Peptide Calculator: Reconstitution Concentration and Volume Tool
The peptide calculator above turns three inputs into the four measurements you need when preparing a stock solution from a lyophilised vial. It is arithmetic for laboratory measurement only. It does not suggest amounts for people or animals, and every product we sell is for in-vitro research use.
What Each Calculator Result Means
- Concentration (mg/mL). The peptide in the vial divided by the diluent you added. This is the figure to write on the vial label.
- Amount in 0.1 mL. The micrograms of peptide held in one tenth of a millilitre of your stock. It is a quick way to sense-check a concentration before you start pipetting.
- Volume containing the target amount. How much of the stock solution holds the number of micrograms you entered, for transferring into an assay, master mix or further dilution.
- Same volume on a U-100 syringe scale. That volume expressed in the graduations printed on a U-100 syringe barrel, where 100 graduations equal 1 mL and each graduation is 0.01 mL. It is simply a volume scale, useful when a graduated syringe is the measuring tool on your bench.
Worked Example With the Default Values
A 10 mg vial made up with 2 mL of diluent gives 5 mg/mL, which is 5,000 mcg per mL. One tenth of a millilitre therefore holds 500 mcg. A target of 250 mcg sits in 0.05 mL, which reads as 5 graduations on a U-100 scale. Change any input and the four outputs update together.
Getting Accurate Peptide Concentration Readings
- For blend vials, enter the amount of the single component you are measuring, not the total vial weight.
- If the volume result is very small, under about 0.02 mL, add more diluent. Tiny volumes are hard to measure precisely with any syringe or pipette.
- The maths assumes the whole labelled amount dissolved. A cloudy or partly dissolved stock will be weaker than the calculator says.
- Results larger than 1 mL exceed a standard 1 mL barrel, so use a larger syringe or a more concentrated stock.
What Makes the Best Peptide Reconstitution Calculator?
The best peptide reconstitution calculator is the one that shows its working. This one is free, runs in the browser with no app to install, and prints the concentration, the amount per 0.1 mL, the volume and the U-100 reading side by side, so a typing error shows up as a number that looks wrong. Most best peptide calculator app lists compare interface features; what matters at the bench is that the formula is stated and the units are explicit.
We also keep compound-specific versions preset to our own vial fills: BPC-157, TB-500, the BPC-157 and TB-500 blend, CJC-1295 and ipamorelin, GHK-Cu, MOTS-C, PT-141, retatrutide and tesamorelin. For the 2 mg tirzepatide vial, which has no preset page, this general calculator does the same job: enter 2 mg and the water added. Pre-filled peptide pens need no calculator at all, because the concentration is fixed in the cartridge.
Calculating GLOW and KLOW Blends
There is no best dosage for GLOW or KLOW peptide that a calculator can give, and we do not suggest one. What it can do is split a blend vial into its parts: enter the total fill, then apply each component's share. In the 70 mg GLOW vial, GHK-Cu is 50 mg of the total, so it makes up five sevenths of every volume drawn. The blends themselves are compared on our peptide stacks page.
Best Syringe for Reconstituting Peptides
Two jobs, two syringes. To add diluent, a 1 mL syringe with a longer needle, such as our U-100 1 mL 29G 12.7 mm, reaches the bottom of a vial and moves 2 or 3 mL in a few draws. To measure small volumes from the stock, the smallest barrel that holds the volume is the most accurate: the 0.3 mL and 0.5 mL 31G insulin syringes are $3 each, or $20 for a 30 pack.
Using It as a Peptide Dosage Calculator for Lab Work
Many researchers look for a peptide dosage calculator when the real question is how much stock solution carries a set mass of peptide. In a laboratory, that mass is the amount delivered into a well, a culture flask or the first tube of a dilution series, and this tool works it out from the vial fill and the diluent volume. It never suggests what that amount should be. Your method or the published protocol you are replicating sets the target; the calculator only handles the unit conversions.
Very low working concentrations usually need an intermediate dilution. Say an assay calls for 10 mcg of peptide in 10 mL of medium, giving 1 mcg/mL. From a 5,000 mcg/mL stock that is 0.002 mL, far too small to pipette accurately. Dilute the stock 1 in 100 first, to 50 mcg/mL, and the same 10 mcg is then held in 0.2 mL, a volume any calibrated pipette handles with ease.
Most researchers use bacteriostatic water from our lab supplies as the diluent. For the full bench method, read how to reconstitute peptides. The fill you enter is only as reliable as the vial, which is why every lot is tested as described on our lab tested peptides page; the compounds themselves are listed on peptides for sale in Australia.
Shop the Peptides These Calculators Cover
A concentration is only useful with the right vial. Buy online from the peptide shop, where every fill in the preset list is in stock, add bacteriostatic water and U-100 syringes, and order from anywhere in Australia: no need to look for a peptide supplier near me.
Peptide Calculator Explained
The Formula Behind Every Peptide Calculator
Three relationships do all the work. Concentration equals the vial fill in milligrams divided by the water added in millilitres. The volume to draw equals the target amount divided by that concentration, after converting micrograms to milligrams. Syringe units equal that volume multiplied by 100, because a U-100 syringe has 100 marks per millilitre. Everything the calculator shows is one of these three steps.
Choosing How Much Bacteriostatic Water to Add
There is no single correct volume. Less water gives a stronger solution, so very small volumes carry large amounts and a one-unit misread matters more. More water spreads the peptide out, which makes small amounts easier to measure but uses more of the vial's space. Many labs choose a volume that turns their usual target into a round number of units, such as 2 mL in a 10 mg vial, where 500 mcg sits at exactly 10 units.
Reading a U-100 Insulin Syringe
- 1 mL syringe: 100 units, usually marked every 2 units.
- 0.5 mL syringe: 50 units, marked every unit, easier for small volumes.
- 0.3 mL syringe: 30 units, often with half-unit marks for the finest readings.
- Choose the smallest barrel that holds the full volume; our U-100 syringes come in all three sizes.
Calculating Blends Such as the Wolverine or KLOW Vials
For a blend, run the calculator on the total fill, then split the result by each component's share. The 10 mg BPC-157 and TB-500 blend holds 5 mg of each, so with 2 mL of water the solution is 5 mg/mL in total and 2.5 mg/mL of each peptide. Every component in a blend moves together; one cannot be measured without the others.
When Mass Is Not Enough: Molarity for Cell Work
Cell culture papers often report peptides in nanomolar or micromolar terms rather than micrograms. To convert, divide the concentration in grams per litre by the molecular weight in grams per mole. Because peptide masses vary from a few hundred daltons for GHK-Cu to nearly 5,000 for TB-500, equal masses of two peptides can differ more than tenfold in molar amount. The certificate in the COA library lists the measured molecular weight for each lot.
Checks Before Trusting a Result
- Confirm the fill printed on the vial label matches what was entered, including for multi-size products.
- Enter the diluent volume actually added, not the volume planned.
- Keep the target in micrograms and the fill in milligrams.
- Recalculate whenever a new vial or lot is opened, and write the concentration on the label as the reconstitution guide recommends.
Peptide Reconstitution Chart by Vial Size
Concentration (mg per mL) and the amount held in 0.1 mL, which is 10 units on a U-100 insulin syringe, for the most common fills and water volumes. Find the fill in the left column and read across to the volume of bacteriostatic water added.
| Vial fill | 1 mL water | 2 mL water | 3 mL water | 5 mL water |
|---|---|---|---|---|
| 2 mg | 2 mg/mL 200 mcg per 10 units | 1 mg/mL 100 mcg per 10 units | 0.667 mg/mL 66.7 mcg per 10 units | 0.4 mg/mL 40 mcg per 10 units |
| 5 mg | 5 mg/mL 500 mcg per 10 units | 2.5 mg/mL 250 mcg per 10 units | 1.667 mg/mL 166.7 mcg per 10 units | 1 mg/mL 100 mcg per 10 units |
| 10 mg | 10 mg/mL 1,000 mcg per 10 units | 5 mg/mL 500 mcg per 10 units | 3.333 mg/mL 333.3 mcg per 10 units | 2 mg/mL 200 mcg per 10 units |
| 20 mg | 20 mg/mL 2,000 mcg per 10 units | 10 mg/mL 1,000 mcg per 10 units | 6.667 mg/mL 666.7 mcg per 10 units | 4 mg/mL 400 mcg per 10 units |
| 50 mg | 50 mg/mL 5,000 mcg per 10 units | 25 mg/mL 2,500 mcg per 10 units | 16.667 mg/mL 1,666.7 mcg per 10 units | 10 mg/mL 1,000 mcg per 10 units |
Doubling the water halves the concentration, which makes small amounts easier to measure accurately but means more volume is needed for larger ones. For any other fill, use the calculator above.
Peptide Dosage Calculators by Compound
Frequently Asked Questions
how many U-100 syringe units are in 0.1 mL
On a U-100 barrel, 0.1 mL is 10 graduations and a full 1 mL is 100. Each graduation is 0.01 mL, so the scale works as a fine volume measure for laboratory transfers. The calculator converts the volume holding your target amount into these graduations automatically.
how do you calculate peptide concentration after reconstitution
Divide the peptide in the vial, in milligrams, by the volume of diluent added, in millilitres. A 5 mg vial in 2.5 mL gives 2 mg/mL, or 2,000 mcg per mL. To find the volume holding a target amount, divide the target in mcg by the concentration in mcg per mL: 200 mcg at 2,000 mcg/mL is 0.1 mL.
does the peptide calculator give dosing advice
No. It performs concentration and volume arithmetic for preparing laboratory solutions and nothing more. AminoBlend products are not TGA approved and are supplied for research use only, not for human or veterinary use. Treat the results as bench measurements for assays and dilutions.
What is the best free peptide calculator?
A good free peptide calculator states its formula, accepts the vial fill in milligrams and the diluent in millilitres, and shows concentration, volume and U-100 graduations together so errors are easy to catch. This page does that in the browser with no app or sign-up, and compound pages such as the retatrutide and GHK-Cu calculators come preset to our vial sizes.
What is the best syringe for reconstituting peptides?
Use a 1 mL syringe with a longer needle, such as a U-100 29G 12.7 mm, to add the diluent, because it reaches the vial floor and moves 2 to 3 mL quickly. For measuring small volumes from the stock, choose the smallest barrel that holds the volume, usually a 0.3 mL or 0.5 mL U-100 syringe, for finer graduations.