2026-09-02
Laundry Cost Per Load: Include Water, Energy, Detergent, and Rewashes
Quick answer: Measure laundry by completed loads, including water, electricity or gas, detergent, drying, and the cost of loads that must be rewashed.
Collect the inputs that change the result
Record washer and dryer energy, water and sewer charges, detergent and softener, laundromat or delivery fees, equipment purchase and expected loads, repair reserve, drying method, load size, loads completed, and rewashes. Keep washer and dryer costs separate when comparing options.
Formula and worked example
effective cost per completed load = (water + sewer + washer energy + dryer energy + detergent + allocated equipment and repair cost + rewash cost) ÷ completed loads. Over a month, water and sewer cost 9, energy costs 7, detergent costs 8, and allocated equipment and repair cost is 6. If 40 loads are completed and two are rewashes costing 1 total, the effective cost is 31 ÷ 40 = $0.78 per completed load.
Use a range instead of a promise
Compare small, ordinary, and full loads; air-drying and machine-drying; and a month with missed or repeated loads. A high-capacity machine is not automatically cheaper if loads are rarely full. Keep stain-removal time, convenience, and fabric-care needs as separate judgments rather than assigning them an invented dollar value.
ENERGY STAR reports that certified full-sized clothes washers use less water per load than standard machines, but a product efficiency claim is not your household cost. Use your own utility rates, load size, drying method, and actual cycle count. Do not divide by the washer capacity or advertised annual savings; divide by completed loads you actually run.
Common mistakes and related guides
For other real-use denominators, compare the home internet cost guide, electricity cost guide, and water bill cost guide. The annual cost guide and recurring costs guide help place recurring laundry spending in cash flow.
Record consumed resources and equipment allocation separately so you can see whether cost rises from water, energy, detergent, drying, or underfilled loads. Put special-care clothes in a separate scenario so they do not distort ordinary laundry.
Frequently asked questions
Is a larger machine always cheaper?
Not necessarily. If it is rarely full, allocated equipment cost can offset the capacity advantage; compare actual loads and cycles.
When should I recalculate?
How do I calculate laundry cost per load? Add the variable costs and a fair share of equipment and repair costs for the same period, include rewashes if they consume resources, and divide by completed loads. Recalculate when utility rates, load size, or drying habits change.
Source reading: ENERGY STAR clothes washers and CFPB spending assessment. ENERGY STAR and CFPB provide consumer context for checking actual costs; they do not set a universal household price or guarantee savings.