Home Equipment Weed Eater / String Trimmer Fuel Mix

Weed Eater / String Trimmer Fuel Mix Calculator

Quick Answer Most modern string trimmers and weed eaters use a 50:1 fuel mix ratio (2.6 fl oz of oil per gallon of gas). Some older or commercial models may use 40:1.

Weed Eater / String Trimmer Calculator

Fuel Amount

Oil Mix Ratio

50:1

40:1

32:1

25:1

Custom Ratio: :1

Oil Needed

You Need

2.6

fl oz

for 1 gallon at 50:1 ratio

Milliliters

US Fluid Ounces

2.6

Liters

0.077

Weed Eater / String Trimmer Equipment Types

String Trimmers / Weed Eaters (all brands)
Brush Cutters
Line Trimmers
Grass Trimmers
Edgers with 2-stroke engines

Recommended Oil for Weed Eater / String Trimmer

High-quality 2-stroke oil meeting JASO FD or ISO-L-EGD standards. Brand-specific oils (Stihl HP Ultra, Husqvarna XP+, Echo Power Blend) are all excellent.

→ Complete Oil Selection Guide

Always Check Your Owner's Manual

Using the wrong fuel ratio can damage your engine. Commercial-grade trimmers and brush cutters typically use 50:1. Always check your specific model's manual.