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Precision Peptide Tooling

Glow/Klow Calc

Mix any peptide and see exactly where to pull your syringe, or what to dial on your pen. Free, private and works offline.

by VPN Glowrilla Research Hub Guides

My vials

Saved setups, kept on this device only. Tap one to load it.

Draw Line

Drag the bar below, or drag on the syringe itself. Use − / + for 1 unit at a time.

units
0.50 mL
CompoundConc.Per unitThis draw
See example labels

What each box means

  • BAC WATER 3.0 mLThe water you added to the vial.
  • VIAL 100 mgAll the peptide in the vial.
  • PULL TO 7.5 UDraw the syringe up to this line. That is 0.07 mL.
  • DOSE 2.5 mgHow much peptide is in that amount (2,500 mcg).
The same label printed on a Niimbot M2 and wrapped around a pen

The same label printed on a Niimbot M2 and wrapped on a pen.

Niimbot M2 label printer (the small label is sized for it) →

Vial Contents

Standard blend recipe - fixed per vial.

Total peptide / vial 70 mg
mL

Reading units in
mcg = micrograms. Switch to mg if that's easier to read.

Target Draw

Pick a compound and the dose you want - the calculator tells you exactly where to pull the plunger to.

1 mg = 1,000 mcg - same amount, finer reading

Doses left in vial
-

Pen Calculator New

Decode Your Pen. Know Your Dose.

Do not assume pen units and syringe units are interchangeable. Verify the specific pen calibration before using a conversion.

1. Pick your pen

Drag the black knob, the slider, or tap − / + to dial the pen. The peptide amount updates as you dial.
Select pen
-- pen units
How to use it (the simple version)

The big idea: a pen and a syringe are like two different rulers. A "unit" on your pen is not the same size as a "unit" on a syringe. PenSync turns both into mL, the real amount of liquid, so you can compare them.

  1. Tap your pen. Pick V2, V3, V4 or V5. The dot tells you how sure we are: Green: checked by Glow/Klow CalcYellow: typed in, not checkedRed: size unknown, PenSync won't guess Not sure, or your pen shows red? Tap CUSTOM and type what your pen's instruction paper says.
  2. Pick a direction. Use Pen → Syringe if you know the number on your pen. Use Syringe → Pen if you know the line on a syringe.
  3. Check what's in the pen. Pick Single, GLOW or KLOW, check the mg, and enter how many mL of liquid. For a blend, choose Peptide amount and the compound you want (e.g. 1 mg BPC-157). The others come along in the same ratio.
  4. Type your number. The pen setting, the peptide amount, or the syringe units.
  5. Press Calculate. The big glowing card on top is your answer. The smaller cards show the mL and mg behind it.
  6. Want to see how? Tap Show Math for every step.

Example: if 1 pen unit = 0.05 mL, then 10 pen units = 0.5 mL, which is the 50 line on a U-100 syringe, not the 10 line.

See red "Calibration Required"? PenSync doesn't know how much liquid one of your pen's units holds. Look in the pen's instructions for "mL per unit" or "the full pen delivers ___ mL", then enter it under CUSTOM.

2. What's in your pen
mg
mL
What do you want to inject?
Start from

A syringe's units measure volume, not peptide. U-100 = 100 units per 1 mL, so 10 units = 0.10 mL.

See example labels

What each box means

  • BAC WATER 3.0 mLThe water you added to the pen cartridge.
  • SET PEN 7.5 UThe number to dial in the pen's dose window.
  • SYRINGE 7.5 UThe same amount on a U-100 insulin syringe, if you use one instead.
  • DOSE 2.5 mgHow much peptide is in that amount (2,500 mcg).

Niimbot M2 label printer (the small label is sized for it) →

Why pen units ≠ syringe units

PEN

  1. Pen setting (pen units or clicks)
  2. × calibrated mL per pen unit
  3. × concentration = peptide

SYRINGE

  1. Syringe marking (e.g. 10 units on U-100)
  2. ÷ 100 units per mL = 0.10 mL
  3. × concentration = peptide

The two only meet at volume, so PenSync always converts through millilitres. A V4 pen has a 100-unit scale, but the V4 setting that matches 0.10 mL depends on how much liquid those 100 units deliver, which may not be 1 mL. That is why the V4 calibration profile is used instead of copying the syringe number, and why an unknown calibration shows Calibration Required.

Full PenSync: calibration profiles & Check Your Pen → Watch: how to reconstitute in the pen ▶

Educational calculator. It does the math for the numbers you enter and does not recommend doses. Always verify the specific pen's calibration and labeling before relying on a conversion.

Share this setup

The link opens this calculator with the same numbers filled in. The numbers travel inside the link. Nothing is stored online.

Scan with a phone camera to open the same setup.

How it works in 20 seconds

1 Pick what is in your vial

GLOWKLOWAnother peptide
GHK-Cu100 mg

2 Enter the water you added

3 mL

3 Enter how much you want each time

2.5mcgmg

✓ Read your answer

Pull your syringe to7.5 units= 0.075 mL on a U-100 insulin syringe