Free ecommerce & business calculators.
Explore professional calculators built for ecommerce businesses, retailers, brands and online sellers. Analyze profitability, pricing, marketing performance, customer economics, inventory, finance and ecommerce operations using practical tools designed for real business decisions.
Find the right calculator for every business decision.
Browse 50 professional calculators organized into seven business categories. From profitability and pricing to customer analytics, inventory and finance, every tool is designed to help ecommerce businesses make smarter decisions.
Profitability
Measure margins, profit, contribution and financial performance across products and entire businesses.
Pricing
Calculate prices, markups, discounts and break-even points using real cost and margin targets.
Marketing
Measure advertising performance, campaign efficiency and customer acquisition profitability using practical marketing metrics.
Inventory
Measure inventory efficiency, stock movement, replenishment requirements and the capital invested in products.
Finance
Analyze cash flow, working capital, break-even requirements, profit forecasts and business runway.
Ecommerce
Estimate platform fees, store profit, marketplace costs and fulfillment economics across ecommerce channels.
Customer
Measure customer value, retention, loyalty and long-term customer profitability across the entire customer lifecycle.
Start with the calculators that drive profitable growth.
Discover six of the most useful calculators for ecommerce businesses. Measure profitability, pricing, marketing performance, customer value and ecommerce economics before exploring the complete library.
Profit Margin
Calculate gross and net profit margins using revenue, product costs and operating expenses.
Gross Margin
Measure the percentage of revenue remaining after Cost of Goods Sold is deducted.
Shopify Profit
Estimate store profit after product costs, refunds, discounts, fees, shipping and advertising.
Break-even
Calculate the sales volume or revenue required to cover fixed and variable business costs.
ROAS
Compare advertising revenue with campaign spend and evaluate return on advertising investment.
Customer Lifetime Value
Estimate the total profit a customer is expected to generate throughout their relationship with your business.
Measure how much your business actually earns.
Revenue is only the starting point. Explore these calculators to measure profit, margins, product economics and the real financial performance of your business.
Profit Margin
Calculate profit margin using revenue, business costs and total retained profit.
Profit ÷ Revenue × 100Gross Margin
Measure the percentage of sales revenue remaining after Cost of Goods Sold.
Gross Profit ÷ Revenue × 100Gross Profit
Calculate the money remaining after direct product or production costs are deducted.
Revenue − Cost of Goods SoldNet Profit
Calculate the final earnings retained after direct, operating and other expenses.
Revenue − Total ExpensesOperating Margin
Measure operating profit as a percentage of revenue before interest and taxes.
Operating Income ÷ Revenue × 100Contribution Margin
Measure how much revenue remains after variable costs to cover fixed costs and profit.
Revenue − Variable CostsProduct Profit
Calculate product-level profit after unit costs, fees, shipping and marketing expenses.
Product Revenue − Product CostsCOGS
Calculate Cost of Goods Sold using beginning inventory, purchases and ending inventory.
Beginning Inventory + Purchases − Ending InventoryProfit Per Order
Calculate the average profit retained from each order after product and operating costs.
Total Profit ÷ Number of OrdersBuild prices that protect your margin.
Strong pricing starts with understanding costs, margins and break-even targets. These calculators help you set profitable prices instead of simply increasing sales volume.
Markup
Calculate the percentage added to product cost when setting a selling price.
(Selling Price − Cost) ÷ Cost × 100Selling Price
Calculate the selling price required to achieve a target markup or profit margin.
Cost ÷ (1 − Target Margin)Discount
Calculate sale prices, discount amounts and the percentage reduction from the original price.
Original Price × Discount PercentageBreak-even
Calculate the sales volume or revenue required to cover fixed and variable business costs.
Fixed Costs ÷ Contribution per UnitMeasure growth without losing sight of profit.
Use these marketing calculators to measure advertising performance, customer acquisition costs, campaign profitability and revenue efficiency. Build sustainable growth strategies using practical ecommerce metrics.
ROAS
Measure the revenue generated for every unit of currency invested in advertising.
Advertising Revenue ÷ Ad SpendBreak-even ROAS
Calculate the minimum advertising return required to cover costs without losing money.
1 ÷ Contribution MarginCustomer Acquisition Cost
Measure the average marketing and sales cost required to acquire one new customer.
Acquisition Spend ÷ New CustomersCost Per Click
Calculate the average advertising cost paid for each campaign click.
Ad Spend ÷ ClicksCost Per Mille
Calculate the advertising cost required to generate one thousand impressions.
Ad Spend ÷ Impressions × 1,000Cost Per Purchase
Calculate the average advertising cost required to generate one completed purchase.
Ad Spend ÷ PurchasesROI
Calculate the percentage return generated by an investment after deducting its total cost.
Net Return ÷ Investment Cost × 100Return On Marketing Investment
Measure the profit generated by marketing activity compared with its total cost.
(Marketing Profit − Spend) ÷ Spend × 100MER
Measure total business revenue generated for every unit of currency spent on marketing.
Total Revenue ÷ Total Marketing SpendConversion Rate
Calculate the percentage of visitors who complete a purchase or another target action.
Conversions ÷ Visitors × 100Revenue Per Session
Measure the average revenue generated from every website session.
Revenue ÷ SessionsRevenue Per Visitor
Measure the average revenue generated by each unique website visitor.
Revenue ÷ VisitorsTurn stock into cash more efficiently.
Inventory ties up working capital before it generates revenue. Use these calculators to measure stock efficiency, plan replenishment and make more sustainable purchasing decisions.
Inventory Turnover
Measure how many times average inventory is sold and replaced during a reporting period.
Cost of Goods Sold ÷ Average InventoryEconomic Order Quantity
Calculate the order quantity that balances inventory ordering costs and annual holding costs.
√((2 × Demand × Order Cost) ÷ Holding Cost)Reorder Point
Calculate the inventory level at which a new purchase order should be placed.
Lead Time Demand + Safety StockSafety Stock
Estimate the additional inventory needed to reduce stockout risk during demand or lead-time changes.
Maximum Usage × Maximum Lead Time − Average Usage × Average Lead TimeDays Inventory Outstanding
Estimate the average number of days inventory remains in stock before being sold.
Average Inventory ÷ COGS × Number of DaysSell-Through Rate
Measure the percentage of received inventory sold during a selected reporting period.
Units Sold ÷ Units Received × 100Turn financial assumptions into clearer business plans.
Use these finance calculators to evaluate liquidity, working capital, break-even requirements, future profitability and the financial resources needed to grow your business.
Cash Flow
Calculate the net movement of cash entering and leaving a business during a selected period.
Cash Inflows − Cash OutflowsWorking Capital
Measure the short-term financial resources remaining after current liabilities are deducted.
Current Assets − Current LiabilitiesBreak-even Units
Calculate how many units must be sold to cover fixed and variable business costs.
Fixed Costs ÷ (Selling Price − Variable Cost)Profit Forecast
Estimate future profit using expected revenue, cost assumptions and operating expenses.
Forecast Revenue − Forecast CostsBusiness Runway
Estimate how many months a business can continue operating using its available cash balance.
Available Cash ÷ Monthly Net BurnMeasure the real economics behind online selling.
Ecommerce revenue is reduced by product costs, platform fees, payment processing, fulfillment, advertising, discounts and refunds. Use these tools to understand what remains after those expenses.
Shopify Profit
Estimate store profit after product costs, discounts, refunds, fees, shipping and advertising.
Revenue − COGS − Store and Selling CostsShopify Fees
Estimate Shopify payment processing and transaction fees based on sales and order assumptions.
Payment Fees + Transaction FeesAmazon FBA Fees
Estimate referral, fulfillment, storage and other costs associated with Amazon FBA sales.
Referral Fees + Fulfillment Fees + Storage CostsMarketplace Fees
Estimate commission, transaction, listing and payment costs charged by online marketplaces.
Commission + Transaction Fees + Fixed FeesWooCommerce Profit
Estimate store profit after product, payment, shipping, advertising and operating costs.
Revenue − Product Costs − Ecommerce ExpensesOrder Fulfillment Cost
Calculate the average cost of picking, packing, packaging, handling and shipping each order.
Total Fulfillment Costs ÷ Fulfilled OrdersMeasure the customers that build long-term profit.
Understand customer value, retention, purchasing behavior and acquisition recovery. Use these calculators to build sustainable growth by improving customer quality instead of only increasing traffic.
Average Order Value
Calculate the average revenue generated by each completed customer order.
Total Revenue ÷ Number of OrdersCustomer Lifetime Value
Estimate the total revenue or gross profit generated by an average customer over time.
Order Value × Purchase Frequency × Customer LifespanLTV:CAC Ratio
Compare customer lifetime value with acquisition cost to evaluate growth sustainability.
Customer Lifetime Value ÷ CACPurchase Frequency
Calculate how often the average customer places an order during a selected period.
Total Orders ÷ Unique CustomersRepeat Purchase Rate
Measure the percentage of customers who return and place at least one additional order.
Repeat Customers ÷ Total Customers × 100Customer Retention Rate
Calculate the percentage of customers retained by your business over a selected period.
(Ending Customers − New Customers) ÷ Starting Customers × 100Customer Churn Rate
Measure the percentage of customers lost during a selected reporting period.
Lost Customers ÷ Starting Customers × 100Customer Payback Period
Estimate how long it takes to recover customer acquisition cost through gross profit.
CAC ÷ Monthly Gross Profit per CustomerPractical tools built for clearer business decisions.
MarginLab calculators are designed to make important business metrics easier to understand and faster to apply. Each tool combines a focused calculation with practical context for ecommerce, retail and growing businesses.
Clear business calculations
Each calculator focuses on a specific metric, so users can move from inputs to a useful result without unnecessary complexity.
- Clear input labels and business terminology
- Immediate results and practical outputs
- Formulas explained in plain language
Designed for real decisions
The tools are built around common business questions involving profitability, pricing, marketing, inventory and financial planning.
- Compare alternative business scenarios
- Test assumptions before taking action
- Identify the metrics that require attention
Free and easy to use
The calculator library is available without signup, allowing businesses to access useful tools whenever a decision needs to be checked.
- No account required
- No calculator usage limits
- Responsive across desktop and mobile
An expanding resource library
New calculators will continue to be added across finance, ecommerce, inventory, pricing, marketing and operational planning.
- New tools added regularly
- Broader business categories over time
- Connected guides and educational resources
Enter your data
Add the values requested by the calculator using the same reporting period and consistent assumptions.
Review the result
Use the calculated metric, supporting values and business context to understand what the numbers indicate.
Compare scenarios
Adjust costs, prices, margins or performance assumptions to evaluate different possible outcomes.
Common questions about the calculator library.
Learn how the MarginLab calculators work, what information they require and how to interpret the results when making business decisions.
Yes. The calculators are available free of charge and do not require account registration. You can use them to test different assumptions and business scenarios whenever needed.
No. You can open and use the available calculators without creating an account, submitting an email address or starting a subscription.
No. Most tools are designed for ecommerce businesses, retailers, brands, service businesses and other companies that need to evaluate profitability, pricing, marketing or financial performance.
Only calculators explicitly labelled as Shopify tools are specific to the Shopify platform.
The calculations follow the formulas shown inside each tool. The reliability of the result depends on the accuracy and completeness of the values entered.
Missing costs, inconsistent reporting periods or unrealistic assumptions can make the result less useful for decision-making.
Yes. They can help you compare scenarios, estimate the effect of changes and understand important business metrics.
They should be treated as practical planning tools rather than a replacement for accounting, tax, investment or professional financial advice.
Yes. We regularly expand the library with new calculators covering profitability, pricing, marketing, inventory, finance and ecommerce.
New tools are published as soon as they are ready, giving businesses access to an ever-growing collection of practical resources.
The free web calculators are designed to perform calculations directly from the information entered on the page. Do not enter confidential or personally sensitive information that is not required for the calculation.
The free calculators help you evaluate one metric or business scenario at a time using manually entered values.
MarginLab automatically analyzes your Shopify store, monitors profitability, detects profit leaks, tracks margin trends and provides AI-powered recommendations to help you make better business decisions.
Calculate one metric. Monitor your whole store.
Free calculators help you understand individual business metrics and test different scenarios. MarginLab takes the next step by automatically analyzing your Shopify store, monitoring profitability, detecting profit leaks and delivering AI-powered recommendations that help you make better decisions every day.