Contribution Margin Calculator
Estimate how much each sale contributes after variable costs.
Open toolFinancial planning
Finance Calculators for Small Businesses
Understand how revenue, variable cost and fixed commitments interact. Results are planning estimates, with assumptions shown below each calculator.
Calculators
Choose the calculation you need
Every tool includes its formula, assumptions and practical limits.
Break-Even Point Calculator
Find the number of units needed to cover fixed costs.
Open toolROI Calculator
Calculate return on investment from the amount invested and the final value or proceeds.
Open toolBusiness Loan Calculator
Estimate a fixed monthly business-loan payment, total interest and total repayment.
Open toolCompound Interest Calculator
Project future value from a starting balance, regular monthly contributions and compound growth.
Open toolSales Tax Calculator
Add sales tax to a pre-tax price or separate tax from a tax-inclusive total.
Open toolGuides
Understand the decision
Learn how to apply the formula to a real seller decision.
Etsy seller profitEtsy Fees, Profit and Pricing: A Practical Seller GuideBuild an Etsy price from real order economics instead of subtracting one headline fee from revenue.→Customs and logisticsHS Codes, Import Duty and Landed Cost for E-commerceUnderstand what an HS code can and cannot tell you before estimating customs duty, import tax and product landed cost.→PricingMargin vs. Markup: The Pricing Difference Sellers Must KnowA practical explanation of why a 50% markup is not a 50% margin, with examples for small sellers.→E-commerceHow to Calculate True Profit per OrderA step-by-step order profit method that includes product cost, shipping, ad spend, platform fees and returns.→