How to compare supplement prices per gram
A worked USD price comparison using ingredient amount, servings per container and a consistent checkout price.
A $20 bottle is not necessarily less expensive than a $30 bottle. The useful comparison is how much of the same declared ingredient each container supplies. Start with three numbers: the container price in USD, label servings per container, and the ingredient amount per label serving.
Work through one example
These are hypothetical prices and labels, not current merchant offers. Product A costs $24 and contains 60 servings, each declaring 200 mg of the ingredient. Its container holds 60 × 200 ÷ 1,000 = 12 grams. That works out to $2.00 per gram and $0.40 per serving.
Product B costs $30 and contains 90 servings, each declaring 250 mg of the same ingredient and form. Its total is 22.5 grams: $1.33 per gram and about $0.33 per serving. B has a higher bottle price but a lower ingredient cost in this example.
| Example | USD/container | Total ingredient | USD/g |
|---|---|---|---|
| A | $24 | 12 g | $2.00 |
| B | $30 | 22.5 g | $1.33 |
Choose the denominator first
The bottle's net weight includes material that may not be the ingredient you are comparing. Use the declared amount for the selected ingredient. In a multi-ingredient product, a cost-per-gram result assigns the whole price to that selected ingredient for comparison; it does not calculate what the manufacturer paid for it or split the price across ingredients.
Make the checkout assumptions match
Either include shipping and tax for both products or exclude them for both. Do not compare a one-time purchase price with a subscription discount without noting the condition. Compare the same package variant and record when you checked the price.
A lower dollar-per-gram figure does not establish better quality, absorption or suitability. One gram is just the calculation unit, never a recommendation to consume that amount. If an amount or serving count is missing, leave the result unknown.
Calculate two products side by side →
Source and editorial scope
NIH ODS: reading a supplement label ↗ · Consulted September 26, 2026. Examples and cost arithmetic are illustrative calculations by Form & Fact. Source attribution does not imply endorsement. No clinical review or product testing is claimed.
These guides explain labels and comparison arithmetic. They do not recommend an intake or establish a product's safety, efficacy or quality. Sources and methodology.