RC Runtime Bench

RC Runtime Bench is an offline engineering calculator for estimating how long RC models and other battery-powered setups will run.

Build complete power-system profiles with battery capacity, cell count, voltage, C-rating, motor current, average load, auxiliary draw, usable capacity, efficiency and calibration. Get live estimates for runtime, average current and power before you commit to a build.

Key features:
• Create, edit, duplicate, favorite, search, sort and filter projects
• Live runtime, current and power estimates with input validation and safety warnings
• Compare up to four configurations with a clear runtime chart
• Log real flight/run measurements and auto-calibrate from the latest ten valid tests
• Export and import local JSON backups through the system file picker
• Fully offline: no account, no ads, no analytics, no internet permission

Designed for hobbyists and builders who want fast, repeatable estimates and a simple way to refine them with real data. Critical high-current setups should still be verified with instrumentation.