Laundry Detergent Dosage Calculator

More on detergents and softeners: Laundry detergents and softeners — How much to use, pods and powder, fabric softener, and what not to mix.

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There is no single ounce number that fits every detergent. The American Cleaning Institute says to use the amount on the label, and that too much or too little detergent can leave clothes less clean. This calculator starts from your label — or from Tide’s published directions as a worked example — and then applies the load-size, soil, hardness, and HE guidance those sources actually give, without inventing a hidden formula.

Last updated: November 13, 2026.

Use it as a planning tool, then confirm the lines on the bottle, box, or pac package you own. For the longer written explanation, see how many ounces of laundry detergent to use per load. Related guides sit in laundry detergents and softeners.

How this calculator works

The tool does not invent a universal ounce chart. It asks for the medium-load amount on your package, or it can use Tide’s published cap bars as an example. It then maps load size this way:

For Tide liquid cap bars, it uses Tide’s own lines: bar 1 for a medium load, bar 3 for a large load, and bar 5 for a full HE load. For a small load, it does not guess a bar number; it tells you to use the small-load line on your bottle, which is less than the medium fill.
For other liquids and powders, it reports the medium amount you entered for a medium load, and it tells you to use your package’s large or full-HE line rather than multiplying by a factor we do not have from the maker.
For pacs, it uses Tide’s published rule of thumb: one Tide POD for a smaller load, two for a standard load, and three for a larger load, placed in the empty drum, not in the dispenser.

Tide also says dosage depends on how dirty the clothes are, the size of the load, and water hardness, and that people in hard-water areas need more detergent. The Cleaning Institute says to add slightly more than the label in hard water, or to add a water softener or detergent booster. Neither source publishes one percentage that fits every product, so this calculator does not automatically add 10 or 20 percent. It flags hard water and heavy soil and points you back to the label and to that “slightly more” advice.

HE machines are handled the same way ACI describes: choose an HE detergent, then dose for the load, not for the water level. A full HE load can actually need more product because the drum holds more laundry. That is why Tide’s liquid example uses a higher cap fill (bar 5) for a full HE load. For HE versus regular detergent, see using high-efficiency detergent in a regular washer and using powder in a front-load washer.

If you want a second check, look at the cap or scoop in your hand, not at a memory of an old bottle. Ultra concentrates use less product than older, unconcentrated formulas, which is why the Cleaning Institute says to measure with the cap or scoop that came with the detergent you are using now. Our laundry cost calculator can then turn that dose into a cost per load if you enter what you pay for detergent.

Frequently asked questions

Why doesn’t this give one number in ounces?

Caps and scoops are not all the same size, and many labels use bars or lines rather than fluid ounces. The honest answer is the line on your package, adjusted the way ACI and the maker describe.

Should I use less detergent in an HE washer?

Not because the machine uses less water. ACI says the dose depends on load size and soil. Use HE detergent, and follow the HE or full-load line when the drum is full.

How much extra should I add for hard water?

ACI says “slightly more” than the label, or use a softener or booster. Tide says hard-water areas need more detergent. This tool will not invent a precise extra amount.

Where do pacs go?

Tide says to put Tide PODS in the empty drum, then add the clothes, and to store the box away from children and pets. Do not put them in a regular detergent drawer.