What Size Trolling Motor Do I Need?
Start with loaded weight, mounting location and water conditions. Boat length helps choose a generic profile, but it cannot tell you how much weight the motor must control. Include passengers, fuel, batteries and gear in the input.
Updated 10/11/2026 · ai assisted
The decision to make
Start with loaded weight, mounting location and water conditions. Boat length helps choose a generic profile, but it cannot tell you how much weight the motor must control. Include passengers, fuel, batteries and gear in the input.
What the calculation can establish
Use minimum thrust as a starting requirement, then compare available tiers. The engine adds condition allowances and checks shaft options, environment and mount. An oversized motor can demand a different battery system without solving an unsuitable mounting point.
| Input | Why it changes the decision |
|---|---|
| Loaded weight | Drives the thrust estimate |
| Mount and waterline measurement | Drive the shaft requirement |
| Wind/current conditions | Change the condition allowance |
| Water environment | Excludes unsuitable motor models |
Try the calculation with your setup
Your setup starts here
Tell us about your boat to see thrust, shaft guidance and matching motors.
Verified product examples
| Configuration | Thrust / capacity | Voltage | Shaft / current | Mount / chemistry | GPS |
|---|---|---|---|---|---|
| Minn Kota Edge 45 lb — 45-inch shaft | 45 lb | 12 V | 45 in | BOW | Unknown / not verified |
| Minn Kota Endura 30 lb — 30-inch shaft | 30 lb | 12 V | 30 in | TRANSOM | Unknown / not verified |
| Minn Kota Endura 40 lb — 36-inch shaft | 40 lb | 12 V | 36 in | TRANSOM | Unknown / not verified |
| Minn Kota Endura 50 lb — 36-inch shaft | 50 lb | 12 V | 36 in | TRANSOM | Unknown / not verified |
| Minn Kota Endura Max 45 lb — 36-inch shaft | 45 lb | 12 V | 36 in | TRANSOM | Unknown / not verified |
Questions to resolve before buying
Can I use this example as an installation approval?
No. Run the tools with your exact models and measurements, then confirm the operating range, wiring, protection and bank permissions with the manufacturers.
What if the calculator returns unknown or no match?
Supply missing evidence or measurements. Do not turn an unknown field into a yes, and do not choose an undersized product just because it is the only item shown.