Pet Glucose Converter
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Convert glucose readings between mg/dL and mmol/L for diabetic dogs and cats.
Used in the UK and most other countries
Used in the United States
Note: Your vet sets your pet's target range and tells you which readings should make you call them.
Understanding the numbers
UK readings are usually shown in mmol/L, while US readings are usually shown in mg/dL. The units differ, but the underlying glucose measurement is the same.
Target ranges depend on species, timing, treatment and the individual pet. Your vet sets your pet's range and interprets the readings — ask them which numbers should make you call.
Below 3.3 mmol/L is a critical low needing immediate veterinary contact. If your pet is weak, wobbly, trembling, confused, collapsed or seizing, treat it as an emergency.
Common questions
How do I convert mg/dL to mmol/L?
Divide the mg/dL reading by 18 to get an approximate mmol/L value. Use the converter above and discuss readings with your vet.
Why do glucose readings use different units?
The UK and many other countries use mmol/L, while the US commonly uses mg/dL. They describe the same measurement using different scales.
What is a critical low glucose reading?
Below 3.3 mmol/L is a critical low needing immediate veterinary contact. If your pet seems unwell, follow your emergency plan and contact a vet immediately.