How to use Permutation & Combination Calculator at our Percentage Calculator Hub
- Enter n. Type the total number of items you're choosing from. This is the bigger number in P(n,r) and C(n,r).
- Enter r. Type how many items you want to pick or arrange. Just make sure r is less than or equal to n, otherwise the math breaks.
- Hit calculate. Click the button and the tool spits out both the permutation and combination values in one shot — no need to run two separate calculators.
- Compare the results. Permutations will always be bigger or equal to combinations because order matters. Use this as a sanity check before writing your answer down.
- Pick the one your question wants. If the problem says 'arrange', 'order', or 'line up', use P(n,r). If it says 'choose', 'select', or 'group', use C(n,r).
- Show your work. Copy the formula expansion into your homework so your teacher sees you understood the steps, not just the final number.