The Smart forfour (2004-2006) was offered with 14 distinct engine configurations across its trim range.
| Engine | Power | Torque | Transmission | Drive | Top speed | 0-100 km/h | Consumption | Available on |
|---|---|---|---|---|---|---|---|---|
| 1.5L Petrol | 177 hp | 230 Nm | Manual | Front Wheel Drive | 221 km/h | 6.9 s | 6.8 l/100km | 1 trim |
| 1.5L Petrol | 122 hp | 160 Nm | Automatic | Front Wheel Drive | 195 km/h | 9.5 s | 6.4 l/100km | 1 trim |
| 1.5L Petrol | 122 hp | 160 Nm | Manual | Front Wheel Drive | 195 km/h | 9.5 s | 6.3 l/100km | 1 trim |
| 1.5L Petrol | 109 hp | 145 Nm | Automatic | Front Wheel Drive | 190 km/h | 9.8 s | 5.8 l/100km | 2 trims |
| 1.5L Petrol | 109 hp | 145 Nm | Manual | Front Wheel Drive | 190 km/h | 9.8 s | 6.1 l/100km | 2 trims |
| 1.5L Diesel | 95 hp | 210 Nm | Automatic | Front Wheel Drive | 180 km/h | 10.5 s | 4.6 l/100km | 3 trims |
| 1.5L Diesel | 95 hp | 210 Nm | Manual | Front Wheel Drive | 180 km/h | 10.5 s | 4.6 l/100km | 3 trims |
| 1.3L Petrol | 95 hp | 125 Nm | Automatic | Front Wheel Drive | 180 km/h | 10.8 s | 5.6 l/100km | 3 trims |
| 1.3L Petrol | 95 hp | 125 Nm | Manual | Front Wheel Drive | 180 km/h | 10.8 s | 5.8 l/100km | 3 trims |
| 1.1L Petrol | 75 hp | 100 Nm | Automatic | Front Wheel Drive | 165 km/h | 13.4 s | 5.3 l/100km | 3 trims |
| 1.1L Petrol | 75 hp | 100 Nm | Manual | Front Wheel Drive | 165 km/h | 13.4 s | 5.5 l/100km | 4 trims |
| 1.5L Diesel | 68 hp | 160 Nm | Automatic | Front Wheel Drive | 160 km/h | 13.9 s | 4.6 l/100km | 3 trims |
| 1.5L Diesel | 68 hp | 160 Nm | Manual | Front Wheel Drive | 160 km/h | 13.9 s | 4.6 l/100km | 4 trims |
| 1.1L Petrol | 64 hp | 92 Nm | Manual | Front Wheel Drive | 158 km/h | 15.3 s | 5.4 l/100km | 2 trims |
Each row is a distinct mechanical configuration — engine size, power output, transmission, drivetrain and fuel type — deduplicated across equipment trims that share the same engine. Trim-only differences (interior, wheels, options) do not create a separate row.