FPV Drone Motor KV Calculator
Find the right motor KV rating and size for your FPV drone based on frame size, battery cell count, and flying style.
Recommended Motor KV Range
KV rating in drone motors stands for RPM per Volt — NOT kilovolts. A motor rated at 2300KV spinning on a 4S battery (16.8V) will spin at approximately 2300 × 16.8 = 38,640 RPM with no load.
Battery cell counts and voltages:
| Cell Count | Nominal Voltage | Max Voltage | Common Name |
|---|---|---|---|
| 2S | 7.4V | 8.4V | 2-cell LiPo |
| 3S | 11.1V | 12.6V | 3-cell LiPo |
| 4S | 14.8V | 16.8V | 4-cell LiPo |
| 6S | 22.2V | 25.2V | 6-cell LiPo |
Higher voltage = more efficiency because you can use a lower KV motor that turns a larger, slower prop for more efficient thrust.
Frame size and motor selection guide:
| Frame Size | Prop Size | Typical Use | Recommended KV (4S) |
|---|---|---|---|
| 1.5" (toothpick) | 1.5–2" | Indoor / tiny | 8,000–12,000 KV |
| 2.5" (tiny whoop) | 2.5" | Indoor / beginner | 5,000–8,000 KV |
| 3" | 3" | Park / freestyle | 2,800–4,500 KV |
| 5" (standard) | 5" | Freestyle / racing | 1,700–2,500 KV |
| 7" | 7" | Long range | 1,200–1,800 KV |
| 10" | 10" | Cinematics | 800–1,200 KV |
KV vs flying style:
- Racing: Higher KV for explosive acceleration and top speed
- Freestyle: Mid-range KV for a balance of power and control
- Long range / cinematic: Lower KV, larger props, better efficiency and flight time
Motor size notation (e.g. 2306):
- First 2 digits = stator diameter in mm
- Last 2 digits = stator height in mm
- Larger stator = more power and torque
| Frame Size | Typical Motor Size |
|---|---|
| 3" | 1204–1408 |
| 5" | 2205–2306 |
| 7" | 2806–3115 |
| 10" | 4108–5010 |
ESC current rating:
Your ESC should be rated for at least 20–30% more than the motor’s peak current draw. A typical 5" 4S freestyle setup draws 30–40A per motor — use 40–50A ESCs.