TL;DR: The cheapest natural laundry detergent by pack price is not the cheapest by wash. The cheapest per-wash options in Australia sit between $0.11 (Aldi Laundrite Powder, budget conventional) and $0.18 (Ecostore Ultra Sensitive, supermarket eco). Resparkle sits at $0.33 per wash, which makes it mid-pack on cost. Where Resparkle wins is concentration-adjusted value: it is independently lab tested to outperform CHOICE's #1-rated supermarket detergent on five common stains, ships plastic-free, and carries every ingredient at EWG 1 or 2. The cheapest option is not always the best-value clean. This guide ranks nine products on true cost-per-wash and then adds the performance and ingredient context so you can pick the right option for your household.
By the Resparkle team, a small family business based in Brisbane. Last updated: 2026-05-26.
Why "cheapest" is a misleading search
When you search for the cheapest natural laundry detergent in Australia, you're probably not actually looking for the lowest dollar amount per pack. You're looking for the lowest cost to get a load of laundry clean.
Those are different numbers.
A $10 pack that needs 30 g per load gives you 33 washes for $0.30 each. A $18 pack that needs 10 g per load gives you 55 washes for $0.33 each. The second pack costs $8 more to buy and $0.03 more per wash. The first pack is cheaper to buy. The second pack is concentrated, carries no filler salts, and delivers comparable cleaning in two teaspoons.
Pack price is a packaging metric. Per-wash cost is a cleaning metric. This guide uses the cleaning metric.
How we calculated cost per wash
Simple methodology, stated upfront:
Cost per wash = pack price ÷ number of washes
Number of washes = pack weight ÷ manufacturer-stated dose per load
All washes calculated on the manufacturer-stated standard load dose. Where a brand gives a range (e.g. "1–2 scoops"), we used the lower end for concentrated products and the mid-point for standard-dose products. Every number is sourced from the brand's own product page or supermarket shelf price as of May 2026. Where products are sold in multiple sizes, we used the smallest available retail unit.
The cost-per-wash table: nine products ranked cheapest to most expensive
| Product | Type | Pack price | Pack size | Dose per load | Washes | Cost per wash |
|---|---|---|---|---|---|---|
| Aldi Laundrite Powder | Budget conventional | ~$5.99 | 900 g | ~17 g | ~53 | ~$0.11 |
| Earth Choice Laundry Powder | Budget eco | ~$9.00 | 1 kg | 15 g | ~66 | ~$0.14 |
| Ecostore Ultra Sensitive Powder | Supermarket eco | ~$12.00 | 1 kg | 15 g | ~66 | ~$0.18 |
| Skipper Laundry Sheets | Eco sheets | From $14 | ~73 sheets | 1 sheet | ~73 | ~$0.19 |
| Cold Power Regular Powder | Conventional | ~$12.00 | 1 kg | 18 g | ~55 | ~$0.22 |
| OMO Laundry Powder | Conventional | ~$15.00 | 1 kg | 18 g | ~55 | ~$0.27 |
| Persil Powder | Conventional | ~$16.00 | 1 kg | 18 g | ~55 | ~$0.29 |
| Resparkle Natural Laundry Powder | Premium eco | $18.00 | 600 g | 10–14 g | 55 | $0.33 |
| Koala Eco Laundry Liquid | Premium eco liquid | ~$29.95 | 1 L | ~30 ml | ~33 | ~$0.91 |
Sources: brand websites, Coles and Woolworths shelf prices, May 2026. Koala Eco pricing from most recent available product page.
Reading the table: what the ranking doesn't tell you
Cost per wash is one variable. Three others change the picture significantly.
1. Cleaning performance per wash
The cheapest wash only counts if the load actually comes out clean. Independent CHOICE lab testing shows wide variation:
- OMO Ultimate Powder: 86% CHOICE score (front-loaders), the top performer in the most recent test.
- Aldi Laundrite Powder: 79% (front-loaders), a CHOICE top pick in the budget tier.
- Skipper Laundry Sheets: 51% (front-loaders), 46% (top-loaders). CHOICE's description: "barely better than washing with plain water."
- Aldi Laundrite Liquid: 50% (front-loaders), the lowest score in the test. "No better than plain water."
Source: CHOICE laundry detergent lab tests.
Resparkle is not in the CHOICE product table. Resparkle's published evidence is brand-commissioned: independently lab tested to outperform CHOICE's #1-rated supermarket detergent on five common stains. That is a different test design (head-to-head benchmark comparison rather than panel scoring), but the benchmark is the same reference point CHOICE itself uses.
What this means for cost: a product that scores 51% and prompts re-washing costs you twice the per-wash rate on the re-washed loads. A product that scores 79%+ or clears a direct benchmark comparison earns its stated per-wash cost. Factor in re-wash probability when comparing cheap to mid-tier options.
2. Ingredient quality
Cost per wash doesn't capture what is in the product. Two powders at $0.22 per wash can have very different ingredient profiles.
Key ingredients to avoid in natural and conventional laundry powders:
| Ingredient | Why it matters |
|---|---|
| Optical brighteners | Synthetic dyes that stay on fabric and transfer to skin; not biodegradable |
| Synthetic fragrance (parfum) | Undisclosed chemical mixtures; common trigger for sensitive skin and asthma |
| SLS/SLES | Skin irritant in sensitive users; SLES can carry 1,4-dioxane contamination |
| Phosphates | Aquatic eutrophication; largely phased out in AU but check imports |
| Chlorine bleach | Harsh on fabric and skin; reactive with organic matter |
Resparkle's full ingredient list, with EWG hazard ratings: sodium carbonate (EWG 1), sodium percarbonate (EWG 1), coconut surfactant (EWG 1), sodium carboxymethyl cellulose (EWG 1), sodium metasilicate pentahydrate (EWG 2), sodium citrate (EWG 1), natural enzyme blend (EWG 1), essential oil blend (Lemon Eucalyptus variant only). No SLS, no optical brighteners, no synthetic fragrance, no phosphates.
Cold Power and OMO contain synthetic fragrance and optical brighteners. Earth Choice and Ecostore are cleaner on ingredients than mainstream conventional options, but neither publishes a per-ingredient EWG rating table to the same depth.
3. Packaging
Cheap detergent is cheap in part because the manufacturer externalises the cost of plastic waste disposal to you and to the environment. That plastic goes into the yellow bin, and roughly 12–13% of all plastics are recovered in Australia (APCO 2022–23). The rest goes to landfill.
Resparkle's powder ships in an industrially compostable bag, plastic-free. Ecostore and Earth Choice ship in plastic. Skipper sheets have some compostable packaging. The cost-per-wash table doesn't capture the plastic disposal cost, but it is real.
The concentration reframe: why Resparkle is mid-pack on price but front-pack on value
Resparkle is not the cheapest option in the table. $0.33 per wash puts it near the top of the cost ranking and notably above Earth Choice ($0.14) and Ecostore ($0.18).
Here is why that number tells an incomplete story.
Resparkle's 600 g pack doses at 10–14 g per load (2–3 teaspoons). There are no filler salts like sodium sulfate, no bulking agents. Every gram of the 600 g bag is active cleaning ingredient. That is what concentration means in practice: 600 g of Resparkle is close to 600 g of cleaning actives.
Compare to a conventional 1 kg powder at $0.22/wash. Part of that 1 kg is sodium sulfate, a cheap filler used to add weight and free-flow properties to lower-cost powder formulations. You are dosing more grams per wash because more of each gram is filler. The active-per-wash count is lower even if the wash count looks similar.
This is why per-wash cost is better than per-kg cost as a comparison metric, and why per-active-gram-per-wash cost would be better still. We don't have that data across all products, but the concentration principle is well-established in detergent formulation: cheaper powders compensate for lower active concentration with higher dose requirements.
Resparkle's $0.33 per wash is independently verified to clean at a benchmark-beating standard. The cheapest options in the table are not independently verified at that level. On a cost-per-verified-clean-load basis, the spread narrows considerably.
Brand-by-brand verdict
Aldi Laundrite Powder (~$0.11/wash): the budget benchmark
The cheapest per wash in this table, and a CHOICE top pick at 79% for front-loaders. Synthetic ingredients, plastic packaging, not eco-positioned. If your only criterion is lowest cost and CHOICE performance, this is a credible answer. Families with sensitive skin or ingredient concerns should look elsewhere.
Earth Choice (~$0.14/wash): best value eco on a supermarket shelf
Available in Coles and Woolworths. Eco-positioned with plant-derived surfactants. No published per-ingredient EWG ratings. Plastic packaging. For households beginning their low-tox cleaning journey, Earth Choice is often a reasonable starting point. Not independently lab-tested to a published benchmark.
Ecostore Ultra Sensitive (~$0.18/wash): the supermarket eco leader
A well-established NZ brand with strong eco credentials, EWG-friendly formulation, and retail availability. Plastic packaging. If you can't or won't buy online and want a plant-based powder, Ecostore is the best option on a supermarket shelf.
Skipper Sheets (~$0.19/wash): cheap per wash, poor per clean
The per-wash cost looks attractive at $0.19. The CHOICE score of 51% (front-loaders) changes that calculation significantly. CHOICE described Skipper's sheets as "barely better than washing with plain water." If you re-wash loads because they didn't come out clean, your effective cost doubles. Sheets earn their place for travel and convenience use, not everyday family laundry.
Cold Power (~$0.22/wash): the conventional reference point
The mass-market benchmark. Synthetic surfactants, optical brighteners, synthetic fragrance, plastic bottle. Cleans well. Not the right answer for sensitive skin, eczema, or any household trying to reduce chemical or plastic exposure.
OMO (~$0.27/wash): top CHOICE performer, conventional ingredients
OMO Ultimate Powder scored 86% in CHOICE's most recent front-loader test. For households that want strong performance and don't have ingredient constraints, OMO performs. Synthetic ingredients throughout, plastic packaging.
Resparkle Natural Laundry Powder ($0.33/wash): the lab-tested natural pick
Not the cheapest on the table. The strongest published performance evidence in the natural powder category. Independently lab tested to outperform CHOICE's #1-rated supermarket detergent on five common stains. Every ingredient EWG 1 or 2. Plastic-free industrially compostable bag. Australian-made; Resparkle partners with Brunswick Industries (which employs people with disabilities) and Brite Industries. Gold + Editor's Choice at the 2020 Australian Non-Toxic Awards.
The Complete Laundry Bundle at $89 includes four 600 g packs plus a 700 g Universal Stain Remover, covering 220+ washes. Buying in bulk holds the same $0.33 per wash on the powder.
Koala Eco (~$0.91/wash): premium liquid, highest cost
Koala Eco is a well-formulated natural liquid. The $0.91 per wash (at standard liquid dose) puts it well above the rest of this table. Liquid's format inherently carries more cost per active gram than powder due to water content and plastic packaging requirements. Currently sold out on many SKUs.
Where Resparkle doesn't win
Three gaps worth naming directly:
- Cost. If your budget ceiling is under $0.20 per wash, Earth Choice or Ecostore are the correct answers. Resparkle's premium is real. It buys lab performance data, plastic-free packaging, and the Australian-made supply chain story. If those don't matter to your household, the premium is hard to justify.
- Retail availability. Resparkle is direct-to-consumer only. Not in Coles or Woolworths. If you shop in-store and don't want to manage a separate online order, Ecostore Ultra Sensitive is the pick.
- No liquid format. For households where liquid is the right format (hard water above 200 ppm, heavy pre-soaker households), Resparkle doesn't offer an alternative. Kin Kin Naturals is a well-formulated natural liquid option.
The decision framework: which one is right for your household
| Your priority | Pick |
|---|---|
| Absolute lowest cost | Aldi Laundrite Powder (~$0.11/wash) |
| Lowest eco cost in a supermarket | Earth Choice ( |
| Lab-tested natural powder with plastic-free packaging | Resparkle Natural Laundry Powder ($0.33/wash) |
| Sheets for travel / convenience | Skipper (~$0.19/wash, accept the CHOICE cleaning result) |
| Best raw CHOICE score regardless of eco | OMO Ultimate Powder (~$0.27/wash, 86%) |
| Natural liquid with strong formulation | Kin Kin Naturals (verify current pricing) |
For most eco-motivated family households running 5+ loads a week, the correct question is not "what is the cheapest natural detergent" but "what is the cheapest option that will actually clean my laundry reliably, without synthetic ingredients, and without generating plastic waste." At that level of specificity, the field narrows sharply.
Try Resparkle
Resparkle Natural Laundry Powder is $18 for 55 washes. If you want the best-value entry into the Resparkle range, the Complete Laundry Bundle at $89 covers 220+ washes with four powder packs and a Universal Stain Remover included.
Related reading
- Is natural laundry detergent worth the price?: full cost-benefit breakdown including the hidden costs of cheap detergent.
- Best natural laundry detergent Australia 2026: the full brand ranking with lab data.
- Best natural laundry powder Australia 2026: powder-specific guide with dose math.
- Powder vs sheets vs liquid: which eco laundry format wins: format-first comparison including the CHOICE sheets data.
- Eco laundry powder Australia: the complete buyer's guide: four-axis grading framework for any powder on the shelf.
- How much laundry powder per load: dose math and why using too much detergent inflates your per-wash cost.
Sources
- Resparkle Natural Laundry Powder product data: https://resparkle.com.au/products/natural-laundry-powder
- CHOICE, "The best and worst laundry detergents from our lab tests": https://www.choice.com.au/home-and-living/laundry-and-cleaning/laundry-detergents/articles/the-best-and-worst-laundry-detergents
- CHOICE individual review, Skipper Laundry Detergent Sheets Front Loader: https://www.choice.com.au/products/home-and-living/laundry-and-cleaning/laundry-detergents/skipper-laundry-detergent-sheets-front-loader
- Inkl, 2024 CHOICE test summary: https://www.inkl.com/news/powder-up-old-school-laundry-detergents-best-bet-for-cleaner-clothes-2024-choice-test-finds
- Environmental Working Group, Guide to Healthy Cleaning: https://www.ewg.org/cleaners/categories/9-laundry/
- APCO 2022–23 Australian Plastics Recycling Survey: https://www.packagingcovenant.org.au/
- 2020 Australian Non-Toxic Awards (Gold + Editor's Choice, Resparkle Natural Laundry Powder)
- Supermarket shelf prices (Cold Power, OMO, Persil, Earth Choice, Ecostore): Coles/Woolworths, May 2026
- Skipper product pricing: per skipperwash.com product pages
- Koala Eco product pricing: per koalaeco.com product pages