EVKX Range & Travel Calculator

The EVKX Range & Travel Calculator turns vehicle data and explicit assumptions into comparable range and journey scenarios. It estimates what may happen at a chosen speed and set of conditions; it is not a navigation system or a promise that a trip will unfold exactly as calculated.

What the calculator answers

The calculator has three modes:

Range: estimates single-charge distance for 100–0%, 100–10% or 80–10% state-of-charge windows.
Distance: estimates energy use, driving time, charging time, charging stops and total travel time for a chosen distance.
Time: estimates how far the vehicle can travel within a time budget that includes driving and charging.

You can compare several vehicles or battery versions in the same scenario. Metric and imperial units change how values are entered and displayed, not the underlying calculation.

How the consumption model works

At its simplest, the model separates the energy demand into components:

estimated consumption = aerodynamic demand + drivetrain and rolling demand + auxiliary load + HVAC load + topography

Aerodynamic demand rises approximately with the square of speed. It is based on air density, drag coefficient and frontal area. Drivetrain and rolling demand depends on vehicle mass, tyres, road condition and calibrated efficiency. Auxiliary and HVAC loads are power demands, so their energy per kilometre is especially important at low speed. Climbing adds energy demand; descending can recover part of it through regenerative braking.

EVKX first uses the vehicle's physical data, including mass, drag coefficient, frontal area and tyre configuration. Where enough suitable consumption measurements exist, the model fits its parameters to those observations. Otherwise, it uses available WLTP and steady-speed consumption anchors, such as 90 km/h and 120 km/h values. If vehicle-specific data is incomplete, conservative physics defaults fill the remaining gaps.

This hierarchy matters. A richly measured vehicle can be calibrated more closely than one with only a certified value, but every result remains an estimate.

Inputs and what they change

Speed strongly changes aerodynamic demand. The calculator currently treats the selected speed as constant.
Temperature changes dry-air density. It does not automatically estimate cabin heating, cooling or cold-battery losses.
HVAC power is a separate manual load from 0 to 5 kW. Choose a value that represents the expected cabin and thermal-system demand.
Road condition applies a rolling-resistance multiplier for dry, damp, wet, very wet or snowy surfaces.
Battery state of health reduces the usable capacity to represent ageing.
Heat-loss factor applies an additional capacity reduction for the scenario. It is entered as a fraction: 0.20 means a 20% reduction. Avoid using it to count a loss already represented by battery state of health.
Trim can change wheels, tyres, mass and aerodynamic inputs where EVKX has trim-specific data.
Trailer presets add trailer mass, rolling resistance, aerodynamic area and auxiliary demand.
Topography is available in Distance mode. The current model uses the entered total climb and descent rather than a detailed elevation profile.

The selected starting and ending state of charge define how much of the adjusted battery capacity is available. A result for 100–0% is therefore intentionally different from a trip planned around a narrower charging window.

Charging and travel time

For Distance and Time modes, EVKX combines driving consumption with the vehicle's charging curve. The optimizer tests charging strategies and state-of-charge windows to find a low total travel time for the scenario.

The current travel-time model includes a fixed five-minute overhead for each charging stop. It also applies a 7% reduction to the stored charge-power curve to account for charging losses in the time calculation. These are modelling assumptions, not measurements of a specific charging site.

Charging stops in the result are mathematical intervals along the journey. The core calculation assumes that suitable chargers are available when needed; it does not select stations or know whether a charger is occupied, broken, power-limited or compatible with a payment account.

Reading the results

The summary shows the values relevant to the selected mode, such as range, distance, energy use, average consumption, travel time and charging stops. Expand the consumption breakdown to see the estimated contribution from:

drivetrain and rolling demand;
aerodynamic demand;
auxiliary systems;
HVAC;
additional road-condition resistance;
trailer effects; and
topography, when used.

The interface may label aerodynamic demand as wind resistance. This is the vehicle's drag through still air at the selected speed; the current calculator does not model a separate headwind or tailwind.

Distance and Time results also include a travel log showing the modelled driving and charging segments. Read it as the consequence of the chosen assumptions, not as a turn-by-turn itinerary.

What the model does not know

The calculator does not currently model live traffic, changing speed, a detailed route elevation trace, automatic HVAC behaviour, battery temperature, precipitation, or a separate wind speed and direction. It also does not know real-time charger location, availability, queues, shared-site power, reliability or pricing.

Loads such as extra passengers, roof boxes, bicycles, open windows and unusual tyre pressures are only represented if they are already embedded in a vehicle input or you approximate their effect with the available controls.

In Distance mode, an optional ABRP comparison can provide a third-party route-planning result when that panel is loaded. It is separate from the EVKX physics calculation and does not turn the core result into live navigation.

Use it with the range guide

For the underlying relationship between usable energy, consumption, certification cycles, road load, weather and the dashboard range estimate, see Understanding EV Range. The range guide explains why a certified number, an EVKX scenario and the vehicle's own estimate can all differ without any of them being a fixed promise.

Open the calculator

Open the EVKX Range & Travel Calculator and choose a vehicle, a mode and the conditions you want to compare.