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Horse Hay Calculator

Daily hay from body weight × an activity %, then flakes, bales and cost per day and month.

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Horse Hay Calculator works straight from this page — free, instant, nothing to install. It sits under Pets & animals in our catalogue, alongside Aquarium Heater Wattage Calculator and Aquarium Substrate Calculator.

How to use it

  1. Open the tool — no signup or install needed.
  2. Enter your input or adjust the available options.
  3. Get your result instantly, then copy or download it.

Frequently asked questions

What does Horse Hay Calculator do?

Daily hay from body weight × an activity %, then flakes, bales and cost per day and month.

When would I actually use this?

Day-to-day care: how much to feed at a given weight, whether a size is right for the breed, and what a life stage means in human terms.

What is the most common mistake?

Using the seven-years rule for a dog's age. Ageing is fast in the first two years and then slows, and it slows much more for a small breed than for a large one — the multiplier is not a constant.

Is there a tool for the next step?

Aquarium Substrate Calculator is the closest one after this: Work out how much gravel, sand or aqua soil your tank needs from its shape, footprint and the substrate depth you want.

What else is worth having open alongside it?

Bird Cage Size Calculator and Cat Calorie Calculator — they come up in the same task often enough to be worth a second tab.

Where do the figures come from?

Portions follow published feeding guidelines by species and weight; age equivalences use the size-dependent curves rather than a flat multiplier. None of this replaces a veterinarian, especially for an animal that is unwell.

Further reading

All guides →
How-toHay by Body Weight: Flakes, Bales and a Whole WinterA 500 kg horse at maintenance eats 10 kg of hay a day — four and a third flakes, fifteen bales a month, ninety bales across a hundred-and-eighty-day winter. The activity percentage moves that by nearly half.How-toThe 80/10/5/5 Raw Ration, Worked From Body WeightA 25 kg dog at maintenance eats 625 g a day: 500 g muscle meat, 63 g edible bone, 31 g liver and 31 g other organ. The percentage you pick is worth more than every other input combined — growth is exactly double maintenance.GuideBar Spacing Is the Cage Rule That Actually MattersA budgie needs bars 10 to 13 mm apart and a macaw 25 to 38. Put the budgie in the macaw cage and it can get its head through — the size is a welfare question, the spacing is a safety one.ExplainerFerguson Zones, and the Lamp Distance They ImplyThe same Ferguson zone 3 puts a compact lamp 18 to 30 cm above the basking site and a 54 W tube 74 to 127. The zone describes the animal; the distance belongs to the lamp, and a mesh screen moves it again.How-toThe IATA Crate Formula an Airline Measures at Check-InLength A + half B, width twice C, height D. The width rule is the one that fails people: a dog with 28 cm shoulders needs 56 cm of interior width, and no crate sold by weight rating tells you that.How-toHow Much Substrate Does an Aquarium Need? Depth, Weight and Grain SizeThe depth follows the job: a bare display, a planted tank whose roots need room, an under-gravel plate. Then comes the number people are unprepared for — substrate is what puts a filled tank past what a piece of furniture can hold. Plus why fine sand compacts and coarse gravel traps waste.