Gross Profit Margin Calculator
Measure how much revenue remains after product cost.
Open toolMerchant decision tools for independent sellers
Know the number.
Make the call.
Fast, practical calculators for marketplace profit, pricing, advertising, inventory and logistics. Built to answer the question in front of you, then get out of the way.
Merchant desk Ready
18Focused
calculators
calculators
Pricing & margin01
Ads & acquisition02
Inventory planning03
Freight & logistics04
Marketplace profit05
Inputs stay in this browser.
New / Marketplace profit
Price the sale after the platform takes its share.
01 / Tools
Start with the decision
Choose the number you need to understand. Every tool includes the formula, assumptions and practical limits.
Markup Calculator
Convert cost and selling price into markup percentage.
Open toolContribution Margin Calculator
Estimate how much each sale contributes after variable costs.
Open toolBreak-Even Point Calculator
Find the number of units needed to cover fixed costs.
Open toolE-commerce Profit Calculator
Estimate profit per order after product, shipping, platform and ad costs.
Open toolBreak-Even ROAS Calculator
Find the minimum ROAS needed before ads become unprofitable.
Open toolMaximum Customer Acquisition Cost Calculator
Calculate how much you can spend to acquire one customer while keeping target profit.
Open toolWholesale Pricing Calculator
Set wholesale prices from unit cost and target margin.
Open toolDiscount Profit Impact Calculator
See how a discount changes margin and required extra sales.
Open toolInventory Reorder Point Calculator
Know when to reorder before stock runs out.
Open toolSafety Stock Calculator
Estimate buffer stock using max and average demand and lead time.
Open toolEconomic Order Quantity Calculator
Balance ordering and holding costs to estimate ideal order quantity.
Open toolInventory Turnover Calculator
Measure how many times inventory is sold and replaced.
Open toolLanded Cost Calculator
Estimate total delivered cost including freight, duties and handling.
Open toolDimensional Weight Calculator
Compare package dimensional weight with actual weight.
Open toolAmazon Profit Calculator
Estimate profit, margin and break-even price for an Amazon order with editable seller fees.
Open toolEtsy Profit Calculator
Calculate Etsy order profit with editable listing, transaction, payment and Offsite Ads fees.
Open tooleBay Profit Calculator
Estimate eBay profit after final value, per-order, promoted listing and insertion fees.
Open tool02 / Method
Visible math.
No black box.
Each calculator separates formula logic from page copy, validates unusual values and explains rounding. Changing marketplace fees stay editable.
Your inputs stay local
Calculations happen in your browser and are never submitted to our server.
Assumptions are shown
Every tool publishes its formula, variables, examples and limitations.
Rates stay current
Third-party fees are dated and editable instead of being hidden in code.
03 / Field notes
Read before you decide
Focused explanations for pricing, inventory and shipping decisions.
Pricing
Margin vs. Markup: The Pricing Difference Sellers Must Know
A practical explanation of why a 50% markup is not a 50% margin, with examples for small sellers.
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E-commerce
How to Calculate True Profit per Order
A step-by-step order profit method that includes product cost, shipping, ad spend, platform fees and returns.
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Finance
Understanding Contribution Margin for Small Businesses
Use contribution margin to decide which products, bundles or campaigns deserve more attention.
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Advertising
How Break-Even ROAS Works
Learn why a high ROAS can still lose money when margins are thin.
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E-commerce
How Returns Affect E-commerce Profit
Model refunds, reverse shipping and resale loss before a product looks healthier than it is.
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Inventory
Reorder Point and Safety Stock Explained
Avoid stockouts by combining demand, supplier lead time and a realistic buffer.
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Logistics
Dimensional Weight Explained for Online Sellers
Why large lightweight packages can be billed above their scale weight.
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Logistics
Understanding Landed Cost Before You Import
Bring freight, duties, insurance and handling into one per-unit cost.
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Pricing
How Discounts Affect Profit
Calculate how many extra units a discount must sell before it is worth running.
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Pricing
Common Product Pricing Mistakes
The quiet pricing errors that turn popular products into weak businesses.
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