Free Interactive EV Engineering Tools
Industry-grade calculators used by EV engineers, students and retrofitters — including the new 2-Wheeler EV Retrofitting Engineering Calculator
2-Wheeler EV Retrofitting Engineering Calculator
Road-load physics → motor & drivetrain → battery pack → components → BOM & cost. Deterministic formulas, no AI guesses.
Incl. motor & battery
90/90-12 ≈ 0.25 · 2.75-18 ≈ 0.30
Tarmac 0.010–0.020
Scooter + rider 0.5–0.8
Overall, 0–1
0–1
0–1
0–1
0–1 (DoD, reserve)
| Parameter | Cruise (flat) | Design point | Unit | Type |
|---|---|---|---|---|
Vehicle speed v = km/h ÷ 3.6 | 16.667 | 16.667 | m/s | CALCULATED |
Gradient angle θ θ = atan(G/100) | 0.000 | 2.862 | ° | CALCULATED |
Rolling resistance force Crr·m·g·cosθ | 26.49 | 26.45 | N | CALCULATED |
Aerodynamic drag force ½ρ·CdA·v² | 100.00 | 100.00 | N | CALCULATED |
Gradient force m·g·sinθ | 0.00 | 88.18 | N | CALCULATED |
Acceleration force m·a | 0.00 | 0.00 | N | CALCULATED |
Total tractive force Sum of forces | 126.49 | 214.63 | N | CALCULATED |
Wheel torque F·r | 35.42 | 60.10 | Nm | CALCULATED |
Wheel speed v/(2πr)·60 | 568.4 | 568.4 | rpm | CALCULATED |
Wheel power F·v | 2.108 | 3.577 | kW | CALCULATED |
Motor shaft power P_wheel / η_drivetrain | 2.480 | 4.209 | kW | CALCULATED |
Battery (electrical) power P_shaft / (η_motor·η_ctrl) | 2.906 | 4.930 | kW | CALCULATED |
| Parameter | Value | Unit | Type |
|---|---|---|---|
Vehicle mass (after conversion) | 110.0 | kg | ASSUMED |
Rider mass | 70.0 | kg | ASSUMED |
Payload / pillion | 0.0 | kg | ASSUMED |
Total mass Sum of masses | 180.0 | kg | CALCULATED |
Target speed | 60.0 | km/h | ASSUMED |
Target range | 60.0 | km | ASSUMED |
Wheel radius (loaded) | 0.280 | m | ASSUMED |
Road gradient (design point) | 5.0 | % | ASSUMED |
Acceleration (design point) | 0.00 | m/s² | ASSUMED |
Rolling resistance coefficient Crr | 0.0150 | – | ASSUMED |
Aerodynamic drag area CdA | 0.600 | m² | ASSUMED |
Air density ρ | 1.200 | kg/m³ | ASSUMED |
Educational engineering estimate. Results are calculated with deterministic formulas and are not a certification of safety or road-legality. Retrofitting for road use in India requires a type-approved kit (AIS-123), homologation and RTO endorsement. High-voltage (> 60 V DC) work must be done by trained personnel. Verified against 6 EVGURU reference cases.