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. Hay is the food rabbits eat most, so running out mid-month is a real problem, yet most owners buy it by guesswork. This calculator turns rabbit count and average weight into kilograms per month, plus how many five kilogram bags that means, so you can buy ahead and never face an empty hay rack.
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, two rabbits averaging two kilograms need about six kilograms of hay per month, which is two five kilogram bags. One rabbit of the same weight needs about three kilograms, so one bag covers the month with a little spare.
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, fish count, or tank size, the result moves in the direction you would expect, which is a good quick check that you typed the numbers correctly.
Why this matters
Buying in the right quantity also saves money, because small daily bags cost far more per kilogram than a planned monthly order. Knowing the monthly total lets you compare bag sizes honestly and store hay properly instead of panic-buying the nearest small pack.
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
Store hay in a dry, airy place off the floor, because damp hay goes mouldy fast and mouldy hay must never be fed. Check the bag date and smell before feeding, since fresh hay smells sweet and dusty or musty hay should be replaced. Refill the rack twice a day rather than once, because rabbits eat more when hay looks fresh and plentiful.
Common mistake to avoid
Never let the rack sit empty overnight, because rabbits need to graze through the day and night to keep digestion steady.
Frequently asked question
How much hay does a rabbit eat per month? Roughly three kilograms per month for a two kilogram rabbit, scaling with weight and rabbit count, as calculated here for your household.
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, fish count, or tank 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.