# Peptide Blend Calculator

In a blend vial every component dissolves in the same liquid, so one volume holds all of them in fixed proportions. Enter each component and the liquid added to see each one’s concentration and how much of each is in the volume you measure.

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

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

## How blend math differs from a single vial

A single-peptide vial has one concentration. A blend has one per component, but only one volume: whatever you measure carries every component at once. So you choose which number to work from:

- **One component:** the volume that holds a target amount of one component, and what the others come to in that same volume.
- **Combined total:** the volume that holds a combined amount of all components that share a unit.
- **A volume:** what each component amounts to in a volume you measured.

`component per mL = component amount ÷ liquid added`

`component in a volume = volume × component amount ÷ liquid added`

## Worked example: an uneven 10 mg + 5 mg blend

A vial holds 10 mg of component A and 5 mg of component B, and you add 3 mL.

|  | Component A | Component B | Combined |
| --- | --- | --- | --- |
| Per mL | 3.333 mg | 1.667 mg | 5 mg |
| Share of the vial | 66.7% | 33.3% | 100% |
| In 20 units (0.2 mL) | 666.7 mcg | 333.3 mcg | 1,000 mcg |

Because the ratio is fixed by the vial, you can’t get more of A without more of B in the same volume. The calculator makes that visible for any number of components (up to eight).

## Components in different units

Components in mg and mcg add up exactly. A component labelled in IU can’t be added to mass components without its IU factor, so the calculator leaves it out of combined totals and shares and says so, instead of guessing.

## Frequently asked questions

### How do I work out each peptide in a blend?

Divide each component’s amount by the liquid added to get its concentration. Any volume then holds volume × concentration of each one. The calculator does this for every component at once.

### What if the blend ratio is uneven?

That’s fine: each component is calculated from its own amount. A 10 mg + 5 mg blend in 3 mL holds twice as much A as B in every volume.

### How much bacteriostatic water should I add to a blend?

The same reasoning as a single vial: the amounts don’t change, only the volume per amount. Choose a volume that puts the amount you work from on a readable syringe marking. The [blend math guide](https://bestpeptidecalculator.app/guides/peptide-blend-math) has examples.

### Can I combine two separate vials into one?

Then you have a new solution: add the amounts and the volumes, and calculate it as a blend. Mixing compounds is a decision for your own research protocol; the calculator only does the arithmetic.

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