Budgeting for a guinea pig pair means budgeting for appetite: two small herbivores who eat hay all day, need fresh vegetables daily, and live on bedding you replace constantly. A realistic planning range for the pair is about $95 to $145 a month, offered as a planning estimate that varies by area, season, and store, not as a fixed price. The breakdown below adds up to that same total at both ends, so you can swap in your local prices line by line and keep the total honest.
Hay: $30 to $45 a Month
Hay is the largest staple and the one item you can never let run out, at about $30 to $45 a month for the pair. Guinea pigs need hay available at all times: the fiber keeps digestion moving and the chewing wears teeth that grow continuously. A pair works through hay for eating, burrowing, and soiling far faster than a new owner expects, so most of a bag is not waste, it is the job. Buying a larger bale or box, where you have dry storage, usually brings this line down, while small pet-store bags push it toward the top of the range.
Fresh Vegetables: $35 to $55 a Month
Fresh vegetables run about $35 to $55 a month and carry a nutritional duty pellets alone do not cover. Guinea pigs cannot make their own vitamin C, so a daily cup of fresh vegetables per pig, built around leafy greens and vitamin C rich choices such as bell pepper, is a health requirement, not a treat. Wash produce, rotate what you offer across the week, and remove wilted leftovers so the enclosure stays clean. Market and seasonal buying can trim this line, but skipping vegetable days to save money trades a small saving for a real deficiency risk.
Pellets: $10 to $15 a Month
Pellets are the smallest food line at about $10 to $15 a month, because they play a supporting role beside hay and vegetables. A plain, uniform pellet made for guinea pigs, ideally fortified with vitamin C and fed in a small measured amount per pig each day, helps cover gaps without encouraging selective eating. Mixed seed-and-piece blends cost similar money but let pigs pick favorites and leave nutrition behind, so plain pellets are the better spend. Store the bag sealed and dry, and replace it on schedule, since vitamin C in opened pellets fades over time.
Bedding: $20 to $30 a Month
Bedding runs about $20 to $30 a month for an appropriately sized enclosure for a pair, and it rises with enclosure size, which is a good problem to have. The pair needs an absorbent layer deep enough to keep feet dry, with spot-cleaning of wet corners between full changes. Paper-based bedding, fleece liners with wash costs, or other suitable options land differently in different homes, so price the system you will actually keep up with. Add occasional replacements outside the monthly range, such as water bottles, hides, and chew items, plus routine veterinary care and an emergency reserve, which sit on top of the $95 to $145 everyday total.
Keep the Pair's Notes With the Pair
Track your real spending for two or three months against these four lines, because your local total teaches you more than any general range. Note which vegetables the pair eats eagerly, which hay they waste, and what each pig weighs, since cost and health notes belong together. Should the pair ever move to a new keeper, that record prevents a gap in diet or budget on day one. Owners using KinsLe can attach the pair's feeding history and monthly cost notes to the Transferrable Profiles record whenever the guinea pigs change homes.