Everyday calculators

Percentages, dates, units, and the small sums that come up all the time.

• Age calculatorEnter a date of birth to get an exact age today, or on any date you …
• Concrete volume calculatorEnter the slab or footing size to get the concrete in cubic yards and the number …
• Date difference calculatorEnter two dates to get the number of days between them, the same span in weeks, …
• Discount calculatorEnter the original price and the discount to see the sale price and what you save. …
• Fuel cost calculatorEnter the distance, your car's mpg and the local gas price to see what the drive …
• Paint coverage calculatorEnter the total length of the walls and their height to see how many gallons a …
• Percentage calculatorPick the question, enter X and Y, and read the answer with the formula used.
• Recipe scaling calculatorEnter what the recipe makes and what you need, then each ingredient amount, to get the …
• Sales tax calculatorEnter a price and pick a state to see the tax and total. Switch the mode …
• Unit converterEnter a value and pick the units. Length, weight, kitchen volumes and temperature, using the exact …