Laundry Detergent Dosage Calculator

Find the right amount of detergent for your laundry loads to avoid waste and ensure clean clothes.

How full is your washing machine?

How dirty are the clothes?

Check your local water report or use a test strip

What type of detergent are you using?

Amount = Base × Load Size × Soil Level × Water Hardness (adjusted for detergent type)
Medium load, normal soil, moderate water with liquid detergent = 2 tablespoons.

How much detergent should I use per load?

Detergent amount depends on load size, soil level, and water hardness. For standard loads in normal conditions, use about 2 tablespoons of liquid detergent or 1/4 cup of powder. Heavily soiled clothes or hard water may require up to 4 tablespoons.

Does water hardness affect detergent usage?

Yes, hard water requires more detergent because minerals bind with soap molecules, reducing cleaning effectiveness. In very hard water areas (over 180 ppm), you may need 25-50% more detergent than recommended.

Can I use too much detergent?

Using too much detergent can leave residue on clothes, cause skin irritation, create excess suds that reduce washing efficiency, and potentially damage your washing machine over time. More detergent does not equal cleaner clothes.

What about HE (High Efficiency) washers?

HE washers require low-sudsing HE detergent and typically use less water, so you need less detergent—usually 1-2 tablespoons per load. Using regular detergent in HE machines can cause oversudsing and poor washability.