Compare calculators

Both calculators run independently — change the inputs on either side to compare results.

Coin Flip Probability Calculator

Calculate the exact probability of getting a specific number of heads in a fixed number of fair coin flips. It applies the binomial formula, so it is ideal for statistics homework, game design, and making sense of random streaks.

Number of Flips (flips)

Number of Heads (heads)

Fill in the required fields to see your result.

Probability

Combinations and Permutations Calculator

Calculate combinations (nCr) and permutations (nPr), with or without replacement, for counting and probability problems. Use it for lottery odds, team selection, and combinatorics assignments.

Total Items (n) (items)

Items Selected (r) (items)

Calculation Type

With Replacement

Fill in the required fields to see your result.

Key differences

	Coin Flip Probability Calculator	Combinations and Permutations Calculator
Category	Probability	Probability
Inputs required	2	4
Result	Probability	Result (ways)
What it does	Calculate the exact probability of getting a specific number of heads in a fixed number of fair coin flips. It applies the binomial formula, so it is ideal for statistics homework, game design, and making sense of random streaks.	Calculate combinations (nCr) and permutations (nPr), with or without replacement, for counting and probability problems. Use it for lottery odds, team selection, and combinatorics assignments.