Sitewide Sale Profit Calculator
It discounts what was already selling.
It discounts what was already selling.
Net gain from the sale
$5,000
margin falls to 30%
The sale nets $5,000. Sitewide discounts also apply to products that were selling perfectly well at full price, which is the cost that never appears in the sale report.
How the Sitewide Sale Profit Calculator works
A sitewide discount applies to products that were selling perfectly well at full price, which is the cost that never appears in the sale report. Revenue rises, contribution falls, and only one of those shows up in the headline.
Also known as: storewide sale margin · sitewide discount profitability · whole site sale calculator
The least efficient discount structure
A sitewide percentage discount applies equally to every product regardless of its margin, which means it gives away most on the products that can afford it least.
On a catalogue with margins ranging from 15% to 60%, a 20% sitewide discount removes a third of the profit on the best lines and considerably more than all of it on the worst.
The reason it persists is communication. One number on a banner is understood instantly, and a tiered structure is not. That is a real advantage and it should be weighed against a cost that is usually much larger than anyone calculates.
Working out what it costs
The calculation is contribution at the discounted prices against expected volume, compared with normal contribution at normal volume.
The input that decides it is the volume uplift, and it should be estimated from previous sales rather than hoped for. Most businesses that have run several sitewide sales have the data to know their typical uplift, and most have never extracted it.
The result frequently shows that a sitewide sale needs an implausible uplift to break even. At a 35% blended contribution margin, a 20% discount needs volume to rise 133% simply to hold contribution flat. Very few sitewide sales achieve that.
Excluding products, and the mechanics of it
The obvious improvement is to exclude thin-margin lines, which recovers most of the loss and complicates the message.
Exclusions have to be visible before the customer adds to basket. Discovering at checkout that the item is excluded generates abandonment and complaints, and it is the single most common reason sitewide sales produce customer service load.
In practice a small exclusion list, clearly marked on the product pages, is well tolerated. A long or arbitrary one reads as a bait and switch and does more damage than the margin it protects.
What it does to the rest of the year
The largest cost of a sitewide sale is usually not the sale itself but its effect on the periods around it. Sales pulled forward from the following weeks, and customers learning that a sitewide sale happens periodically and waiting for the next one.
The pattern is visible in the data once a business has run several. Full-price sales in the weeks before an anticipated sale decline, because customers hold off, and the anticipated sale then has to be run to capture the demand that was deferred.
That is a trap that closes gradually. Businesses several years into a regular sale calendar frequently find that most of their volume happens during promotions and that removing them is no longer possible without a substantial revenue drop.
The alternatives that achieve most of the effect
Category sales achieve the visibility of a sitewide event with a fraction of the margin cost, and they let you concentrate the discount where the margin can absorb it.
Threshold offers, free shipping over an amount or a spend-and-save ladder, generate similar urgency without reducing the unit price at all.
A gift with purchase across the site is the closest structural equivalent to a sitewide sale at a small fraction of the cost, because the cost is the gift rather than a percentage of everything. It communicates almost as simply and it does not teach the customer base that the list price is negotiable.
Where to go next
The Sitewide Sale Profit question rarely arrives on its own. These are the ones that usually come with it:
- Seasonal Sale Calculator — The quiet period afterwards belongs in the report.
- Flash Sale Profit Calculator — Demand pulled forward is the hidden cost.
- Discount Margin Impact Calculator — Required volume rises steeply as margin falls.
- Etsy Fee Calculator — Every Etsy fee on one sale, itemised.
Not financial advice. Marketplace fees change, and they vary by country, plan and seller status. Every rate here is an editable default, not a quoted price, check the platform's current fee schedule before you price a product against it. This is not tax or business advice.
Frequently asked questions
Do sitewide sales work?
They reliably lift revenue and frequently reduce contribution. Whether the trade is worth it depends on margin, the volume uplift and what the sale is actually for.
What is the alternative?
Targeted discounts on specific categories or slow movers, which achieve the stock objective without discounting the products that needed no help.
When is a sitewide sale right?
When the objective is customer acquisition or clearing broad excess stock, and the volume genuinely arrives. As a revenue-target tool it usually costs more than it earns.
How do I limit the damage?
Exclude bestsellers and new arrivals, set a minimum spend, and hold the sale short. Each reduces the share of the discount that goes to sales you already had.
Related calculators
Seasonal Sale Calculator
The quiet period afterwards belongs in the report.
OpenFlash Sale Profit Calculator
Demand pulled forward is the hidden cost.
OpenDiscount Margin Impact Calculator
Required volume rises steeply as margin falls.
OpenEtsy Fee Calculator
Every Etsy fee on one sale, itemised.
Open