KLOW calculator
Syringe units, draw volume and the exact amount of GHK-Cu, BPC-157, TB-500 and KPV in any draw from an 80 mg KLOW vial. Enter the water added and an amount as total blend, as one peptide, or as syringe units.
Result
7.5units
on a U-100 insulin syringe for 2 mg of blend at 3 mL
- Volume
- 0.075
- mL
- Concentration
- 26.7
- mg/mL
- Draws per vial
- 40
- at this amount
What this draw contains
| Peptide | In vial | In this draw |
|---|---|---|
| GHK-Cu | 50 mg 62.5% | 1,250 mcg1.25 mg |
| BPC-157 | 10 mg 12.5% | 250 mcg0.25 mg |
| TB-500 | 10 mg 12.5% | 250 mcg0.25 mg |
| KPV | 10 mg 12.5% | 250 mcg0.25 mg |
Opens with the setup entered most often in the snapshot below. That is a count, not a suggestion.
Reconstitution chart: 1, 2 and 3 mL
One 80 mg vial at the three water volumes most often entered. The 2 mg and 4 mg columns are two amounts that appear in community-reported KLOW protocols and in the setups visitors enter here; they are examples for the arithmetic, not suggested amounts.
| Water added | Blend per mL | 10 units hold | 2 mg of blend | 4 mg of blend |
|---|---|---|---|---|
| 1 mL | 80mg/mL | 8 mg | 2.5 units0.025 mL | 5.0 units0.050 mL |
| 2 mL | 40mg/mL | 4 mg | 5.0 units0.050 mL | 10.0 units0.100 mL |
| 3 mL | 26.7mg/mL | 2.67 mg | 7.5 units0.075 mL | 15.0 units0.150 mL |
Each peptide’s concentration after mixing
| Water added | GHK-Cu (50 mg) | BPC-157, TB-500, KPV (10 mg each) |
|---|---|---|
| 1 mL | 50 mg/mL500 mcg per unit | 10 mg/mL100 mcg per unit |
| 2 mL | 25 mg/mL250 mcg per unit | 5 mg/mL50 mcg per unit |
| 3 mL | 16.67 mg/mL166.7 mcg per unit | 3.33 mg/mL33.3 mcg per unit |
U-100 syringe: 100 units = 1 mL, so one unit is 0.01 mL.
Most common setups entered
1,328 calculations, October 10, 2026 to October 18, 2026
The water volume and amount visitors entered into KLOW calculators we operate, counted from their calculator logs. Every setup here uses the 80 mg vial.
| Water | Amount | Units | Count | Share |
|---|---|---|---|---|
| 3 mL | 2 mg | 7.5 units | 526 | 39.6% |
| 2 mL | 4 mg | 10.0 units | 286 | 21.5% |
| 3 mL | 4 mg | 15.0 units | 252 | 19.0% |
| 3 mL | 8 mg | 30.0 units | 43 | 3.2% |
| 1 mL | 2 mg | 2.5 units | 38 | 2.9% |
These counts report what was entered, not a recommendation, and they say nothing about whether any setup is safe or effective. Setups entered fewer than 30 times are left out, and the block is hidden entirely below 100 calculations. A calculator's opening values are only counted once a visitor changes something, so the setup a calculator opens with is under-counted. The logs hold setup values and daily counts only: no names, accounts or IP addresses. Snapshot taken October 18, 2026.
How the math works
Four lines of arithmetic produce every number on this page. Nothing is estimated or looked up.
1. Concentration
80 mg ÷ water (mL) = mg of blend per mL
2. Draw volume
amount (mg) ÷ concentration = mL
3. Syringe units
mL × 100 = units on a U-100 syringe
4. Each peptide
amount × (peptide mg ÷ 80) = mg of that peptide
Worked through for 2 mL of water and 2 mg of blend: 80 ÷ 2 = 40 mg/mL; 2 ÷ 40 = 0.05 mL; 0.05 × 100 = 5 units. That draw holds 2 × 0.625 = 1.25 mg of GHK-Cu and 2 × 0.125 = 0.25 mg (250 mcg) each of BPC-157, TB-500 and KPV.
Entering one peptide runs step four backwards: 250 mcg of BPC-157 needs 0.25 ÷ 0.125 = 2 mg of blend. Entering syringe units runs steps two and three backwards. Results are rounded for display only, to one decimal for units and to the nearest mcg for each peptide; the underlying math is unrounded. The About page describes how the formulas are tested.
Questions about the math
How is the concentration of a mixed KLOW vial worked out?
Divide the 80 mg in the vial by the millilitres of bacteriostatic water added. 1 mL gives 80 mg/mL, 2 mL gives 40 mg/mL and 3 mL gives about 26.7 mg/mL of total blend. Each peptide's own concentration follows the same rule: GHK-Cu is 50 mg divided by the water volume, and BPC-157, TB-500 and KPV are each 10 mg divided by it.
How many units on a U-100 syringe is 2 mg of KLOW?
It depends only on the water volume. 2 mg of blend is 2.5 units at 1 mL, 5.0 units at 2 mL and 7.5 units at 3 mL. On a U-100 syringe 100 units equal 1 mL, so units are the draw volume in mL multiplied by 100.
How much of each peptide is in 10 units of KLOW?
At 2 mL of water, 10 units hold 4 mg of blend: 2,500 mcg of GHK-Cu and 500 mcg each of BPC-157, TB-500 and KPV. At 3 mL, the same 10 units hold 2.67 mg of blend: about 1,667 mcg of GHK-Cu and 333 mcg of each of the other three.
Why can't the four peptides in KLOW be measured separately?
They are dissolved together in one vial, so every draw carries all four in the label ratio of 50/10/10/10. GHK-Cu is always 62.5% of the amount drawn and each of the other three is 12.5%. Changing the water volume changes how concentrated the solution is, not the ratio. Setting a target for one peptide fixes the amount of the other three.
Does adding more water change the amount of peptide in a draw?
No. More water lowers the concentration, so the same amount of peptide takes up more volume and more syringe units. The total in the vial stays 80 mg whichever volume is used. Larger volumes make small amounts easier to read on the syringe scale; smaller volumes keep larger amounts within one syringe.
How many draws does one 80 mg vial hold?
Divide 80 mg by the amount per draw: 40 draws at 2 mg and 20 draws at 4 mg. That is arithmetic on the label amount. Liquid left in the syringe hub and at the bottom of the vial means the practical count is usually a little lower.
How long is mixed KLOW reported to keep?
Community reconstitution protocols commonly describe refrigerating the mixed vial at 2 to 8 °C and using it within about 28 days, a figure that matches the usual discard window printed for opened multi-dose bacteriostatic water. That is a reported convention, not a tested shelf life: this site has not found published stability data for the four-peptide blend.
What does the 50/10/10/10 on a KLOW label mean?
It lists the milligrams of each peptide in the vial: 50 mg GHK-Cu, 10 mg BPC-157, 10 mg TB-500 and 10 mg KPV, 80 mg in total. Labels from different sellers can list the peptides in a different order. The calculator assumes this 80 mg composition, so a vial labelled differently needs different math.
Further reading
The per-peptide split, with the published research behind each component, is on the components page. For single peptides and other blends, there are calculators for other research peptides. A longer write-up of documented KLOW protocols, research and vendor comparisons is in the KLOW blend research guide.