Tools

Tools and calculators for FPV

A collection of different tools, calculators, and other useful things for FPV that wouldn’t fit anywhere else.

Motor Size Calculator

Stator Size:

Volume: mm³

Surface Area: mm²

The motor stator size is listed as XXYY/XXYY.Y, with xx being the width, and yy being the height. A 2207 motor will have a stator 22mm wide, and 7mm high

The formulas for the volume and surface area of a cylinder are:

V = \pi \left(\frac{d}{2}\right)^2 h \qquad A = \pi d\left(\frac{d}{2} + h\right)

An advanced calculator for comparisons is here

Power Conversion

mW = dBm

dBm is a unit of power measurement. It is a logarithmic unit (unlike Watts), and is used to compare the power of different signals.

The relationship between dBm and mW is as follows:

\text{mW} = 10^{\frac{\text{dBm}}{10}}, \quad \text{dBm} = 10 \cdot \log_{10}(\text{mW})

Battery Wh Calculator

LiPo LiHV Li-ion LiFePO4

Capacity: mAh Cell Count:

Energy: N/A Wh

Wh [watt-hour] is a measure of energy. It denotes the amount of power (in watts) consumed over a period of time (in hours). It can be used to compare the energy capacity of different batteries when they differ in cell count, chemistry, or capacity.

Wh = \frac{V \times mAh}{1000} \qquad V = V_{nominal} \times N_{cells}