# Peptide Cost Calculator

Enter what you paid, how many vials it bought and the amount in each. The calculator gives the cost per mg and per mcg, including shipping and tax if you add them, and the cost per portion when you enter an amount. Prices are only ever what you type.

Canonical: https://bestpeptidecalculator.app/peptide-cost-calculator
Last reviewed: 2026-11-08

Interactive calculator on the page: cost. It runs in the browser and never suggests an amount.

## How cost per mg is worked out

`total = price + shipping + tax`

`cost per mg = total ÷ (vials × mg per vial)`

Example: $45 for one 10 mg vial is $4.50 per mg, or $0.0045 per mcg. A 250 mcg portion is about $1.13.

Money is worked in whole cents with exact decimals, and shown with sub-cent precision where it matters ($0.0045 per mcg).

## Comparing offers fairly

- Compare cost per mg, not price per vial: vial sizes differ.
- Include shipping and tax. A cheaper vial with high shipping can cost more per mg.
- Only compare the same form (a vial with a vial, a capsule with a capsule). Different forms aren’t the same product.

Peptide Library’s [Shop](https://peptidelibrary.app/shop) compares listed prices per mg across vendors, per compound and form.

## Frequently asked questions

### How do I calculate the cost per mg?

Divide the total you paid (including shipping and tax) by the total mg you bought: vials × mg per vial.

### Does the calculator know prices?

No. It only uses the numbers you enter, and nothing you type is sent anywhere.

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Research and educational use only. Not medical advice. Best Peptide Calculator is powered by Peptide Library (https://peptidelibrary.app).