Converting U40 insulin units for U100 insulin syringes

What is the difference between a U40 insulin syringe and a U100. Well the main difference is that the markings measurements are for different concentration of insulin. U40 insulin has 40 units of insulin in every ml and the U100 has 100 units. Therefore when converting from a U40 syringe to a U100 syringe you are required to multiply your U40 units by 2.5.

40 x 2.5 = 100

Never use U100 insulin with a U40 syringe, you will put your animals life in danger. Consult your vet if you need more information.

Below is a conversion chart with calculation already done. 

 Please ensure you consult your vet before you use this chart. The veterinarian will ensure you have done the calculations correct and the right dose is given. 

RayMed sells insulin syringes 

• 1ml syringe with 29g needle 1/2" inch
• 0.5ml syringe with 29g needle 1/2" inch
• 0.3ml syringe with 29g needle 1/2" inch
• 1ml syringe with 30g needle 5/16" inch
• 0.5ml syringe with 30g needle 5/16" inch
• 0.3ml syringe with 30g needle 5/16" inch

U100 syringe come in 1ml, 0.5ml and 0.3ml. The syringes are more commercially available and with our fast UK dispatch you will receive your order in no time. if your diabetic cat or dog requires a small dose of insulin you may benefit from our 0.5ml & 0.3ml range. The markings are more spaced out allowing a more precise dose of insulin to be withdrawn & injected. Please read our previous article if you need help in deciding your syringe size (Click Here).

If you are using diluted insulin all the calculations will change and the above chart will not apply to you. The diluted factor must be clearly labeled on the insulin bottle and your vet must show you which syringe to use and dosage amount.   

This article is for information purpose only. Please consult your vet before administrating insulin.