Uve's Electric Vehicle Calculator

Since none of the major auto makers are making freeway-legal EVs any more, doing a conversion is the best way to get what *you* want in an EV!

Vehicle Information

Instructions: Either use the vehicle selector list, or enter the correct values directly for each of the fields below. Gear ratios below should be ratio from wheel to engine, including both transmission and differential. Visitors to the EV Calculator are encouraged to send me info on their own EVs and other known values for any automobile commonly converted, including gear ratios.

Type of Vehicle:

Coefficient of drag:
Frontal area (sq. ft.):
Initial Curb weight:
Drivetrain efficiency:
Gear Ratio (1st):
Gear Ratio (2nd):
Gear Ratio (3rd):
Gear Ratio (4th):
Gear Ratio (5th):
Relative Wind Factor: Note: Relative Wind Factor can be set as high as 1.6

If you need to look up your car's aerodynamic drag, try here:

Coefficient of Drag Tables

Tire size: / R

Revolutions/mile:

Misc Information

Rolling resistance:
Brake and steering drag:
Weight removed:
Total battery voltage:

or
Number of batteries per string:
Number of battery strings:

Electric Components

Instructions: Either use the selector for each field, or enter the correct values directly for each of the fields below.

Motor:

Voltage
Weight
Rated HorsePower
Maximum RPM
Motor a:
Motor b:
Motor c:
Motor d:
Motor k:
Motor n:

If you motor is not found in the drop-down box, the values for a, b, c, d, k, and n can determined here:

Motor Calculations Page

Batteries:

Voltage
Weight
Puekerts exponent
Puekerts Capacity
Internal Resistance Ohms

If your battery is not in the drop-down box, the needed values for Puekert's capacity and Puekert's exponent can be determined here:

Battery Calculations Page

Controller:

Minimum voltage
Maximum voltage
Maximum current
Weight
Efficiency

Charger Weight:

Environmental Conditions

Percent Incline:
Wind:

Vehicle Weight

Instructions: The only field below you can change is the Misc weight. The web page will fill in all the other fields when you click on the calculate button.

Number of Batteries
Battery weight
Charger weight
Controller weight
Motor weight
Misc weight
Weight added
Total vehicle Weight

Drag Calculations

Rolling force (lbs)
Incline Force
Tire Torque multiplier
Total Battery Resistance

speed	10	20	30	40	50	60	70	80	90
Still Air Drag(lbs)
Relative Wind Factor
Relative Wind Drag (lbs)
Total Drag Force (lbs)
Drag torque(ft-lbs)
Required HP

Top Speed

Instructions: Click on the calculate button.

1st gear		Limitation:
2nd gear		Limitation:
3th gear		Limitation:
4th gear		Limitation:
5th gear		Limitation:

Range By Gear And Speed

Results 1st gear Instructions: Click on the calculate button.

speed	10	20	30	40	50	60	70	80	90
Motor Torque(ft-lb)
Motor Rpm
motor amps
motor volts
Battery volts
Battery amps
Range (miles)
Watt-hours per mile

Results 2nd gear Instructions: Click on the calculate button.

speed	10	20	30	40	50	60	70	80	90
Motor Torque(ft-lb)
Motor Rpm
motor amps
motor volts
Battery volts
Battery amps
Range (miles)
Watt-hours per mile

Results 3rd gear Instructions: Click on the calculate button.

speed	10	20	30	40	50	60	70	80	90
Motor Torque(ft-lb)
Motor Rpm
motor amps
motor volts
Battery volts
Battery amps
Range (miles)
Watt-hours per mile

Results 4th gear Instructions: Click on the calculate button.

speed	10	20	30	40	50	60	70	80	90
Motor Torque(ft-lb)
Motor Rpm
motor amps
motor volts
Battery volts
Battery amps
Range (miles)
Watt-hours per mile

Results 5th gear Instructions: Click on the calculate button.

speed	10	20	30	40	50	60	70	80	90
Motor Torque(ft-lb)
Motor Rpm
motor amps
motor volts
Battery volts
Battery amps
Range (miles)
Watt-hours per mile

4QD Company

not only has some nice controllers in the 12 to 48V range, they also have this neat

current and acceleration calculator

but you may need the level driving current from this page.

They also have a

simple road speed calculator

if this one has "too much information" for you!

Engine Weight List

can help you figure out a "glider weight" for your candidate

Car Engine Weights

Thanks to the EV Discussion list