Know what's selling, what to reorder, and what running out is costing you.
SELLEM builds stock forecasting, pricing and sales reporting tools for online sellers on Shopify, Amazon and eBay. Set up on your own data, checked line by line, and yours to keep.
For multichannel sellers turning over roughly £250k to £5m who have outgrown copy-and-paste spreadsheets but don't need an ERP or a full-time analyst.
Most growing sellers are flying on gut feel.
Sales are coming in across three or four channels, but the numbers that should guide buying and pricing live in separate exports nobody has time to join up.
Revenue is up. Profit isn't.
Marketplace fees, FBA charges, shipping, ads and returns eat into margin, and no one can say which products or channels are really worth it.
Best sellers keep running out.
Every stock-out loses sales, and on Amazon it can cost you ranking too. Meanwhile, cash sits in slow lines nobody is watching.
Ordering is guesswork.
Reorders are based on memory or last year's figures, with no lead times, inbound orders or recent trend built in.
Reporting eats your Monday.
Someone exports from every platform and stitches it together by hand, and the totals still don't quite agree.
Start with a Lost Sales & Profit Health Check.
Send your last 12 months of sales exports, current stock and product costs. Within five working days you get a short, plain-English report.
Go on to a build within 60 days and the full fee comes off the build price.
Book a Health Check- What stock-outs cost youEstimated lost sales and lost gross profit, by product and by month.
- Where your margin really goesProfit per product and per channel after fees, shipping and returns.
- Your ten most valuable actionsWhat to reorder now, what's overstocked, and which listings to reprice.
What the Stock Forecaster shows you.
One row per product: how fast it really sells when it's in stock, when it runs out, whether the next delivery lands in time, and exactly how many to order. Shown here with sample data for a fictional seller.
| Product | Supplier | In stock | Days cover | Order qty | Order value | Status |
|---|---|---|---|---|---|---|
| Stackable Crate (Large) | Northgate Homeware | 7 | 2 | 240 | £11,299 | Order now |
| Weed Puller (Large) | Greenfield Wholesale | 0 | 0 | 312 | £8,449 | Out of stock |
| Bamboo Chopping Board | Northgate Homeware | 0 | 0 | 516 | £6,868 | Out of stock |
| Fairy Lights 10m (Large) | Brightworks Trading | 27 | 22 | 120 | £6,041 | Order now |
| LED Strip 5m | Eastline Imports | 104 | 39 | 204 | £5,569 | Order now |
| Insulated Mug | Peakline Manufacturing | 412 | 96 | 0 | - | OK |
Sample data for a fictional seller with 120 products across Shopify, Amazon FBA and eBay. Order quantities are rounded to case packs and minimum order quantities.
Tools built around the questions you ask every week.
Each one is set up on your own data, delivered in Excel, and includes a plain-English settings tab, built-in data checks and a note explaining how every figure is worked out.
Stock Forecaster
What do I order, how much, and when?
- Demand measured on in-stock days
- Reorder points and run-out dates
- Inbound purchase orders tracked
- Lost-sales report
Pricing & Profit Engine
Which products and channels make money, and what should I charge?
- True margin after every fee
- Target-margin prices by channel and pack size
- Flags for loss-making listings
Sales Control Tower
How are we doing this month, and where will we land?
- Month to date against target
- Month-end forecast
- Channel and product gainers and losers
- Refunds and data checks
Monthly Insight
What changed, and what should I do about it?
- Monthly data refresh
- Written commercial summary
- Tool updates and a 30-minute review call
Prices exclude VAT and depend on the number of channels, products and data sources. You get a fixed quote before any work starts.
From exports to answers in about two weeks.
No new software to learn, and no logins to hand over.
A 20-minute call
We agree the questions you need answered and which platforms you sell on.
You send exports
Standard reports from Shopify, Amazon Seller Central, eBay or Linnworks.
We build and check
Your tool is set up on your data, with every figure reconciled back to the source exports.
Handover
A walkthrough call, a guide inside the file, and 30 days of support for questions and tweaks.
Built by an operator, not a template shop.
I spent eight years running the commercial side of a multichannel e-commerce business. SELLEM packages the tools I built and used every day.
Shaun Clarke, founder
- ChannelsShopify, Amazon FBA and merchant-fulfilled across the UK and EU, eBay and other marketplaces, with Linnworks for order and stock data.
- Day-to-day workPricing and margin, stock forecasting and purchasing, weekly commercial reporting, and a Magento to Shopify migration.
- How the tools workPlain-English settings, data checks that flag problems before you act on them, and a written method for every figure.
- Your dataUsed only for your project, and deleted on request once the work is done.
Questions sellers ask.
Do I need to give you access to my accounts?
No. You download standard reports from your platforms and send them over. If you'd rather, we can walk through the exports together on a call.
Which platforms do you work with?
Shopify, Amazon Seller Central, eBay and Linnworks are the most common. Other marketplaces work too, as long as they can export order lines with dates, SKUs, quantities and values.
Why Excel?
Almost every business already has it, there's no subscription, and you can see exactly how every number is worked out. If you work in Google Sheets, ask and we'll discuss what's possible for your tool.
How accurate is the lost-sales figure?
It's an estimate based on each product's normal sales rate before it ran out. Some customers wait or buy something else, while lost marketplace ranking can make the true cost higher. The report explains the method and its limits.
What happens to my data?
It's used only for your project and stored securely. We ask you to remove customer names and addresses before sending, and we delete your files on request once the work is finished.
Find out what stock-outs cost you last year.
Book a free 20-minute call, or ask for a walkthrough of the sample Stock Forecaster.