Rex says
Everyday utility math — the kind you'd otherwise pull up four browser tabs for. I keep it to one clean answer.
Try a scenario
Click to load — tweak from there.Inputs
Result
Monthly food cost
$38.00
Daily cost
$1.25
Annual cost
$456
Lifetime cost
$4,563
Days per bag
48
Psst — share this and help Rex grow
One click, a permanent link with your numbers baked in.
How to use this
- 1Enter pet weight (lb).
- 2Enter cups per day per 10 lb.
- 3Enter bag price ($).
- 4Enter bag size (lb).
- 5Enter expected years remaining.
- 6Read your monthly food cost on the right — it updates as you type.
- 7Hit Share to keep the scenario or send it to someone.
About this calculator
Feeding cost scales with your pet's weight and the price per pound of food. Small changes in brand add up over a 12-year lifespan.
Worked example
Using the values the calculator loads with:
Inputs
- Pet weight: 50 lb
- Cups per day per 10 lb: 0.5
- Bag price: 60 $
- Bag size: 30 lb
- Expected years remaining: 10
Results
- Monthly food cost: $38.00
- Daily cost: $1.25
- Annual cost: $456
- Lifetime cost: $4,563
- Days per bag: 48
What each field means
Inputs
- Pet weight (lb)
- The pet weight used in the calculation, measured in lb. Starts at 50 lb so you have a working example on load.
- Cups per day per 10 lb
- The cups per day per 10 lb used in the calculation. Starts at 0.5 so you have a working example on load.
- Bag price ($)
- The bag price used in the calculation, measured in $. Starts at 60 $ so you have a working example on load.
- Bag size (lb)
- The bag size used in the calculation, measured in lb. Starts at 30 lb so you have a working example on load.
- Expected years remaining
- The expected years remaining used in the calculation. Starts at 10 so you have a working example on load.
Results
- Monthly food cost
- Returned as a money amount in US dollars and shown as the headline result. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Daily cost
- Returned as a money amount in US dollars. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Annual cost
- Returned as a money amount in US dollars. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Lifetime cost
- Returned as a money amount in US dollars. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Days per bag
- Returned as a decimal number. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
FAQ
How does the pet food cost calculator work?
Feeding cost scales with your pet's weight and the price per pound of food. Small changes in brand add up over a 12-year lifespan. The underlying maths is: Daily cups × cost per cup × 365
What do I need to enter?
5 values: pet weight, cups per day per 10 lb, bag price, bag size, and expected years remaining. Each field starts with a sensible default, so you can change one number at a time and watch the result move.
What does the monthly food cost result mean?
It is returned as a money amount in US dollars and updates live as you edit the inputs, so you can compare two or three versions of a scenario in a few seconds.
Is this calculator free, and do I need an account?
Yes, it's free, and no account is required. Nothing you type is stored on our servers — the maths runs entirely in your browser.
How accurate is the result?
It applies the standard formula exactly, so the arithmetic is precise. Estimates assume standard, average conditions — local rules, pricing, and materials vary.
Who is this tool for?
It's built for anyone doing everyday planning maths — a quick estimate that would otherwise need four browser tabs and a calculator app.
Accuracy and limitations
- Estimates assume standard, average conditions — local rules, pricing, and materials vary.
- Results are rounded for readability; add a buffer before ordering, booking, or committing.
- Double-check anything with a real cost attached against a local quote.
Cite this calculator
Writing about this topic? Grab a citation — every link helps keep these tools free.
RevenueLab. (2026). Pet Food Cost Calculator. Retrieved from https://www.revenuelab.fyi/toolbox/pet-food-cost
<p>Source: <a href="https://www.revenuelab.fyi/toolbox/pet-food-cost" target="_blank" rel="noopener">Pet Food Cost Calculator — RevenueLab</a> (2026).</p>
Source: [Pet Food Cost Calculator — RevenueLab](https://www.revenuelab.fyi/toolbox/pet-food-cost) (2026).