Know where the profit stops.
Enter your expected sale price, purchase cost and selling costs. Check scenario profit, net margin, ROI and your maximum buying price.
RESELLERS AND DROPSHIPPERS
Less chaos.
Clearer selling.
Know your costs, organise your stock and see what you actually earn. Keep buying decisions, sales and profit in one workspace.
7-day workspace trial · No card required · Free unlimited calculator
Buying decisionsStock controlActual profit records
01Calculate02Decide03Track04Improve
AN EXAMPLE SALE
What did you actually keep?
Sale proceeds£80.00
Purchase cost£40.00
Fees, delivery & packaging£12.00
Item profit before tax & overheads£28.00
Net margin / purchase ROI35% / 70%
Illustrative figures entered by a seller. No earnings are promised.
One item. One clear record.Costs you can account for.Results you can measure.
SELLING, WITHOUT THE SCATTER
The value is the time
you get back.
A repeatable routine from checking a potential purchase to recording its final profit.
Give every item a place.
Save owned stock or supplier variants with costs, targets, size, colour and your own evidence notes. Keep track of what needs listing.
Learn from the sale.
Log real proceeds and selling costs. See monthly profit, cash in stock and ageing items alongside your original estimates.
Keep the bigger picture.
Record overheads, export your stock and set aside a tax-reserve estimate. Keep records readable and exportable even after your trial or subscription ends.
YOUR NUMBERS, MADE CLEARER
Useful calculations.
Visible assumptions.
You supply the prices and costs. Margin organises those figures and calculates the result, so an expected selling price stays clearly separate from money you have actually received.
Keep your own evidence.
Save source links, comparable counts and the date you checked an estimate. Review those notes before buying or listing. Figures you enter are not independently verified.
Keep one consistent ledger.Choose your workspace currency and language.Convert foreign costs before entering them. No mixed-currency totals.
BUYING DISCIPLINE
Know the profit before you buy.
Include fees, shipping and returns in your own figures. Calculate scenario profit, net margin, ROI and maximum buying price for free.
Open the free calculator ↗Unlimited calculations. No account, card or usage allowance required.
BUILT AROUND YOUR SELLING
Your stock.
Your costs. Your progress.
One complete workspace for stock, sales, expenses and profit. Calculations are always free and unlimited.
Margin
£7.99 per monthOne monthly subscription. No per-sale fees.
Stock, sales, expenses, profit, ROI, exports and tax-reserve estimates. Unlimited calculations.
Try the full workspace for 7 days. No card required and no automatic subscription.
After the trial, subscribe to add or edit records. Your existing records stay readable and exportable. The calculator stays free.
Start my 7-day trial ↗Cancel future renewals through Stripe. Paid access continues until the recorded paid period ends.
Try the saved workspace for 7 days without a card. Choose £7.99/month to continue adding and editing records. No automatic conversion from trial to paid.
After trial or paid access ends, your existing records stay readable and exportable. The calculator remains free.
No Margin sale fees, product-search allowances or calculation quotas. No automatic marketplace posting or supplier ordering.
REAL SELLER FEEDBACK
Built around real selling routines.
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