Profit Margin Calculator
- Shopify profit reports
Definitions of profit and margin as used in a store report, and gross margin as (net sales − cost) ÷ net sales × 100. This page is not a Shopify fee estimate.
- OpenStax Contemporary Mathematics 6.2: discounts, markups and sales tax
How markup is defined on cost, and price = cost × (1 + markup).
- OpenStax Principles of Marketing 18.3: retailing strategy decisions
Markup as (selling price − purchase price) ÷ purchase price × 100, keystone pricing as doubling the wholesale price, and gross margin as net sales minus the cost of goods sold, shown as a share of net sales.
- University of Maine Cooperative Extension, Bulletin #3000: Basic Pricing Strategies for Small Businesses
Markup can be quoted on cost or on the selling price; the retail trade calls a markup on the selling price a margin.
- OpenStax Financial Accounting 6.6: multi-step income statements
Gross margin, income from operations and net income as the successive levels of an income statement.
Product Pricing Calculator
- Shopify: markup vs margin
The definitions of margin and markup, selling price = cost ÷ (1 − target margin) with a $30 cost and 25% margin giving $40, and a markup-to-margin chart. The article shows an update date of September 16, 2026. It has no percentage-fee method. This page does not use its benchmark figures.
- OpenStax Contemporary Mathematics 6.2: discounts, markups and sales tax
Markup defined on cost, and sales tax added on top of a price. It does not define margin.
- Shopify: how to price a product
Variable cost examples (packaging, shipping, credit card processing fees), the cost-per-unit formula and the price formula: cost per unit ÷ (1 − desired profit margin as a decimal). The article is dated September 3, 2026. It does not give a method for a percentage fee, so the fee version on this page is algebra on that formula. This page does not use its industry margin figures.
Break-Even ROAS Calculator
- Amazon Ads: the ads math guide
ROAS as revenue attributed ÷ ad spend, and break-even ROAS as 1 ÷ gross profit margin. Its margin counts cost of goods sold only, so this page defines its own margin.
- Google Ads Help: conversion value per cost, definition
Conversion value per cost as conversion value ÷ cost, an estimate of return on investment.
- OpenStax Principles of Managerial Accounting 3.1: contribution margin
Contribution margin as sales minus variable costs, and its ratio to the sales price.
- Amazon Ads: the ACOS guide
ACOS as ad spend ÷ ad revenue × 100, and ROAS as its inverse.
- Google Ads Help: About Target ROAS bidding
Target ROAS as sales per ad dollar (the $5 for $1 example), and the advice to leave the most recent conversion delay period out of a ROAS evaluation.
Contribution Margin & Break-Even Calculator
- OpenStax Managerial Accounting 3.1: contribution margin per unit, ratio and total
Contribution margin as price minus variable cost per unit, its ratio to price, total contribution, and fixed costs as costs that do not change within a given range. It does not compare contribution margin with gross margin.
- OpenStax Managerial Accounting 3.2: break-even in units and dollars
Break-even units as fixed costs divided by contribution per unit, the profit-goal version of that formula, and the assumptions of constant price and sales mix. It does not say how to round part units: rounding up is this calculator's rule for whole sales.
- SBA: break-even point
Fixed and semi-variable (mixed) costs with examples, the single-product basis, the suggestion to add about 10% for unpredictable expenses, and the caution that the result is an estimate.
- OpenStax Financial Accounting 6.6: multi-step income statements
Gross margin as net sales minus cost of goods sold. It does not mention variable costs or contribution margin.
- OpenStax Managerial Accounting 3.5: margin of safety
Margin of safety as the difference between current sales and break-even sales, and in dollars as budgeted or actual sales minus break-even sales. The calculator does not work it out; the break-even sales guide uses it.
Etsy Fee & Profit Calculator (US)
- Etsy Fees & Payments Policy
The $0.20 listing charge, the 6.5% transaction fee, what it is charged on and that US sales tax is excluded.
- Etsy Payments Policy: section 9
The Etsy Payments fee of 3% plus $0.25 for a US bank account, charged on the order amount including shipping and tax.
- Etsy Help: Offsite Ads
Offsite Ads fees only on attributed orders, the 15% and 12% tiers and the $100.00 cap per order.
- Etsy Help: How to Issue a Full or Partial Refund For an Order
A refund through Shop Manager credits back the transaction and processing fees for the refunded transactions. Listing fees come back only if the transaction is also canceled.
- Etsy Help: Payment processing fees
On a refund, the Etsy Payments processing fee is credited in proportion to the refund amount.
- Etsy Help: Fees and Listing Multiple Quantities
The first unit is covered by the listing fee already paid; Etsy charges $0.20 for each extra unit sold in one order.
- Etsy Help: What are the Fees and Taxes for Selling on Etsy?
Etsy calls the charge for each additional unit sold in one transaction a multi-quantity fee.
eBay Fee Calculator (US)
- eBay Help: Selling fees
Category rates, fee bases, insertion fees, exceptions and extra charges.
- eBay Seller Update Winter 2024: Fees & financials
Per-order threshold and the trading card example.
- eBay Help: Store selling fees
How Store subscriber rates differ.
- eBay Help: Fee credits
Fee credits on returns and refunds.
- eBay Help: General campaign strategy
Promoted Listings General rates and ad fees.
- eBay Help: Tax policy
Sales tax collected and remitted by eBay.
Profit Per Order Calculator
- OpenStax: merchandising and net sales
Net sales, returns, allowances and cost of goods sold. It does not define gross margin in its text.
- OpenStax: income statements
Gross margin, selling expenses such as ads, and net income. It does not set a profit target for an order.
- OpenStax: contribution margin
The amount left after variable costs to cover fixed costs and profit. It does not give this tool's returns model.
- IRS: Publication 334 (2025)
How sales tax collected from buyers is treated for income, and tax paid on goods bought for resale. It is not tax advice.
- Printful: returns and refunds
One provider's return policy on the day read. It does not describe other providers.
- Printful: how payments work
One provider's price structure on the day read. It does not describe other providers or set the example prices.
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