Gas and Oil Mix Calculator

The Gas and Oil Mix Calculator is part of the RC General Calculator tool set. It is useful for RC hobbyists who run gas or nitro support equipment, gas boats, gas airplanes, or other small-engine models and want a quick way to calculate oil amounts.

What this calculator does

It also includes simple electric runtime math for estimating average current draw and usable battery time. Gas and oil ratios can be confusing because some people think in 25:1 or 40:1 ratios while others prefer oil percentage. This calculator supports both approaches and helps reduce measuring mistakes. Enter the fuel amount and either the ratio or oil percentage, then review the oil amount required. For battery runtime, enter capacity, usable percentage, and average current. Example: for a 5% oil mix, the calculator treats the oil as a percentage of the finished mixture so the measured oil amount matches the intended final fuel blend. Use this as a practical shop utility before mixing fuel or planning simple runtime.

In practical terms: It calculates fuel oil amounts from ratio or percentage and provides simple electric runtime estimates.

How to use it

Enter the fuel amount and either gas-oil ratio or oil percentage. For runtime, enter battery capacity and expected average current.

Example calculation

Calculate the oil needed for 10 liters of finished fuel at 5%, or estimate runtime from a 5000mAh pack at 25A average draw.