With Ratio Rite measuring cup get a perfect mix every time;Fill to the pre-calibrated ratio mark and pour into gas;Ratios are from 161 to 441 for 1, 1-12, 2, and 2-12 gallons;Calibrations also include oz., c.c.s, and pints on the opposite side for transmission oil, fork oil, etc;Total capacity is 24 oz.