Free tools
Calculators for the numbers behind the store.
Seven calculators, each inside the guide that explains its formula. No sign-up, no email, and every one shows its working so you can check it against your own spreadsheet.
What each one is for
Pick by the question you're asking.
ProfitVault
Shopify Profit Calculator
Net profit per order after product cost, shipping, payment fees, returns and ad spend — plus your break-even ad spend and break-even ROAS.
ProfitVault
Profit Margin Calculator
Gross and net margin from revenue, COGS and everything else, so you can compare products of very different sizes on the same basis.
ProfitVault
Break-Even Point Calculator
How many units you must sell to cover fixed costs, and the revenue that gets you there.
Foreshelf
Reorder Point Calculator
The stock level that should trigger a purchase order, from sales velocity, supplier lead time and your buffer.
Foreshelf
Safety Stock Calculator
The buffer that absorbs a good week or a late shipment — both the simple buffer-days method and the service-level formula.
Foreshelf
Economic Order Quantity
The order size that balances what it costs to place an order against what it costs to hold the stock.
Foreshelf
Inventory Turnover Calculator
How many times a year you sell through your stock, and the days of inventory that implies.
When the estimates stop being enough
A calculator works on the numbers you type. Your real costs move every week — suppliers reprice, carriers change zones, demand shifts. ProfitVault andForeshelf run these same calculations on your live Shopify data instead, per order and per SKU.