Compare against other fuels (annual cost over — km/year)
Your car
How much you drive
The Math
Per-km cost: fuel price ÷ mileage. So a petrol car at ₹96/L and 15 kmpl costs ₹6.40/km.
Annual cost: (annual km ÷ mileage) × fuel price. The same equation works for diesel (km/L), CNG (km/kg), and EV (km/kWh) — just match unit to fuel type.
EV blended cost: home% × home rate + (1 − home%) × public rate. Home AC charging is roughly ₹8/kWh; public DC fast-charging is ₹15-25/kWh. The blend matters more than people realize — if you're a 100%-public-charging EV driver, your per-km cost can match a CNG car.
Comparison: we compute each fuel's annual cost at YOUR annual km, using each fuel's typical mileage (editable defaults shown). The "vs current" column subtracts to show what you'd save (positive) or lose (negative) by switching.
Frequently asked
What fuel prices does this use?
Indicative May 2026 defaults: petrol ₹96/L, diesel ₹89/L, CNG ₹76/kg, home electricity ₹8/kWh, public DC fast-charge ₹20/kWh. All editable. Real prices vary daily and by city — Delhi/Mumbai/Bengaluru differ ₹2-5/L from the all-India average.
What mileage should I use?
Use your own real-world mileage if you know it (trip computer reading averaged over 1000+ km). Otherwise: petrol hatchback ~15-18 kmpl, diesel sedan ~18-22 kmpl, CNG hatchback ~22-26 km/kg, EV city driving ~6-8 km/kWh. ARAI-claimed mileage is usually 20-30% higher than what you actually get — see /explain/arai-mileage-vs-real-world-mileage.
How does the EV public-charging slider work?
EV per-km cost depends heavily on where you charge. Home AC charging is cheap (~₹8/kWh = ₹1.3/km on a typical EV). Public DC fast-charging is 2-3× more expensive (~₹20/kWh = ₹3.3/km). The slider blends them: 100% home means you only ever charge at your residence; 0% means you always use public chargers (rare). The blended rate matches your real spending.
How do I read the comparison?
The right-hand "Compare against" panel shows your CURRENT fuel's cost minus an alternate fuel's cost over the same kilometres. Positive = the alternate fuel is CHEAPER (you would save by switching). Negative = your current fuel is already cheaper. The 5-year column compounds for a holding-period view.
Does this include the cost of switching fuels?
No. Switching fuels usually means buying a new car — that decision needs the full Total Cost of Ownership view (purchase + insurance + maintenance + depreciation), not just running cost. Use /calc/tco or /calc/ev-vs-ice for the full comparison. This calculator answers a narrower question: "given I already own a car, what does running it cost me, and what would running a different fuel cost?"
Can I share my numbers?
Yes — every input is in the URL. Copy the address bar.