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CNG & LPG Calculator Hub — Tank Capacity, Fuel Savings & Refill Cost
Calculate tank capacity in liters, kg and m³ — for every country. Estimate refill cost, monthly fuel savings, break-even period, and cost per km. Includes tank size chart, country comparisons, and expert FAQs.
Disclaimer: All figures are estimates for educational and planning purposes only. Actual costs, savings, and capacities vary by vehicle model, location, installer, ambient temperature, station pressure, and local market conditions.
LPG Autogas is stored as a liquid. Tanks are filled to max 80% capacity. Measured in liters or kg (density ≈ 0.54 kg/L at 15°C).
Tank Capacity Calculator
See how much fuel your tank can safely hold in liters, kg, and m³.
Enter the tank size in water liters — this is the physical internal volume printed on the cylinder plate.
L (water)
LPG Max Fill (Liters)
48.0 L
80% of 60LLPG Max Fill (kg)
25.92 kg
at density 0.54 kg/LCNG Capacity (kg)
10.20 kg
at 200 bar, 0.17 kg/LCNG Capacity (m³)
12.00 m³
at 200 bar, 0.20 m³/LRefill Cost Calculator
Estimate full tank refill quantity and cost from pump price.
L
৳/L
Partial Refill Calculator
Know exactly how much fuel and cost you need from any current level.
L
Current amount in tank
L
Current pump price
৳/L
Max Capacity
48.00 L
80% of tankCurrent Fuel
0.00 L
Amount in tank nowRemaining Space
48.00 L
Max additional fillEstimated Cost
৳0.00
48.00 × ৳0.00Fuel Savings Calculator
Estimate your monthly and annual fuel savings after switching to CNG or LPG.
Average km you drive per month
km
৳/L
Your vehicle's fuel efficiency now
km/L
Typical gas vehicle mileage
km/L
Fuel cost comparison assumes LPG costs approximately 38% of petrol price per km, based on typical market price differentials. Adjust mileage inputs to match your vehicle.
Cost Per KM Calculator
Compare running costs across all fuel types. Lowest cost highlighted.
| Fuel | Price (৳/unit) | Mileage (km/L or km/kg) | Cost per km |
|---|---|---|---|
| Petrol | Enter price | ||
| Octane | Enter price | ||
| LPG | Enter price | ||
| CNG | Enter price |
Common Market Tank Size Guide
Reference table for standard tank sizes with LPG and CNG capacities in all units.
| Tank Size | LPG Fill (L) | LPG Fill (kg) | CNG (kg) | CNG (m³) | Typical Use |
|---|---|---|---|---|---|
| 40L | 32 L | 17.3 kg | 6.8 kg | 8 m³ | Small hatchbacks, compact conversions |
| 50L | 40 L | 21.6 kg | 8.5 kg | 10 m³ | Standard sedans, hybrid retrofits |
| 60L | 48 L | 25.9 kg | 10.2 kg | 12 m³ | Popular size — sedans & crossovers |
| 65L | 52 L | 28.1 kg | 11.1 kg | 13 m³ | Mid-size cars, commercial conversions |
| 70L | 56 L | 30.2 kg | 11.9 kg | 14 m³ | Medium utility vehicles |
| 80L | 64 L | 34.6 kg | 13.6 kg | 16 m³ | SUVs, microbuses, small trucks |
| 90L | 72 L | 38.9 kg | 15.3 kg | 18 m³ | Large vans, pickups |
| 100L | 80 L | 43.2 kg | 17 kg | 20 m³ | Heavy commercial vans, light delivery |
Note: LPG fill calculated at 80% of water volume, density 0.54 kg/L at 15°C. CNG capacity calculated at 0.17 kg/L and 0.20 m³/L at 200 bar fill pressure.
How To Use This Calculator
Worked examples to get accurate results from each calculator section.
LPG Full Tank Refill
- Select LPG Autogas and Liters unit
- Enter 60 as tank size
- Enter ৳80 as fuel price
- Max fill = 60 × 0.80 = 48 L
- Cost = 48 × ৳80 = ৳3,840
LPG Partial Refill
- Select LPG Autogas and Liters
- Tank size: 60L, Current fuel: 15L
- Price: ৳80/L
- Max capacity = 60 × 0.80 = 48 L
- Remaining = 48 − 15 = 33 L
- Cost = 33 × ৳80 = ৳2,640
CNG Full Fill
- Select CNG Gas and kg unit
- Enter 60 as cylinder water volume
- Price: ৳43/kg
- Capacity = 60 × 0.17 = 10.2 kg
- Cost = 10.2 × ৳43 = ৳438.60
Important Notes & Limitations
Critical factors that affect real-world fuel capacity and cost.
Why LPG Is Filled to 80%
LPG is stored as liquid propane/butane. Liquids expand when heated — sometimes by 10–15% in summer. The 20% vapor cushion allows for this thermal expansion without triggering the pressure relief valve, preventing dangerous venting of raw fuel.
Why CNG Capacity Varies
CNG capacity depends on station fill pressure (typically 200 bar but may be lower), ambient temperature (warm gas is less dense), and the gas composition (methane content). A "full" fill at a low-pressure station may deliver only 70–85% of the theoretical weight.
Effects of Temperature
Both fuels are temperature-sensitive. LPG liquid expands in heat (OPD valve compensates). CNG gas stored at fixed pressure weighs less when warm. Expect slight capacity variations between seasons — typically 5–10% difference between summer and winter.
Manufacturer Specs Always Win
The values printed on your cylinder's certification plate — water capacity, test pressure, design pressure, tare weight — always take precedence over any calculator estimate. Consult your installer or manufacturer if specifications are unclear.
Last Reviewed: June 2026
All estimates are based on industry-standard formulas and publicly available fuel data. Actual costs, tank capacities, and savings may vary based on your vehicle, local prices, installer, ambient conditions, and regional regulations. This tool is for educational and planning purposes only.
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