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Trip Cost Calculator
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Fuel Cost Calculator
Estimate how much fuel you need and what it will cost for any trip. Works for petrol, diesel, octane, and CNG vehicles. Enter your fuel price, distance, and mileage — no signup required. No account needed — numbers update as you type.
Results are estimates based on your inputs. Actual fuel consumption varies with traffic, driving style, AC use, vehicle load, and road gradient. Last reviewed: May 2026.
Step By Step
How to Use This Calculator
5 steps
- Enter the current fuel price per litre (or per m³ for CNG) in your chosen currency.
- Enter the total distance of your trip in kilometres or miles.
- Enter your vehicle's fuel efficiency — km/L for metric, mpg for imperial.
- Review the estimated litres needed and total fuel cost instantly.
- Adjust values to compare petrol vs CNG costs for the same route.
Worked Example
Example: Dhaka to Chittagong by car
Use this sample to sanity-check your inputs and understand what the final result represents.
- 1Fuel type: Octane · Price: BDT 127/L (BPC regulated, Jan 2025)
- 2Distance: 244 km (Dhaka–Chittagong highway)
- 3Vehicle: Toyota Axio · Efficiency: 16 km/L (highway)
- 4Fuel needed: 244 ÷ 16 = 15.25 L
Final Result
Estimated fuel cost: 15.25 × BDT 127 = BDT 1,937 one way.
Methodology
Formula Used
This section explains the calculation logic, assumptions, and source material used to make the result more trustworthy and easier to verify.
Fuel needed (L) = Distance (km) ÷ Fuel Efficiency (km/L). Total fuel cost = Fuel needed × Fuel price per litre. For imperial: Fuel needed (gallons) = Distance (miles) ÷ MPG. For CNG: enter price per cubic metre and efficiency in km/m³. The formula is the standard used in automotive fuel economy calculations worldwide (ISO 8714, SAE J1498).
Practical Guidance
Tips to Reduce Fuel Cost in Bangladesh
- 1Keep tyre pressure at the manufacturer's recommended PSI — under-inflated tyres increase fuel use by 3–5% per 10 PSI deficit
- 2On Dhaka city roads, switch off the engine if stationary for more than 60 seconds — idling a 1,500cc engine burns roughly 0.5–0.8 L/hour
- 3Use the AC on highways and open windows in slow city traffic — AC adds 10–15% to fuel consumption at highway speed
- 4Service your air filter every 15,000 km — a clogged filter alone can cut fuel efficiency by 10%
- 5Consider CNG conversion for high-mileage vehicles: CNG costs BDT 43/m³ vs BDT 110–127/L for petrol, saving 60–70% on fuel cost per km for suitable engines
- 6Drive at 80–90 km/h on highways — most petrol cars achieve peak fuel efficiency in this range, dropping significantly above 100 km/h
Frequently Asked Questions
What is the formula for calculating fuel cost?+
Fuel needed (litres) = Distance (km) ÷ Fuel Efficiency (km/L). Total cost = Fuel needed × Fuel price per litre. For example: 200 km trip in a car doing 14 km/L with petrol at BDT 110/L needs 200 ÷ 14 = 14.3 L, costing 14.3 × 110 = BDT 1,571.
What are the current fuel prices in Bangladesh?+
As of January 2025 (BPC regulated rates): Octane — BDT 127/L, Petrol — BDT 110/L, Diesel — BDT 89/L, Kerosene — BDT 89/L, Furnace oil — BDT 77/L. CNG for auto-rickshaws — BDT 43/m³ (Petrobangla regulated). Fuel prices are set by the government and revised periodically — always check the current BPC notice before a long trip.
What is a realistic fuel efficiency for common vehicles in Bangladesh?+
Typical highway figures: motorcycle 35–50 km/L, small car (Suzuki Alto, Vitz) 16–20 km/L, mid-size car (Toyota Axio, Allion) 13–17 km/L, microbus (Toyota Hiace) 9–12 km/L, truck 5–8 km/L. City figures are 20–30% lower due to traffic. CNG auto-rickshaws typically do 20–25 km/m³.
How does CNG compare to petrol cost per km?+
At current rates (petrol BDT 110/L, CNG BDT 43/m³): a car doing 14 km/L on petrol costs 110 ÷ 14 = BDT 7.86/km. The same car on CNG doing 12 km/m³ costs 43 ÷ 12 = BDT 3.58/km — saving about 55% per km. CNG conversion costs BDT 40,000–70,000 and typically pays back within 1–2 years for high-mileage vehicles.
Why does my actual fuel cost differ from the estimate?+
The calculator uses your stated efficiency as a constant. Real-world consumption varies with: traffic and stop-and-go driving (can cut efficiency 25–40%), AC use (+10–15%), vehicle load, road gradient, tyre condition, engine health, and driving speed. For city driving in Dhaka, reduce your highway km/L figure by 25–30% for a more accurate estimate.
Can I use this calculator for diesel trucks and motorbikes?+
Yes — the formula is the same for any vehicle. Enter the correct fuel price per litre for diesel (BDT 89/L in Bangladesh) and your vehicle's actual efficiency. For a Hino truck doing 6 km/L on a 300 km route: 300 ÷ 6 = 50 L × BDT 89 = BDT 4,450 in diesel.
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