Permutations & Combinations
Enter n (total items) and r (chosen items) to see both formulas calculated.
Permutations (nPr)
720
Combinations (nCr)
120
You might also find these useful
Molar Mass CalculatorEnter a chemical formula like Ca(OH)2 to compute its molar mass and element breakdown.
Orbital MechanicsAdjust a satellite's altitude and see how its orbital speed and period change.
Golden RatioSee a rectangle divided again and again by the golden ratio, forming the classic spiral pattern.
Moment of InertiaCompare how a disk, ring, rod, or sphere resist rotation for the same mass and radius.