Free, precision engineering tools for UAV builders. Calculate thrust-to-weight ratios, model flight time, size batteries and ESCs, analyse RF link budgets — all in one place. URL-shareable with metric/imperial support.
Thrust, motor, prop, and weight calculations
Thrust-to-Weight Ratio
Calculate thrust-to-weight ratio, hover throttle, and max tilt angle for any multirotor drone.
Motor / Prop Matching
Find optimal propeller size for your motor KV and battery voltage. Estimates thrust, power, and efficiency.
Battery sizing, flight time, ESC, and power budgets
Flight Time Estimator
Estimate hover and cruise flight time from battery capacity, weight, and current draw.
Battery Sizing
Calculate required battery capacity, C-rating, and weight for your target flight time and power needs.
ESC Sizing
Calculate required ESC current rating, wire gauge, and voltage drop for your motor and battery configuration.
Radio link budget, antenna gain, and signal margins
RF Link Budget
Calculate free space path loss, received signal strength, link margin, and maximum range for drone radio links.
Antenna Calculator
Calculate physical dimensions for dipole, monopole, patch, and helical antennas at common drone frequencies.
Frame, arm, and structural load analysis
Frame Load
Structural load analysis per arm
Coming SoonRF link budget, antenna gain, structural load, and advanced motor/prop matching tools are in development.