Help
Help & supplies
Use the numbers from your label and instructions. We check the math. We do not tell you what to take or what to mix.
Looking for BAC water?
We may earn a commission. We don’t add a markup; you buy directly from our partner. For laboratory research only. Not for human consumption or veterinary use.
Check the product instructions first. A link is not advice to use it.
What to have ready
Start with the instructions for your exact product.
- The right liquid. Use the liquid named in those instructions. Not every product uses BAC water.
- A way to measure it. Check the scale and the marks on your device.
- A record of your numbers. Keep the label and your result together.
We may earn a commission. We don’t add a markup; you buy directly from our partner. For laboratory research only. Not for human consumption or veterinary use.
The supplier’s water is for lab research only. We do not decide which product you need.
Need to count vials? Use the supply calculatorHow the reverse calculation works
Convert the entered amount to mg and the U-100 reading to mL. Final volume equals total mass multiplied by that measurement volume, divided by the entered amount.
Example: 10 mg × 0.1 mL ÷ 0.5 mg gives a hypothetical 2 mL final volume. That relationship assumes a uniform solution. It does not check displacement, product compatibility, losses or container capacity.
Do not use convenience as a preparation instruction
Use the final volume and diluent specified for the exact product. If a result conflicts with those instructions or the actual device, resolve the mismatch with the responsible professional. Do not change a formulation just to reach a round syringe mark.
Formulas and limits · All calculators · Report a calculation issue
How the math worksReport a problemPrivacy
Optional usage analytics and masked session recordings are off unless you allow them. Calculations work either way.
PrivacyReverse BAC water calculation
Try the math in reverse. Enter an amount and a U-100 reading. This shows an example volume, not mixing instructions.
Choose the exact product before entering numbers. IU products, blends, solutions and lab water open their own calculators.