The ones people open first
Thirty calculators are live. These six cover the questions that show up before a price tag, listing, or menu reprint.
- 01Markup calculatorCost + markup % → shelf price (and the margin that comes with it).
- 02Reverse sales taxTax-included total in; pre-tax and tax out. You type the rate.
- 03Etsy feesListing + transaction + processing on one sale — rough take-home.
- 04Break-even pointFixed costs ÷ contribution = units until you’re not losing money.
- 05Product pricingTarget margin in; the selling price that actually hits it.
- 06Shopify profitProduct cost + typical per-order fees → net on one checkout.
Find it by the job you're doing
Not a feature matrix — groups for the work in front of you: pricing a SKU, covering fixed costs, splitting tax, or checking what a marketplace leaves.
Markup & margin
Markup is profit over cost. Margin is profit over price. Same dollars, different denominator — these tools keep the two from getting swapped on the sales floor.
Markup·Margin·Markup vs margin·Keystone
all markup & margin →Break-even
Rent and software don’t wait for a busy week. Plug in fixed costs, price, and variable cost; see how many units (and dollars) cover the month.
Break-even units·Break-even revenue·Fixed vs variable·Contribution margin
all break-even →Pricing & food cost
Shelf price from a target margin, or food cost % from plate cost and menu price. Useful before you reprint tags or the next menu.
Product pricing·Food cost %·Recipe cost·Menu price
all pricing & food cost →Sales tax
We don’t look up your ZIP or scrape a rate table. You enter the rate you already use; we add tax onto a price or pull it out of a gross total.
Add sales tax·Reverse sales tax·Tax by rate·Total from subtotal
all sales tax →Fees & marketplace
Etsy, Shopify, and FBA nick every sale differently. These are estimates with common defaults — your seller dashboard is the source of truth.
Etsy fees·Shopify profit·Amazon FBA
all fees & marketplace →What this site is (and isn't)
01 The math is grade-school arithmetic with shop labels: markup vs margin, fee stacks, break-even units. There is no growth framework, no dashboard, and no account to create.
02 Inputs stay in your browser. We don't store costs, prices, or fee assumptions on a server. Refresh or close the tab and they're gone.
03 Fee and tax tools use rates youenter (or common defaults you can override). Marketplace dashboards and your state's rules win when numbers disagree. This is for planning a price — not filing taxes or reconciling books.
Estimates only — not tax, accounting, or legal advice.