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Side-by-side comparison

Laundry detergent

The full per-unit breakdown — supermarket vs Amazon AU.

Disclosure: As an Amazon Associate I earn from qualifying purchases. If you click through and buy, it costs you nothing extra — that's how the site stays free. Prices are accurate at the time of fetch and can change.
Estimated savings
$11.25/ month saved
That's $135.00 over a year, based on national-average usage of approx 3L per month.
Woolies
Omo
Active Clean Laundry Liquid Detergent 4L
90¢
per 100ml
Pack price
$36.00
Pack size
4L
Amazon AU
Amazon AU
Cold Power
Advanced Clean Front + Top Loader Laundry Washing Liquid 4 Liter
53¢
Save 41%
per 100ml
Pack price
$21.00
Pack size
4L

Price history

How this price has moved over the last 90 days.

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Want the full reasoning?

I wrote a full article that walks through the maths step by step, including when the supermarket actually wins.

Read the full breakdown →

Frequently asked

  • Is Cold Power on Amazon AU cheaper per 100ml than Omo at Woolies?

    Yes. Based on prices fetched on the latest refresh, Cold Power on Amazon AU works out about 41% cheaper per 100ml than Omo at Woolies.

  • How much can an Australian household save per year on laundry detergent?

    For a household using approximately 30 100mls per month, switching from Omo at Woolies to Cold Power on Amazon AU saves roughly A$135 per year. Adjust the figure for your household on the home page if your usage is higher or lower.

  • How is the cost per 100ml calculated?

    Pack price is divided by the pack's 100ml count (or ml / g where the category is measured by weight or volume), then any active Subscribe & Save discount is applied. Supermarket prices come from public Woolworths and Coles product feeds refreshed daily; Amazon prices come from the Amazon Product Advertising API. Source and fetch timestamp are shown on each product card above.