Free Stuff › Free Tools
Free savings calculators for everyday shopping
Professor Cheap’s tools help you compare prices, estimate what you will pay, and think through a purchase before checkout. Pick the calculator that answers your question.
Free to use. No signup required. Each tool has its own page, so you can bookmark it and return when you need it.
Discount & Sales Tax Calculator
Work out an estimated price after a percentage discount and sales tax before you head to checkout. This free calculator shows the discount amount and estimated total, using the tax rate you enter.
Open the calculator →Unit Price Comparison Calculator
Compare two grocery packages by price per ounce, pound, count or another matching unit. This free unit-price calculator helps you see past the package price when deciding which size offers better value.
Open the calculator →Cost Per Use Calculator
Estimate how much a purchase costs each time you use it. This free cost-per-use calculator can help you compare a frequently used item with one you might use only occasionally.
Open the calculator →Work Hours for a Purchase Calculator
Convert a purchase price into hours of take-home pay. This free work-hours calculator gives you another way to think about a purchase before deciding whether it is worth the money.
Open the calculator →Bulk Buying & Food Waste Calculator
Check whether a bulk package is still cheaper after allowing for the portion you may not use. This free bulk-buying calculator compares the cost per usable unit with a standard package.
Open the calculator →Small Habit Savings Calculator
See the estimated spending you could avoid by skipping a small purchase a few times a week. This free savings calculator shows monthly, yearly and five-year totals based on a steady weekly pattern.
Open the calculator →Which tool should I use?
Use the unit price calculator for different package sizes. Use the bulk buying calculator when some food may go unused. For a sale, start with discount and sales tax; for a purchase you will keep using, try cost per use.
Keep your favorite tools handy
Bookmark an individual calculator for quick access, or use all six together in Ima’s Savings Lab. Pair your calculations with the free grocery price tracker and weekly meal planner.
Need help deciding what to compare? Ask Professor Cheap, or browse all Free Stuff.