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Price Per Gram Calculator

Compare packages labeled in grams, kilograms, ounces, or pounds. See cost per gram and per 100g, then copy or share your calculation.

Live calculator

Price per gram

Use net weight, not fluid ounces (fl oz).

Cost per gram$0.0235

$7.99 divided by 340 g.

Cost per 100g$2.35

A larger equivalent that is easier to compare at a glance.

Package size340 g

Use the net weight from the package label.

How this unit price is foundper g
Package
$7.99340 g
Cost per g$0.0235

Package weight is converted to grams before dividing.

Shopping results are planning estimates. Check package size, usable quantity, taxes, coupons, shipping, and subscription terms before choosing the better buy.

Formula

Price per gram formula

Price per gram = package price / package grams

Package weights are converted to grams first. The calculator also shows price per 100g for an easier comparison.

How to use

Steps

  1. Choose Find unit cost for one package, or Compare packages for two.
  2. Enter the package price and weight, then choose grams, kilograms, ounces, or pounds.
  3. If comparing, enter the second package's price, weight, and unit; the units may differ.
  4. Use the lower unit price when product quality and usable amount match.
  5. Copy the result or copy a link to reopen the calculation. A shared link includes the visible inputs.

Example

Sample calculation

First package$7.99 / 340g
Second package$11.99 / 500g
Price per 100gAbout $2.35 vs $2.40

Calculator use

Best for

  • Comparing metric package labels for imported foods, coffee, tea, supplements, spices, snacks, and specialty ingredients.
  • Reading tiny per-gram prices as a clearer price per 100 grams before choosing between packages.
  • Checking whether a larger metric package is actually cheaper than a smaller one.
  • Comparing price book entries when ounces would add an unnecessary conversion step.

Before relying on it

Check first

  • Selecting the wrong weight unit for a package label; the calculator converts the selected units automatically.
  • Treating a lower per-gram price as better when freshness, concentration, serving size, or quality differs.
  • Using total package weight when only part of the product is edible or usable.
  • Buying a larger package that will expire or lose quality before it is used.

Details

What to know before using the result

Mixed package labelsCompare grams, kilograms, ounces, or pounds

Each package has its own unit selector. Weight ounces use the avoirdupois measure, not fluid ounces.

Price per 100gReadable comparison

Per-gram prices can look tiny, so the calculator also multiplies by 100.

Net amountUse edible or usable grams

Liquid, brine, shells, or packaging can change how much product you actually use.

Source notes

References used for this calculator

National Institute of Standards and TechnologyUnit pricing guidance supports comparing products by a uniform unit of measure.

Benchmarks

How to read the result

Per gram: Exact unit.

Best for small, expensive items where pennies per gram matter.

Per 100g: Easier to read.

Good for food, coffee, supplements, and specialty items.

Bulk packages: Check use.

A lower price per gram only helps if you can store and use the full amount.

Calculator accuracy

Methodology and assumptions

Formula, inputs, limitations and review record
Formula

Price per gram = package price / package grams

Inputs used

Package price, Package weight and unit, Optional comparison package

Limitations

Shopping calculators compare visible price assumptions, but real value can change with quality, spoilage, package size, rewards, taxes, shipping, and recurring charges.

Review record

Catalog QA baseline on June 6, 2026. This date marks the catalog-wide automated and editorial QA baseline, not a tool-specific expert review.

Cite this page

Toolkit Shelf. Price Per Gram Calculator. https://toolkitshelf.com/tools/price-per-gram-calculator

FAQ

Common questions

How do I calculate price per gram?

Divide the package price by the number of grams in the package.

How do I calculate price per 100 grams?

Divide price by grams, then multiply the result by 100.

When should I use price per gram?

Use it when products are labeled in grams or when comparing small quantities of higher-cost goods.

What should I check before choosing the cheaper option?

Check net quantity, usable amount, coupons, taxes, spoilage, storage space, quality, and whether the products are truly comparable.

Why can the package label change the result?

Package labels can use ounces, pounds, grams, servings, sheets, loads, or pieces. Convert to the same practical unit before comparing prices.