Free Tools & Calculators
Free, fast tools from RccarHQ. Every tool runs right in your browser: free, no sign-up, nothing to install, and nothing you type is sent anywhere. Tap “Use it here” to try one on this page, or open its full page for the guide.
Basher Motor, ESC & LiPo S-Count Matcher
Compare your motor kV, ESC max S and LiPo cell count from your own spec sheets and see the theoretical no-load RPM (kV × S × 3.7).
LiPo Charge Time & Charger Wattage Checker
Estimate how long a LiPo pack takes to charge and check whether your charger's watts and amps cover the charge current you enter.
Nitro Fuel Runtime & Cost Calculator
Enter your tank size, timed minutes per tank, sessions and fuel price to estimate nitro fuel used and its cost per session and per month.
RC Apps & Software Finder
Filter RC phone control apps, ESC/radio programming software and design tools by purpose, platform, price and brand, with official links.
RC Battery Runtime & Voltage Calculator
Get LiPo or NiMH pack voltage (nominal and full), estimated runtime and C-rating current from cells, mAh, C and average amp draw.
RC Car Gear Ratio & Top Speed Calculator
Work out final drive ratio, rollout, wheel rpm and theoretical no-load top speed from your motor KV, battery, gearing and tire size.
RC Truck Scale Size Converter
Convert a real truck's length, width and height to any RC scale from 1/6 to 1/24, or find the scale implied by a model's length.
Tire Swap Speed & Gearing Compensator
Enter motor KV, cells, gearing and old vs new tire diameter to see the theoretical no-load speed change and rollout from a tire swap.