Dung Cake Fuel & Cakes, Energy & LPG Saved

A dung cake is cattle dung shaped by hand into a flat patty and sun-dried until it burns. Dried, it is a traditional cooking fuel across rural India and much of the world — stacked, stored and burnt in a chulha (mud stove) to cook food and heat water. This tool estimates how many cakes your animals' dung makes, the cooking energy in those cakes, and the LPG value it can replace.

Fresh dung is part water; once shaped and sun-dried each cake settles to a fairly standard dry weight. The tool takes your daily dung, applies a moisture and shaping allowance, and divides by the typical dry weight of one cake to give cakes per day. More cattle and heavier feeders give more dung and therefore more cakes.

Dried dung has a calorific value of roughly 12–15 MJ per kg — lower than wood or LPG because of ash and incomplete drying. The tool multiplies the dry mass of your cakes by this calorific value to give the cooking energy in MJ per day, then converts that to the equivalent amount of LPG it could replace.

LPG carries about 46 MJ per kg of usable energy, but a chulha burning dung cakes is far less efficient than an LPG burner. The tool compares the useful energy delivered, not just the raw MJ, so the LPG-equivalent reflects the gas you would actually need to do the same cooking — then prices that gas to show the value saved.

Not very. Open dung-cake fires lose most of their energy to the air and produce smoke. Biogas uses the same dung far more efficiently — anaerobic digestion captures the methane as clean gas and still leaves nutrient-rich slurry as fertiliser. If you have enough dung, a biogas plant gets more cooking energy and a better fertiliser than drying it into cakes.

A typical cow or buffalo drops roughly 10–15 kg of fresh dung per day, depending on size, feed and whether it is stall-fed. The tool lets you enter the dung directly or by herd size so you can scale from a single animal to a whole shed. Fresh dung is mostly water, which is why the dried-cake count is much lower than the raw weight.

By replacing bought LPG (or wood), dung cakes cut a household's cooking-fuel bill. The tool prices the LPG-equivalent at your gas rate to show the daily and monthly value saved. For many rural households this is a real saving — but weigh it against the cleaner, larger saving a biogas plant gives from the same dung.

Largely, yes. Burning dung as fuel returns only ash to the soil and loses the nitrogen and organic matter the dung carried. Composting or digesting the dung keeps that fertiliser value. The choice is a trade-off between cheap cooking fuel today and soil fertility — which is why biogas, giving both gas and slurry, is often the better route.

Yes — buffalo, cow or mixed cattle all work; just enter the right dung per animal and the number of animals. Buffalo generally drop more dung than cows. The dried-cake, energy and LPG-equivalent maths is the same across species, so you can plan fuel for any cattle shed.

They're sound planning figures. Actual cakes, energy and savings vary with how well the dung is dried, the cake size you shape, the calorific value of your animals' dung, and your stove's efficiency. Use the numbers to compare dung cakes against LPG and biogas, then adjust to what you observe on the ground.