Practical formulae for daily life: shopping, cooking, travel, and home projects.
Price per single unit to compare value between products.
Price after a percentage discount.
Final price including sales tax.
Gratuity based on a bill amount.
Distance traveled per gallon of fuel.
Total fuel cost for a trip.
Distance covered per unit time.
Time needed to cover a distance at a given speed.
Adjust ingredient quantities for a different number of servings.
Amount of paint required for a wall area.
Number of tiles to cover a floor.
Floor area of a rectangular room.
Interest earned or owed without compounding.
Convert temperature from Celsius to Fahrenheit.
Weight-to-height ratio used as a health screening tool.
Relative change between two values.
Per-person share of a bill including tip.
Fixed monthly payment for an amortizing loan.
Approximate body-mass loss from a calorie deficit (kg).
Find a height that preserves an aspect ratio.