Gas Cylinder Cost Split Calculator

Every other shared bill arrives monthly. Gas does not. A cylinder lasts as long as it lasts — six weeks, two months, five weeks if someone starts cooking more — and it gets refilled on a random Tuesday that has nothing to do with the 1st of the month.

That mismatch is the whole reason gas causes more arguments than electricity or internet in a shared flat. When a cylinder spans two months and somebody moved out in between, “split it equally” has no obvious meaning. Split it among who — the people living there when it was bought, or when it ran out?

The fix is to stop thinking in cylinders and start thinking in person-days. Take the days the gas actually lasted and divide the total by days × people. On the default figures — ₹1,100 plus ₹50 delivery, three people, 45 days — that is ₹8.52 per person per day. Now anyone's share is just their days multiplied by that rate, regardless of when they arrived or left.

Same cylinder: ₹1,150 total, 45 days, three flatmates — except the third moved out on day 20. Here is the difference between the two methods:

C is charged ₹174 more than they should be under an equal split — for gas burnt after they had already gone. On a ₹1,150 cylinder that is a 45% overcharge on their fair share, and it is the kind of quiet unfairness nobody notices until they are the one leaving.

The same arithmetic covers someone who was travelling for three weeks, or a flatmate who eats out most nights. If one person cooked on only 10 of the 45 days, their fair share is ₹115 rather than ₹383 — a ₹268 difference. Whether you apply that strictly is a household decision; the point is knowing the number before deciding to ignore it.

Two things are worth knowing before you enter a price. The domestic 14.2 kg cylinder is partially subsidised for eligible consumers, with the benefit transferred to the registered consumer's bank account rather than shown as a discount at delivery. The commercial 19 kg cylinder carries no subsidy and is market-linked, which is why PGs and hostels using commercial connections pay a substantially different rate per kg.

Prices are also revised periodically and vary by city — in late July 2026 the domestic 14.2 kg cylinder was around ₹942 in Delhi, ₹941.50 in Mumbai, ₹968 in Kolkata and ₹994 in Hyderabad. So enter the amount on your own invoice rather than a remembered figure, and if a subsidy lands in one flatmate's account, decide up front whether the split uses the gross price paid or the net cost after that credit. Both are defensible; only one should be in use.

Gas disputes are almost always memory disputes: nobody wrote down when the last cylinder arrived, so nobody can say how long it lasted or who was around. Two entries in a shared note solve it — the delivery date with the invoice amount, and the date it ran out. That is enough to compute person-days later without anyone reconstructing the month from memory.

Agree the method once, in advance, rather than after a cylinder has been consumed. Equal split is perfectly fine for a stable household where everyone is around and cooks — it is simpler and needs no bookkeeping. Person-days is worth the effort when people travel, or when flatmates change mid-cycle. Choosing after the fact is what turns arithmetic into an argument, because by then someone already knows which method favours them.

If gas is one of several heads you divide each month, the shared expense split calculator totals them together, and the monthly housing cost calculator shows what the household actually costs once rent, maintenance and every utility are added up.

Everything here is computed in your browser from the values you enter — nothing is uploaded and no account is needed. LPG prices change and vary by city and connection type, so the figures are only as accurate as the invoice amount you type in. How a household chooses to divide its costs is a private arrangement, and this is a calculator for it rather than advice on it.