HE is an appliance-compatibility question
Detergent choice should match the washer instructions. High-efficiency machines use less water and need products formulated for that system.
More suds do not mean more cleaning
Excessive sudsing can interfere with washing and rinsing. Do not add extra detergent simply because a load is heavily soiled.
Concentration changes the dose
Modern liquids, powders and packets can have different concentrations. Use the product label and its measuring system.
Use the calculator as a range check
WashCareLab can help reason from the product label, load and water conditions, but it should never replace the manufacturer dose instructions with one universal tablespoon rule.
Use product-specific instructions
Garment care labels, appliance manuals and laundry-product directions can be more specific than a general guide. Use them when they set a tighter limit.