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Count how many groups can be formed when order does not matter.

Count how many ordered arrangements are possible when selecting r items from n items.

Calculate DTI percentage for mortgage prep, loan screening, and budgeting scenarios.

Work out an affordable rent target from gross monthly income and your preferred rent percentage.

Calculate right-triangle hypotenuse length for geometry, construction checks, classroom work, and layout planning.

Estimate fuel used and trip cost for commuting, road trips, delivery routes, and driving budget checks.

Calculate the GCD, LCM, and simplified ratio for multiple integers.

Calculate pace and speed from distance and time for running, walking, and race planning.

Estimate future savings growth with compound interest, monthly deposits, and a selected time period.

Estimate simple interest, total interest, and the final amount using principal, annual rate, and years.