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EV Efficiency Calculator
x402
EV Efficiency Calculator is a paid API for AI agents from automotive-calc.x402tookit.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-29).
Converts an EV efficiency figure between units and computes range, annual energy cost, and savings versus a gas car.
Price / call$0.02
Success—
StatusUnknown
How this service works
EV efficiency in kWh per 100 miles, miles per kWh, Wh per km and MPGe, range from battery size, and cost versus a gas car.
Output
Returns the input efficiency expressed in all five unit formats (kWh/100mi, mi/kWh, Wh/km, kWh/100km, MPGe), estimated range in miles and km if battery size is provided, annual kWh consumed, annual electricity cost, cost per mile, and — if gas car details are supplied — the gas car's annual cost, gas cost per mile, and annual savings versus gas. Also includes a human-readable summary and disclaimer.
Example use cases
EV vs gas car cost comparison
“I drive 15,000 miles a year and I'm deciding between an EV that gets 3.8 mi/kWh and my current car that does 28 MPG — electricity is $0.14 per kWh and gas is $3.60 a gallon, can you tell me the annual cost difference and savings?”
Range estimate from battery size
“My EV has a 64 kWh usable battery and an efficiency of 250 Wh per km — how many miles and km of range do I get on a full charge, and what is that in MPGe?”
Convert efficiency units for spec sheet
“I need to convert 6.3 kWh per 100 km into all the other EV efficiency units — miles per kWh, Wh per km, kWh per 100 miles, and MPGe — so I can compare it against US-spec vehicles.”
Technical details
Endpoint
GEThttps://automotive-calc.x402tookit.com/ev-efficiency?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to convert an EV efficiency figure between any combination of kWh/100mi, mi/kWh, Wh/km, kWh/100km, and MPGe, or when you want to compute range from battery capacity, or when you need a cost-vs-gas comparison — all in a single call. Prefer it over manual calculation whenever multiple output units or cost comparisons are needed simultaneously.
Side effects
- Missing required 'efficiency' or 'unit' query parameters returns an error
- Invalid unit string (not one of the five accepted enum values) causes a validation error
- Nonsensical efficiency values (e.g. zero or negative) may return null or degenerate outputs
- If batteryKwh is omitted, range fields will be null
- If gasMpg is omitted, gas-comparison fields will be null
- Payment not provided or insufficient USDC causes a 402 Payment Required response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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