Free business tools
Use available ROI, marketing, SaaS, ecommerce, real estate, restaurant, and investment calculators without paying.
Practical numbers for better business decisions
Business calculations should feel clear, not complicated.
SolveIndex turns important business metrics into fast, understandable calculators and practical guides for founders, marketers, ecommerce teams, SaaS companies, investors, and small business owners.
Free to useNo signup for basic calculationsBrowser-first calculationsPractical formulas
Why SolveIndex exists
From scattered spreadsheets to one focused decision toolkit
Important decisions often depend on metrics such as ROI, profit margin, ROAS, payback period, cash flow, cap rate, customer acquisition cost, churn, and revenue growth. The math is useful, but the process can be slow when formulas, assumptions, and explanations are spread across spreadsheets and different websites.
SolveIndex brings those calculations into one consistent platform. Each tool is designed around a real business question so you can enter your numbers, understand the formula, review the result, and move forward with better context.
Designed for real use
What makes SolveIndex different
The platform is built around practical business decisions, not generic arithmetic.
Decision-focused outputs
Results emphasize metrics that matter in practice, including ROI, ROAS, profit, margin, payback, CAC, LTV, cash flow, and cap rate.
Transparent formulas
Calculators include formula explanations, examples, assumptions, and supporting guidance so the number has context.
Browser-first calculations
Basic calculator inputs are processed in your browser. Signed-in features can save eligible history and reports when you choose to use them.
Built across business niches
One familiar interface covers marketing, ecommerce, SaaS, software, investment, real estate, restaurants, and other business-use cases.
Responsive by design
Tools, guides, tables, charts, and result summaries are designed to remain usable across phones, tablets, laptops, and desktops.
A simple workflow
From inputs to insight in four steps
Choose the decision
Start with the calculator that matches the question you are trying to answer.
Enter your real inputs
Use your own costs, revenue, rates, time periods, or operating assumptions.
Review the calculation
See the headline result together with supporting metrics, formulas, charts, and breakdowns.
Use the context
Read the matching guide and compare scenarios before making an important business decision.
Explore SolveIndex
Tools for the metrics businesses actually track
ROI & InvestmentROI CalculatorReturn, gain, cost and profitabilityMarketingMarketing ROISpend, revenue, margin and returnPaid AcquisitionGoogle Ads ROIROAS, CPA and break-even performanceSaaSSaaS ROISubscription cost and business valueSaaS Unit EconomicsLTV:CAC CalculatorLTV, CAC, payback and efficiencyEcommerceEcommerce ROIRevenue, COGS, ads and net marginReal EstateRental Property ROICash flow, cap rate and cash-on-cash returnRestaurantRestaurant ROIOperating costs, profit and payback
Who it is built for
Useful whether you manage one campaign or an entire business
SolveIndex is designed for people who need quick, understandable calculations without building a new spreadsheet for every question.
Small business ownersStartup foundersSaaS teamsDigital marketersSEO professionalsGoogle Ads specialistsEcommerce sellersShopify operatorsAgenciesReal estate investorsRestaurant ownersFinance students
Accuracy & responsibility
Useful estimates, with the assumptions kept visible.
SolveIndex calculators use established business and financial formulas for informational and educational purposes. Results depend on the values you enter and should be treated as estimates, not guaranteed outcomes.
Important
SolveIndex does not provide financial, tax, legal, accounting, or investment advice. For major decisions, use the calculator as a planning aid and consult a qualified professional when appropriate.
Read our Terms of Use →Help us make the library better
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Choose the right SolveIndex inbox and send the details directly to the team.