E-commerce & Payments
Estimate marketplace, payment, royalty, and seller economics.
Explore 19 tools →Practical decisions, visible math
Business calculators that show their work
Plan prices, profit, fees, growth, staffing, and operations with audited formulas, editable assumptions, dated sources, and no account.
108public calculators
56supporting guides
7business categories
All calculations run locally in your browser.
Seven focused collections
Choose a business area
Marketing & Growth
Measure acquisition, audience performance, conversion, and campaign returns.
Explore 17 tools →Operations & HR
Manage inventory, staffing, workforce, and working-capital decisions.
Explore 9 tools →Pricing, Profit & Valuation
Price products, understand margin, compare returns, and model value.
Explore 13 tools →Restaurant & Hospitality
Plan menu, labor, tips, inventory, and operating performance.
Explore 15 tools →SaaS Metrics
Model recurring revenue, retention, cash efficiency, and unit economics.
Explore 15 tools →Service Business Pricing
- Junk Removal Cost Calculator
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Tools and resources
Trust Page About About this project Calculator Hub Business Calculators Business calculators Top-level Hub E-commerce & Payments E-commerce & Payments Calculator eBay Fee Calculator eBay Fee Calculator Calculator eBay Profit Calculator eBay Profit Calculator Calculator PayPal Fee Calculator PayPal Fee Calculator Top-level Hub Marketing & Growth Marketing & Growth Calculator CPM Calculator CPM Calculator Calculator Engagement Rate Calculator Engagement Rate Calculator Top-level Hub Operations & HR Operations & HR Top-level Hub Pricing, Profit & Valuation Pricing, Profit & Valuation Calculator Business Valuation Calculator Business Valuation Calculator Calculator Commission Calculator Commission Calculator Calculator Gross Profit Calculator Gross Profit Calculator Calculator Margin Calculator Margin Calculator Calculator Markup Calculator Markup Calculator Top-level Hub Restaurant & Hospitality Restaurant & Hospitality Calculator Food Cost & Menu Pricing Calculator Food Cost & Menu Pricing Calculator
Browse homepage tools for U.S. businesses with transparent formulas, worked examples, editable assumptions, clear source notes and related practical guides.
This page organizes the calculators and guides in the audited launch architecture. Every calculator shows its inputs, method, worked example, assumptions, and source notes.