One weekly total, split evenly.
Enter a weekly total and how many injections you've chosen to split it into. Add your vial to turn each split into syringe units. For tracking & education only — it never recommends a dose or how often to inject.
Lumara is a tracking tool and does not provide medical advice, diagnosis, or treatment. This calculator computes the math from the numbers you enter; it never recommends a dose. Always follow your provider's guidance.
How to split a weekly dose across injections
Splitting spreads one weekly total across several smaller injections. The per-injection amount is just the weekly total divided by how many injections you take; adding your vial concentration turns each into units.
- Enter your weekly total exactly as your provider prescribed it.
- Choose how many injections you split it into — the tool divides the total evenly.
- Add your vial (strength and water, or concentration) to convert each split into units.
- Read the units per injection and log each one.
Worked example: 140 mg/week of 200 mg/mL, split into two
A 140 mg weekly total of a 200 mg/mL solution, taken as two injections:
- Per injection (mg) — 140 mg ÷ 2 = 70 mg.
- Volume — 70 mg ÷ 200 mg/mL = 0.35 mL.
- Units to draw — 0.35 mL × 100 units/mL = 35 units per injection.
- Weekly total is unchanged — 2 × 70 mg = 140 mg.
More frequent, smaller injections keep the weekly total the same while lowering each shot’s volume. Enter your own numbers above.
Sources
- HUMULIN R (insulin human) injection, 100 units/mL (U-100): prescribing information and Instructions for Use. Eli Lilly and Company; revised 6/2023. DailyMed, U.S. National Library of Medicine.
- Grissinger M. Misadministration of IV insulin associated with dose measurement and hyperkalemia treatment. P T. 2014;39(11):730-731. PMID: 25395813.
- Frohnert BI, Alonso GT. Challenges in delivering smaller doses of insulin. Diabetes Technol Ther. 2015;17(9):597-599. doi:10.1089/dia.2015.0268.
Frequently asked questions
Divide the weekly total by the number of injections to get the per-injection amount, then convert that to units using your vial concentration. For example, 140 mg a week split into two is 70 mg per shot, which at 200 mg/mL is 0.35 mL, or 35 units. The tool shows every step.
No. Splitting only changes how the same weekly total is spread out; the total is identical. How many injections to take, and whether to split at all, is a decision for you and your provider.
That is a clinical decision the calculator does not make. It simply divides whatever weekly total and injection count you enter and shows the per-injection units. Follow your provider’s guidance on cadence.
No. It is an educational estimation tool that does the arithmetic and shows its work; it never recommends a dose or a schedule. Always follow your licensed provider’s instructions.