Find the “was” price your sale can show
Selling in the EU, EEA or Norway? For a Black Friday sale, count your prices from 28 October to 26 November.
A calculator, not legal advice. Rules differ by country: see Sources. Nothing you type leaves this page.
How it works
- Start from the day your sale starts. For Friday 27 November, the 30 days are 28 October to 26 November.
- Type every price you charged in those days. A promo that ran for one day counts too.
- The lowest one is your “was” price. Your % off comes from it, rounded down so you never show more off than you give.
- Norway: count back from the day the price cut starts. Advertising earlier? Also check the 30 days before your first ad and use the lower price.
29,90, 29.90 and 1 299,00 all work.
Where the rule comes from
- EU and EEA: the lowest price of the last 30 daysArt. 6a of the Price Indication Directive. Bird & Bird, “Transparency of price reductions”, 2025. EEA: EEA Joint Committee Decision 69/2021, in force 1 April 2024.
- Your % off badge counts tooEU Court of Justice, 26 September 2024, case C-330/23 (Aldi Süd). beck-aktuell (German), 26 September 2024
- Norway: the same 30 days, counted from the price cutPrisopplysningsforskriften § 9a, as Forbrukertilsynet applies it. Forbrukertilsynet decision, 25 June 2025 (Norwegian)
Every source we use is on the Sources page.
Want the rest of your offer checked?
Black Friday Price Check ($9) also checks countdowns, “only X left” and other claims, and gives you a dated plan to Cyber Monday.
See the Black Friday Price CheckWe make it. You don't need it for the check above.
Common questions
Which "was" price can I show in an EU sale?
The lowest price you applied in at least the 30 days before the price cut. That is Art. 6a of the EU Price Indication Directive. Exceptions, such as perishable goods or step-by-step cuts, differ by country.
Does the % off have to use that price too?
Yes. The EU Court of Justice ruled in case C-330/23 (2024) that a discount shown as a percentage must be worked out from the 30-day lowest price.
My sale starts on Black Friday, 27 November. Which days count?
The 30 days from 28 October to 26 November. Every price you charged in that window counts, including a promo that ran for one day.
Is the rule the same in Norway?
Almost. Prisopplysningsforskriften § 9a says the before-price is the lowest price you used in at least the 30 days before the marketing started. But Forbrukertilsynet, which enforces it, counts the 30 days back from the day the price cut starts. If you advertise your sale early, check both periods and use the lowest price.
Has anyone in Norway been fined for this?
Yes. Forbrukertilsynet fined a Norwegian online clothing shop NOK 2,000,000 over its before-prices in November and December 2024, including Black Friday (decision of 25 June 2025, which could be appealed).
Do authorities actually check this?
Yes. In an EU check of Black Friday and Cyber Monday 2025, 30% of 314 online traders in 23 EU countries, Iceland and Norway based their discounts on the wrong price. Source: European Commission, 26 March 2026.