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Dog Food Calculator
Calculates a dog’s daily calorie requirement from body weight and life stage, converted to cups using the food’s own energy density.
Calculators
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Free, unlimited
Enter your figures and press Calculate.
In short
Dog Food Calculator is a free online tool on inputtesthub.com that calculates a dog’s daily calorie requirement from body weight and life stage, converted to cups using the food’s own energy density. It needs no account, no download and no payment, and there is no daily usage limit. Everything is processed inside your own browser, so the data you paste is never uploaded to a server.
How to use the Dog Food Calculator
- Enter your figures in the input fields.
- The result updates as you type, together with the full working.
- Check the breakdown table to see exactly how the number was reached.
About the Dog Food Calculator
The Dog Food Calculator calculates a dog’s daily calorie requirement from body weight and life stage, converted to cups using the food’s own energy density. It runs as plain JavaScript inside the page, which means there is no upload step, no queue and no size limit imposed by a server — the only limit is your own device.
What people use it for
- Setting a starting portion for a new food.
- Adjusting after neutering, when needs drop.
- Checking a bag’s feeding guide against your dog’s actual weight.
Details
| Formula | 70 × kg^0.75 |
|---|---|
| Neutered adult | × 1.6 |
| Working dog | × 3.0 |
| Weight loss | × 1.0 |
| Treats | Under 10% of daily calories |
The maths behind it
This tool uses Resting energy requirement = 70 × weight in kg^0.75, multiplied by a life-stage factor from 1.0 for weight loss to 3.0 for a working dog. Every intermediate value is shown on screen, so the result can be checked by hand.
Feed to body condition, not to a chart. You should be able to feel the ribs easily and see a waist from above — if you cannot, reduce regardless of what any calculation says. Puppies, pregnant dogs and any dog with a health condition need a vet’s plan.
Frequently asked questions
How much should I feed a 20 kg dog?
A neutered 20 kg adult needs roughly 1,060 kcal a day — about 3 cups of a 350 kcal/cup food. Check the kcal figure on your own bag, because it varies from about 300 to over 500.
Why did my dog gain weight after being neutered?
Energy needs drop by roughly 20–30% after neutering while appetite does not, so the same portion becomes an overfeed. Switching the life stage above from intact to neutered shows the difference.
Is the Dog Food Calculator free, or is there a paid tier?
Free, unlimited, and no email address required. You can use it a hundred times a day and nothing changes.
Can you see what I put into this page?
No. The Dog Food Calculator runs entirely in your browser using JavaScript. Because the work happens locally, the page also keeps working if your connection drops, and closing the tab is all it takes to discard everything.
How is the result calculated?
It uses Resting energy requirement = 70 × weight in kg^0.75, multiplied by a life-stage factor from 1.0 for weight loss to 3.0 for a working dog. The full working is printed under the result, so you can follow every step rather than trusting a black box.
When would I actually need the Dog Food Calculator?
The jobs it is built for: setting a starting portion for a new food. Adjusting after neutering, when needs drop. Checking a bag’s feeding guide against your dog’s actual weight. It is built for exactly those cases rather than being a general-purpose tool with this bolted on.
Is there anything to watch out for?
Feed to body condition, not to a chart. You should be able to feel the ribs easily and see a waist from above — if you cannot, reduce regardless of what any calculation says. Puppies, pregnant dogs and any dog with a health condition need a vet’s plan.
Which values should I know?
Formula is 70 × kg^0.75. Neutered adult is × 1.6. Working dog is × 3.0. These are printed on the page itself, so you do not have to take them on trust.
Is the number rounded?
The calculation runs in double precision and the result is shown to ten significant figures, so converting a value and converting it back returns the original. What is displayed is rounded for readability; what is copied is not.
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