Insulin doses are set by your veterinarian from a blood glucose curve. This tool only converts an already prescribed dose in units into the mark on the syringe in your hand and the matching volume in mL. It does not derive a dose from body weight or a glucose reading, it does not suggest how much to raise or lower a dose, and it does not ask you to pick a product.
The math is dose in units divided by strength in U/mL, which gives the volume in mL, and the mark is that volume multiplied by the strength the syringe is calibrated for. U-100 insulin holds 100 U per mL, so 1 U is 0.01 mL, and U-40 insulin holds 40 U per mL, so 1 U is 0.025 mL. No body publishes a conversion table for this; the arithmetic falls straight out of the definition of the strength. When the strength and the syringe disagree, reading the mark as units gives 2.5 times or 0.4 times the prescribed dose, which is why product inserts and veterinary references all tell owners to match the U-40 or U-100 label to the syringe. Figures are as of October 2026.
Changing a dose on your own risks life threatening hypoglycemia. If you see wobbling, seizures or collapse, rub honey or syrup on the gums and get emergency care immediately. This tool is for reference only and does not replace veterinary care. Contact your veterinarian right away if you notice symptoms or suspect a problem.
Frequently Asked Questions
No. Dose changes based on glucose are decided by your veterinarian from a blood glucose curve. This tool only converts an already prescribed dose into marks and mL.
Reading U-100 insulin on U-40 syringe marks delivers 2.5 times the dose, and reading U-40 insulin on U-100 syringe marks delivers 0.4 times the dose.
Adding extra on your own carries a high risk of hypoglycemia. Do not double up on a missed dose; call your veterinarian for instructions.