Quick answer
Rats (Rattus norvegicus) typically live around 1–2 years in the wild. Wild averages fall when predation, disease, or habitat loss rise; managed populations can live longer with stable food and veterinary care.
Key takeaway
Rats (Rattus norvegicus) typically live around 1–2 years in the wild. Wild averages fall when predation, disease, or habitat loss rise; managed populations can live longer with stable food and veterinary care.
Rat lifespan in the wild
Field and museum records place most rats near 1–2 years in the wild. That figure blends ages at death across regions, so treat it as a planning range. Body size (200–500 g (7–18 oz)) and risk lifestyle both shape the average.
What shortens rat lives
Predation, infectious disease, injury, food shortages, and habitat fragmentation cut survival. Roadkill and human conflict matter wherever rats share landscapes with people.
What helps rats live longer
Connected habitat, low chronic stress, and reliable food support longevity. For captive or domestic relatives, species-correct diet and veterinary screening matter more than generic “pet” advice.
Rat life stages
Juveniles usually face higher mortality than prime adults. Older animals may move less, show dental wear, or lose body condition — useful signs when ageing rats in the field.
Range and history
The brown rat probably originated in northern China and Mongolia and spread worldwide by stowing away on ships and in cargo, reaching Europe in the 1700s. Today it is found on every continent except Antarctica, usually close to people. Its smaller relative, the black rat, was historically linked to the spread of plague, while the brown rat is the species most often seen in modern cities.
Rats and people
Brown rats have a complex relationship with humans. In the wild they are treated as pests because they damage stored food, gnaw structures, and can carry disease. Yet the same species, bred as the fancy rat, is a popular and affectionate pet, and laboratory strains have been central to advances in medicine, psychology, and genetics.
Sources
Rat FAQs
How long do rats live?
Rats (Rattus norvegicus) typically live around 1–2 years in the wild. Wild averages fall when predation, disease, or habitat loss rise; managed populations can live longer with stable food and veterinary care.
What is the scientific name of the rat?
Rattus norvegicus — used in research and conservation listings for rats.
What do rats eat?
Rats eat highly opportunistic, with seasonal and regional variation in Cities, sewers, farms, riverbanks worldwide.
Where do rats live?
They are associated with Cities, sewers, farms, riverbanks worldwide. Local presence depends on food, cover, and human land use.
What is the conservation status of rats?
Listed in our guides as Least Concern. Check the IUCN Red List and national assessments for the latest formal category.