Laundry is a small decision repeated dozens or hundreds of times a year, and it has two separate planning questions: how much detergent should go in each load, and what does all that laundry cost? The laundry detergent calculator answers the first with a dose estimate; the laundry cost calculator answers the second with annual, monthly, and per-load figures. They are complementary — the dose you size with one becomes the detergent price you enter into the other.
What each calculator does
The laundry detergent calculator estimates detergent per load for liquid, powder, or pods. Liquid starts at a 60 ml base dose, powder at 90 g, and pods at one pod. It multiplies the base by a load-size multiplier (small 0.5, medium 1.0, large 1.5, extra-large 2.0), a soil multiplier (light 0.8, normal 1.0, heavy 1.2), and a water-hardness multiplier (soft 0.9, medium 1.0, hard 1.1). Liquid and powder round to one decimal place; pods round up to a whole pod and never below one. The page’s worked example — large load, heavy soil, hard water, liquid — gives 60 × 1.5 × 1.2 × 1.1 = 118.8 ml, while the same settings in pods calculate to 1.98 and display as 2 pods.
The laundry cost calculator estimates what laundry costs per load, per month, and per year, with a home mode and a laundromat mode. Home mode takes loads per week, washer type (high-efficiency 20 gallons, standard 35, top-loading 45), water cost per gallon, electricity cost per kilowatt-hour, detergent cost per load, and machine purchase price. Electricity is fixed at 3.5 kilowatt-hours per load, and machine price is spread over eight years and the weekly load count. In the worked example, a standard washer with 4 loads per week, water at 0.015/gallon, electricity at 0.12/kWh, detergent at 0.35 per load, and an 800-dollar machine yields a 1.775769-dollar cost per load and an annual cost of 369.36 dollars (30.78 per month, 208 loads per year). Laundromat mode simply multiplies the combined per-load price by loads per week and 52.
Side-by-side
| Laundry detergent calculator | Laundry cost calculator | |
|---|---|---|
| Question it answers | How much detergent per load? | What does laundry cost per load, month, or year? |
| Inputs | Load size, soil level, water hardness, detergent type | Loads per week, washer type, utility rates, detergent cost, machine price — or laundromat price |
| Primary output | Dose in ml, g, or whole pods | Annual, monthly, and per-load cost in dollars |
| Example | Large + heavy + hard + liquid → 118.8 ml | 4 loads/week standard washer → $369.36/year |
| Modes | Liquid, powder, pods | Home or laundromat |
| Typical use | Sizing a dose, comparing products, teaching consistent measuring | Budgeting, home vs laundromat decisions, cost per load |
When to use which
Use the laundry detergent calculator when you are dosing: starting a new bottle, comparing concentrated products, adjusting to a new washer, or teaching household members to measure consistently. Its baseline is transparent — base dose times three multipliers — but the label on a specific detergent takes precedence, since brands vary in concentration and cap markings.
Use the laundry cost calculator when the question is money: how much this year’s laundry will cost, whether home or laundromat is cheaper, or which part of the cost per load dominates. The result is a simplified model — water gallons per washer type, a fixed 3.5 kWh per load, and an eight-year machine spread — so it is built for budgeting and comparisons rather than bill reconciliation. Check whether machine depreciation, utilities, or weekly load count is driving the total before changing behavior.
Limits and disclaimer
Both pages are estimates. The detergent calculator does not replace a product label, and real results depend on washer design, concentration, water temperature, and fabric type; severe stains need pretreatment, not just a bigger dose. The cost calculator ignores cycle settings, hot water, dryer efficiency, utility tiers, maintenance, and repairs, and its fixed electricity assumption means line-drying or gas drying changes the real figure. Neither page is financial or professional advice, and for consequential budgeting decisions the governing utility rates, product labels, and appliance specs remain authoritative.