Free Peptide Blend Calculator
Calculate exact draw volumes for multi-peptide vials and custom blends. Enter your blend ratios, reconstitution volume, and target compound to instantly see each peptide's individual dose and the total syringe volume — no math required.
Dosing tools
Peptide Blend Dosage Calculator
Calculate blended peptide doses with our visual syringe guide.
Volume of bacteriostatic water you add to reconstitute the powder. Use BAC water for preservation.
1 mL
2 mL
3 mL
5 mL
Custom
Blend Composition
Total: 45.0 mg
mg
mg
mg
The compound you want to dose by. Results will be calculated based on this compound.
The dose of the anchor compound you want per administration, in mcg or mg.
Conversion: 1,000 mcg = 1 mg
Results
Concentration
45.00
mg/mL
Doses per vial
40
Total blend to inject
1.13
mg
You'll get:
- BPC-157
- 250 mcgANCHOR
- TB-500
- 625 mcg
- KPV
- 250 mcg
1mL / 100 units
2 units
0.025 mL
Dosing Guidance
Recommended Schedule
Once daily
Supply Duration
This vial provides 40 doses (40-day supply at 250 mcg daily)
How the blend calculator works
Blended peptide vials contain two or more compounds in fixed ratios. Calculating your dose means working from one compound's target dose outward — determining the draw volume that delivers the right amount of every other compound in the same syringe.
Select a blend or build a custom mix
Choose from pre-loaded peptide blends with known compound ratios, or enter a custom combination. Each compound is listed with its proportion of the total vial content so you know exactly what you're working with before the calculation runs.
Set your reconstitution volume
Enter how much bacteriostatic water you added in milliliters. This sets the concentration of the entire blend — the same volume applies to all compounds proportionally, so their ratios stay constant regardless of how much water you use.
Choose an anchor compound and read your results
Select the compound you want to dose by. The calculator works backward from that target dose to determine the draw volume, then shows the resulting dose of every other compound delivered in the same injection.
What is a peptide blend?
A peptide blend is a single vial containing two or more peptides in a fixed ratio, reconstituted together in bacteriostatic water. Because the compounds share the same solution, every injection delivers a precise dose of each one simultaneously — no need to draw from multiple vials. Common blends pair peptides with complementary mechanisms to simplify a protocol into a single daily injection.
Back to dosage calculatorUnderstanding blend ratios
Unlike single-peptide vials, a blend delivers multiple compounds in every injection. The calculator accounts for the fixed ratio between compounds so each draw hits the right dose for all of them at once.
Fixed ratios
Pre-made blends have compound ratios set at manufacture. When you reconstitute a 5 mg BPC-157 / 5 mg TB-500 blend in 2 mL of water, every draw contains both peptides in a 1:1 ratio — you cannot separate them within the same vial.
The anchor compound
Because both compounds are drawn together, you dose the blend by targeting one — the anchor — and accepting whatever the other compounds deliver at that volume. Choose the compound with the tightest dosing requirements as your anchor.
Reconstitution volume and concentration
Adding more water lowers concentration across all compounds and increases draw volume. Adding less raises concentration and reduces draw volume. The ratio between compounds never changes — only the volume needed to hit your target dose.
Custom blends
The calculator also supports custom blends where you define each compound's amount. This is useful when you're combining separately reconstituted peptides in a single syringe and want to verify every dose before drawing.
One injection.Every dose, verified.
Enter your blend, reconstitution volume, and target compound — the calculator instantly shows the draw volume for the whole blend and the resulting dose for every peptide it contains. No spreadsheets, no manual ratio math. Supports pre-loaded blends and fully custom compound combinations.
Try the accumulation calculatorPeptide blend calculator stats
Instant
multi-compound results
Enter a blend and target dose — get the draw volume and individual compound doses in one calculation.
Custom
blend support
Build any combination of compounds with custom amounts, not just pre-loaded blends.
3
free calculators
Dosage, blend, and accumulation calculators — all free, no account required.
More peptide calculation tools
The blend calculator is one of three free tools. Use the standard dosage calculator to get the exact draw volume for a single-peptide vial, or use the accumulation calculator to model how peptide concentrations build in your system over a full dosing cycle.
Frequently asked questions
What is a peptide dosage calculator?
A peptide dosage calculator is a free tool that converts your vial size, bacteriostatic water volume, and target dose into an exact syringe draw volume. Instead of doing the reconstitution math by hand, you enter three inputs and instantly get the concentration of your solution and how many milliliters or syringeunits to draw. This calculator works for single peptide compounds and multi-peptide blends.
How do I calculate peptide dosage from a vial?
To calculate your peptide dose, divide the total peptide content of your vial in micrograms by the volume of bacteriostatic water you added in milliliters. This gives you your solution concentration in mcg/mL. Then divide your target dose by that concentration to get your draw volume. For example, a 5mg (5,000 mcg) vial reconstituted with 2mL of BAC water gives a concentration of 2,500 mcg/mL. A 250 mcg dose would require drawing 0.1mL. This calculator automates all of those steps instantly.
How much Bacteriostatic water should I add to a peptide vial?
Most people add 2mL to 3mL of bacteriostatic water per vial, but the right amount depends on the dose you want to draw and the syringe size you are using. Adding 1mL to a 5mg vial gives you a concentration of 5,000 mcg/mL, making each dose very small in volume. Adding 2mL gives you 2,500 mcg/mL, which is easier to measure on a standard insulin syringe. A general guideline is to choose a volume that puts your typical dose somewhere between 10 and 30 units on a U-100 syringe. Use the calculator above to test different water volumes and find what works for your dose.
How are peptides different from proteins?
Both are made of amino acids, but peptides are much smaller than proteins. Because of their tiny size, peptides can act like tiny messengers in the body, sending specific signals to your cells to tell them exactly what to do.