Medication labels can look confusing with all their numbers and text, but there's one key piece of information you need: the concentration.
Think of concentration as the strength of your medication. Just like a strong cup of coffee has more caffeine per ounce than weak coffee, a higher concentration medication has more medicine packed into each milliliter of liquid.
What you're looking for: A number followed by either mg/mL or mg/0.5mL (like 10mg/mL or 5mg/0.5mL). Our calculators support both via a unit toggle above the concentration field, so you can enter what you see on the label and we'll convert as needed.
Simple example: If your label says "15mg/mL", that means:
The examples below show you exactly where to find this concentration number on different types of labels.
Most common format showing concentration as X mg/mL:
COMPOUNDED MEDICATION
Tirzepatide 20 mg/mL
For subcutaneous injection only
Qty: 5mL Rx#: 12345
Exp: 03/24/2025
Store refrigerated (2-8°C/36-46°F)
In this format, the concentration is clearly stated as mg per mL. This is the easiest format to read as no calculation is needed.
Sometimes pharmacies list concentration per 0.5mL instead of per full mL. You can now use the unit toggle to select mg/0.5mL and enter the number exactly as shown on your label.
COMPOUNDED MEDICATION
Semaglutide 2mg/0.5mL
Total Volume: 2.5mL
For subcutaneous injection only
Rx#: 67890 Lot#: TZ0224A
Exp: 04/15/2026
Keep Refrigerated
Easy mode: Select mg/0.5mL in the calculator and enter the number from your label. We'll convert to mg/mL automatically.
Manual conversion (optional):
Many pharmacies add extra ingredients like B12, niacinamide, or glycine:
COMPOUNDED MEDICATION Tirzepatide/Niacinamide 8/2 mg/mL Volume: 5mL Rx#: 13579 Exp: 11/30/2026 Lot#: TZN0224B Store in refrigerator Discard after: 28 days from first use
Key rule: Only the tirzepatide or semaglutide concentration matters for dosing. Ignore all the other ingredients and their numbers.
How to find the right number: