How to Use the Detergent Dose Calculator
Eyeballing the detergent cap line every wash tends to run either too heavy or too light. Overdosing leaves residue on fabric that fails to rinse out fully, while underdosing means stains and odors don't fully lift.
This calculator sets a base dose from your laundry weight, then adjusts it for soil level and water hardness. Choose "Heavy" for sweaty or stained loads, and "Hard water" if your water feels mineral-heavy — both increase the dose so the detergent still sudses effectively.
Fabric softener works well at a smaller volume than detergent, so it uses roughly half the base rate. Compare the result against the fill lines on your dispenser drawer if your washer has an auto-dispense compartment, and adjust for liquid vs. concentrated pod formulas as needed.
Frequently Asked Questions
Excess detergent doesn't rinse out fully, leaving residue that can irritate skin, and it builds up as gunk inside the washer that causes odors and mold. Sticking to the right dose helps both cleaning performance and machine upkeep.
Check your local water utility's annual water quality report, or use an inexpensive test strip. If you're unsure, calculate with soft water settings first — if you notice weak suds, treat your water as hard and add a bit more.