculator for selections.
Yes. All calculations run in your browser. No data is transmitted.
Combination Calculator
Compute nCr combinations and nPr permutations with factorial steps shown. Count 5-card poker hands (2,598,960) correctly — free, local, no signup.
Factorial Calculator
Calculate the factorial of any number (n!). Handles large numbers and shows the full multiplication sequence. Numbers never leave your device — every calculation runs locally in your browser.
Last updated October 2026