Sri Lanka LP Gas Price Calculator — Litro & Laugfs

The calculator does three things in one place: it looks up the current Maximum Retail Price (MRP) for the cylinder you choose, it shows the cost-per-kg of LP gas so you can compare sizes and brands on a level basis, and it estimates how much cooking gas your household actually uses in a month so the price translates into a real budget figure.

The MRP lookup

Under the Consumer Affairs Authority Act No. 09 of 2003, the CAA gazettes a Maximum Retail Price for every LP gas cylinder size sold to Sri Lankan households. The MRP is binding — a dealer cannot legally charge above it. Both Litro Gas Lanka PLC and Laugfs Gas PLC also publish their current MRPs on their official websites, and the calculator's figures are cross-checked against both sources on the date shown in the verification banner. The lookup itself is a deterministic table — for cylinder size S and brand B, total cylinder cost is MRP(B, S) × quantity, plus a district-banded delivery surcharge if home delivery is selected.

Cost per kg and why size matters

Cylinder MRP divided by net LP gas weight gives the cost-per-kg. The largest cylinder a household can practically store is always the cheapest source of LP gas: a 12.5 kg Litro at Rs 4,055 works out to about Rs 324.40 per kg, whereas a 5 kg Litro at Rs 1,685 costs Rs 337.00 per kg — roughly Rs 13 more per kg for the same product. The 2.3 kg is the most expensive per kg of all because the cylinder, valve and refill labour cost are spread over less gas. The calculator surfaces the per-kg figure for every size in the brand you pick so the comparison is on the page rather than in your head.

The household consumption model

A standard domestic burner outputs about 2.5 kW. LP gas releases ~46 MJ of energy per kg, so the burn rate at full flame is 2.5 × 3.6 ÷ 46 ≈ 0.196 kg/h. Real-world cooking averages around 60% of full flame across a session — simmering, low heat for rice, lid on — which gives the working figure of 0.12 kg per burner-hour the calculator uses. Daily consumption scales with cooking time and household size:

daily_kg     = 0.12 × cooking_hours_per_day × max(1, household / 4)
monthly_kg   = daily_kg × 30
monthly_cost = monthly_kg × cost_per_kg
refill_days  = (cylinder_kg × quantity) / daily_kg

The household factor is linear above a four-person reference and flat at one for smaller households — Sri Lanka's national domestic-energy survey shows two-person and four-person homes don't actually halve their cooking time, they roughly halve their burner intensity instead, so the consumption per cooking hour is similar and the household scaling kicks in once you go above the reference. The refill-frequency figure tells you how many days the gas you've bought will last at the consumption rate you entered, which is usually the most useful single number on the page. Once you have the monthly cooking-gas figure, line it up against your other household running costs: the Sri Lanka electricity bill calculator and the water bill calculator use the same tariff-to-monthly-rupees approach, so the three together give you a realistic picture of monthly utility spend.

The pricing formula

The May 2022 Cabinet-approved automatic pricing formula decomposes every LKR of LP gas MRP into four components: roughly two-thirds Saudi CP × USD/LKR (the raw landed-cost component), about 9% import duty and excise, 8% PAL / SSCL / VAT, and the remaining 15–20% distributor margin and cylinder-operating overhead. The exact split is republished each month with the new MRP. The stacked bar at the bottom of the calculator shows the typical share each component contributes to the cylinder you've selected, so you can see how much of your refill bill is the gas itself versus tax and distribution.

LP gas is not the only household essential priced on a cost-reflective formula — pump fuel revises the same way, which you can model in the Sri Lanka fuel cost calculator. To see how these monthly cylinder revisions stack up in real terms across several years, compare them against the Sri Lanka inflation calculator, which tracks how the rupee's purchasing power has shifted over the same period.

Edge cases the calculator handles

Three edge cases worth flagging. (1) Zero or non-numeric inputs surface a specific error message in the field — the calculator will not show a NaN or a silent zero. (2) Picking a district that isn't on the brand's published delivery list falls back to a flat outstation surcharge instead of returning undefined. (3) Quantity above 20 cylinders is rejected because at that volume you should be talking to the brand's commercial sales team, not a household-scope calculator. The cross-check formula (cost-per-kg × cylinder weight = MRP) is wired in as an automated sanity check on each result row, so a typo in the MRP table would surface as a mismatch rather than a silent wrong answer.

Three scenarios that map to the most common Sri Lankan LP gas buying decisions, worked end to end. Plug each one into the calculator above — the figures should match to the rupee.

• Consumer Affairs Authority of Sri Lanka — gazetted MRP
• Litro Gas Lanka PLC — official pricing page
• Laugfs Gas PLC — official site
• Ministry of Power & Energy — automatic pricing formula (May 2022)

The MRPs and delivery surcharges on this page were last cross-checked against the CAA price notice, April 2026 and the official brand pricing pages on 2026-05-17. The page is reviewed at the start of every month when CAA gazettes the new notice; if you spot a discrepancy with the live brand site, email the address below and the fix usually ships within 24 hours. There are currently 8 cylinder MRPs in the lookup table covering both Litro and Laugfs across all four household sizes.