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Calculator guides

Guides explaining calculations, formulas, and common financial tasks.

Available guides

18 guides

Calculate mean plus basic count/sum statistics from a list of numbers.

Calculate break-even units/revenue from fixed cost, variable cost, and selling price.

Calculate compound growth from user-supplied principal, rate, frequency, and time with a clear informational disclaimer.

Calculate elapsed days and calendar differences between two dates.

Calculate discount amount and final price.

Calculate a weighted GPA from user-entered courses while clearly stating that grading systems vary.

Calculate weighted course grades from user-entered categories and weights.

Calculate estimated payment, total paid, and interest from principal, rate, and term with a clear informational disclaimer.

Calculate markup percentage, cost, price, and profit.

Calculate percentage increase/decrease between two values.

Handle common percentage calculations with clear formulas and results.

Calculate profit, margin, and related values from cost and revenue.

Calculate tax amount and total from a user-entered tax rate without assuming a jurisdiction.

Calculate simple interest and final amount.

Calculate durations between times and add/subtract durations.

Calculate tip and total with optional bill splitting.

Compare price per unit across products or package sizes.

Calculate age/duration between dates with clear date assumptions.