Cost Calculator

Grocery stores, warehouse clubs, and online retailers package the same product in many different sizes. Comparing headline prices alone almost always misleads shoppers.

Dividing total price by quantity gives a true per-unit figure so you can tell at a glance whether the family-sized package really is cheaper or just bigger.

This calculator lets you compare two items side by side and highlights which one is cheaper per unit, along with the savings you would realize by choosing it.

Online purchases often look cheap until tax and shipping are added at checkout. Enter your unit price, the quantity you plan to order, the local sales tax rate, and the flat shipping fee, and the calculator will show a clean breakdown of subtotal, tax, shipping, and grand total.

This is especially useful for:

• budgeting bulk orders
• office supply runs
• small-business purchasing

Resellers routinely mark up wholesale items to produce a sell price, and shoppers routinely look for marked-down final prices on sale items.

Markup mode takes a cost plus a markup percentage and returns the sell price and the added dollar amount.

Markdown mode takes a list price and a discount percentage and returns the sale price and the dollars saved.

A cost calculator applies simple arithmetic ratios and percentages to turn raw numbers into decisions:

• Unit price divides total cost by quantity, so a $12 bag holding 500 grams works out to $0.024 per gram.
• Total cost multiplies unit price by quantity, adds sales tax on that subtotal, then adds a flat shipping fee.
• Markup inflates a wholesale cost by a percentage to set a sell price.
• Markdown subtracts a discount from a list price.

The U.S. Federal Trade Commission encourages shoppers to compare per-unit prices precisely because package sizes rarely align cleanly. Because every operation is deterministic arithmetic, results are exact and reproducible with no estimation involved.

Markup and margin describe the same profit from two different bases, so confusing them can quietly erode earnings.

Markup is profit expressed as a percentage of cost: a $10 item sold for $15 carries a 50% markup because the $5 profit equals half the cost.

Margin is that same $5 profit expressed as a percentage of the $15 selling price, which is 33.3%.

As Investopedia notes, retailers who set prices by margin but think in markup terms routinely underprice. This calculator computes markup on cost, so if you target a specific margin, convert first: margin divided by (1 minus margin) equals the required markup.

To compare package sizes fairly, reduce each option to a single per-unit price before deciding. Divide the total price by the quantity in a consistent unit, whether ounces, grams, sheets, or fluid ounces, then pick the lower figure.

The FTC's consumer guidance highlights unit pricing as the fastest way to see through deceptive package proportioning, and many jurisdictions require shelf labels for this reason.

Watch for mismatched units, such as a jar labeled in ounces beside one labeled in grams, and convert both to the same unit first. This calculator handles two items at once and flags the cheaper per-unit option plus your savings.

A cost calculator earns its keep across everyday and professional settings:

• Grocery shoppers use unit price mode to choose between bulk and single packs, while warehouse-club members verify that membership-sized quantities truly cost less per unit.
• Small-business owners set consistent retail prices with markup mode and check clearance figures with markdown mode.
• Freelancers and project managers estimate total spend, including tax and shipping, when quoting materials.
• Home cooks scale ingredient costs, hobbyists price handmade goods for craft fairs, and resellers confirm margins before listing on marketplaces.

Because it runs entirely in your browser with no login, it fits quick decisions at the shelf, the desk, or the checkout page.

Tax and shipping can add a meaningful amount to a purchase that looks cheap on the product page.

In this calculator, sales tax applies only to the subtotal (unit price times quantity), and the flat shipping fee is added afterward, which reflects the common default in the United States.

However, tax treatment of shipping varies widely by state and country, so verify your local rule. Some jurisdictions tax combined shipping-and-handling charges while others exempt separately stated delivery fees.

If your shipping scales with order size rather than staying flat, fold it into the unit price before taxing so the total stays accurate for larger orders.

Finding a sale price is a single subtraction of a percentage from the original price. Multiply the list price by one minus the discount rate: a $50 item at 25% off becomes $50 times 0.75, or $37.50, saving $12.50.

Markdown mode does this instantly and reports both the final price and the dollars saved.

Beware stacked discounts, because taking 20% off and then another 10% off is not a 30% discount; it equals a 28% total reduction, since the second cut applies to the already reduced price. For coupons that stack, apply each percentage in sequence rather than adding them together.

• The most frequent error is confusing markup with margin, which leads to systematically underpriced products, as pricing references like Investopedia repeatedly warn.
• A second mistake is comparing unit prices in mismatched units, such as pitting a per-ounce figure against a per-gram figure without converting.
• Shoppers also forget to add tax and shipping, so a low sticker price hides a higher checkout total.
• Others incorrectly add stacked discount percentages instead of applying them in sequence.
• Finally, treating a flat shipping fee as taxable, or assuming it scales with quantity, distorts bulk-order estimates.

Slowing down to confirm units, bases, and tax rules prevents nearly all of these costly slips.

Unit pricing turns confusing shelf labels into a fair, apples-to-apples comparison, which is why consumer protection bodies promote it. The U.S. Federal Trade Commission and many state weights-and-measures programs support unit-price disclosure precisely because identical goods appear in countless package sizes designed to blur value.

A larger box is not automatically cheaper per unit, and premium branding can mask a higher per-ounce cost. By reducing every option to a single per-unit number, you sidestep marketing framing and buy on genuine value.

Over a full grocery run or a bulk business order, consistently choosing the lower unit price compounds into real savings without sacrificing quality or quantity.