Try the tool above
Use the free tool at the top of this page first, then read the guide below to understand the result and use it well. This tool works out how much to feed a hamster each day. Choose the species and enter the weight, and the tool gives a daily seed-mix amount plus a fresh-food portion. Syrian hamsters eat more than tiny Roborovski hamsters, so species matters as much as weight.
How to use it
Start by entering the numbers the tool asks for, using real measurements where you can, then press the calculate button and read the result box carefully. Check the result against common sense for your own setup, adjust one input at a time if the answer surprises you, and use the result as a daily plan rather than a one-off number.
Worked example
For example, a 150-gram Syrian hamster gets 12 grams of seed mix plus 12 grams of fresh food per day, a total of 24 grams. A 25-gram Roborovski gets only 6 grams of seed mix, which shows why one fixed amount for every hamster would badly overfeed the small species.
How the calculation works
The tool uses a simple, transparent rule based on the numbers you enter, so you can check the answer by hand if you ever doubt it. It does not guess, hide its working, or pretend to know more than the inputs allow, and that honesty is deliberate, because a pet care plan you can follow matters more than a complicated formula you cannot trust. If you change one input, such as weight or species, the result moves in the direction you would expect, which is a good quick check that you typed the numbers correctly.
Why this matters
Overfeeding is one of the most common hamster problems, because a hamster hoards food and an owner keeps refilling a bowl that looks empty. A measured daily amount keeps weight steady, prevents selective eating of only the tasty seeds, and makes weight changes easy to spot.
Keep the routine going
The best plan is the one you actually repeat, so tie the result to something you already do every day, such as the morning feed, the evening tidy, or the weekly shop. Keep the tool result visible for the first two weeks, note any day you miss, and do not restart from scratch after a missed day, because one missed day matters far less than giving up the routine entirely and starting again next month.
Three tips that help
Weigh the food for the first two weeks, so your eye learns what the right portion looks like. Remove uneaten fresh food after a few hours, because it spoils quickly in a warm cage. Offer fresh food in small pieces, and rotate vegetables across the week for variety.
Common mistake to avoid
The common mistake is topping up the bowl all day, which hides hoarding and leads to obesity, so feed once a day and check the hoard at cleaning time.
Frequently asked question
Should a hamster get unlimited seed mix? No. Unlimited seed mix leads to selective eating and weight gain. A measured daily portion, plus hay and fresh food, keeps the diet balanced and the weight under control.
Put the result into practice
Save or print your result, put it where the person who feeds or cares for your animals will see it, and review it whenever weight, species, or cage setup changes. Small steady routines beat perfect plans that nobody follows, so keep the plan simple, repeat it daily, and adjust slowly when the numbers tell you something has changed.
Keep the routine steady for at least two weeks before judging it, because animals adjust slowly and a single day tells you very little about a plan. Record what you did each day in a short note, compare the notes at the end of the fortnight, and only then change one thing at a time, so you always know which change helped and which change did not help at all. A calm, steady owner teaches an animal far more than a perfect tool, so use the result, watch the animal, and trust what you see over time.