Business Calculator Guides & Resources

CalcBundle offers more than 65 free business and finance calculators — no signup, no spreadsheet, no subscription. Each calculator runs entirely in your browser and explains its methodology so you can understand and verify the result. The tools cover six core areas: business valuation and profitability, startup and SaaS metrics, e-commerce and Amazon FBA, real estate investment, personal investing and compound growth, and US income and capital gains taxes. This page organises those calculators by the question they answer, so you can go straight to the tool that fits your situation. If you are pricing a new product, start with the break-even calculator. If you are preparing to sell a business or raise a funding round, start with the valuation calculators. If you are modelling an Amazon listing, start with the FBA profit calculator. All tools are free and updated quarterly when reference data — such as tax brackets or Amazon fee tables — changes.

Business valuation & worth

How much is your business worth? Most small businesses are valued as a multiple of Seller's Discretionary Earnings (SDE) — net profit plus owner's salary and non-cash expenses. The multiple depends on your industry, growth rate, and recurring-revenue profile. Larger or private-equity-targeted businesses use EBITDA multiples instead.

• Business Valuation Calculator — estimate value using EBITDA and revenue multiples adjusted for growth and risk.
• Small Business Valuation Calculator — SDE-based valuation for owner-operated businesses, with industry multiple ranges.
• SDE Calculator — calculate Seller's Discretionary Earnings by adding back owner compensation and non-cash expenses.
• EBITDA Calculator — work out EBITDA and EBITDA margin from net income or operating profit.
• Company Valuation Calculator — blend revenue, EBITDA and SDE methods for an established company.
• Startup Valuation Calculator — ARR and revenue multiples for early-stage companies raising a funding round.

Profit, margins & break-even

Understanding your profit layers — gross, operating, and net — is the foundation of good pricing and cost decisions. The break-even point tells you the minimum sales volume needed before you make any money; knowing it is essential before any pricing change, new product launch, or cost increase.

• Business Profit Calculator — split revenue and expenses into gross profit, operating profit and net profit with margins.
• Break-Even Calculator — find the exact units and revenue needed to cover costs, with a break-even chart.
• Business Margin Calculator — calculate gross margin, operating margin and net margin side by side.
• Gross Margin Calculator — fast gross margin and markup from revenue and COGS.
• Profit Margin Calculator — net profit margin from revenue and total costs.

Return on investment & cash flow

Before committing capital — to a hire, piece of equipment, marketing campaign or acquisition — calculate the expected return. A positive ROI is necessary but not sufficient: also consider the payback period and what else you could do with the same money.

• Business ROI Calculator — total ROI, annualized ROI and payback period for any business investment.
• Cash Flow Calculator — project net cash flow and ending balance from operating, investing and financing activities.
• Revenue Projection Calculator — project revenue 1–10 years ahead and calculate CAGR from historical figures.

Business loans & financing

Before taking on debt, model the full cost. Even a small difference in interest rate or term significantly changes total repayment. Use these calculators before negotiating with a lender.

• Business Loan Payment Calculator — monthly payment, total interest and full amortization schedule.
• Business Loan Calculator — work backwards: what loan amount can you afford at a given rate and term?

Startup & SaaS metrics

Investors will ask for CAC, LTV, runway, and burn rate before any funding conversation. Know your numbers before the meeting. For SaaS, an LTV:CAC ratio above 3:1 and a payback period under 12 months are considered strong at Series A.

• CAC Calculator — customer acquisition cost from sales and marketing spend.
• LTV Calculator — customer lifetime value from order value, frequency and churn.
• LTV:CAC Ratio Calculator — compare lifetime value to acquisition cost with benchmarks.
• Startup Runway Calculator — how many months of cash you have left from burn rate.
• Burn Rate Calculator — net monthly cash burn and cash-over-time chart.
• CAC Payback Period Calculator — months to recover acquisition cost from gross profit.
• TAM Calculator, SAM Calculator, SOM Calculator — market sizing for pitch decks.
• Post-Money Valuation Calculator — dilution and cap table impact for any funding round.

E-commerce & marketing

Marketplace fees, advertising spend, and returns can silently erase e-commerce profit. Run these calculations before setting prices or scaling ad spend.

• E-commerce Profit Calculator — net profit and margin after product, shipping, fees and advertising costs.
• Amazon FBA Profit Calculator — referral and FBA fees, margin and ROI for US, UK, CA, AU and IN.
• AOV Calculator — average order value and the revenue impact of raising it.
• ROAS Calculator — return on ad spend and break-even ROAS.
• Break-Even ROAS Calculator — the minimum ROAS needed to cover product and ad costs.
• Discount Calculator — sale price, savings and margin impact of any discount.
• Product Pricing Calculator — price from target margin or markup.

Real estate & property

• Property Cash Flow Calculator — monthly and annual rental cash flow from rent, vacancy, expenses and mortgage.
• Rental Property ROI Calculator — total ROI and cash-on-cash return on a rental investment.
• Cap Rate Calculator — capitalization rate from NOI and property value.
• DSCR Calculator — debt service coverage ratio for lenders.
• Property Appreciation Calculator — future property value at an assumed annual rate.
• House Affordability Calculator — maximum home price based on income and debts.

Investing

• Compound Interest Calculator — future value of an investment with regular contributions.
• Investment Return Calculator — total return, annualized return and growth chart.
• Lump Sum Investment Calculator — future value of a one-time investment.
• CAGR Calculator — compound annual growth rate between two values over time.
• Dividend Calculator — dividend income, yield and growth over time.
• Stock Profit Calculator — profit, loss and ROI on a stock trade including fees.
• Inflation Calculator — real purchasing power of money over time.
• Net Worth Calculator — total net worth from assets and liabilities.

Tax

• Income Tax Calculator — federal income tax, marginal rate and effective rate for US 2024 & 2025.
• Self-Employment Tax Calculator — SE tax on net self-employment earnings including the deductible half.
• Capital Gains Tax Calculator — short-term and long-term capital gains tax including NIIT.
• Take-Home Pay Calculator — net pay after federal income tax, Social Security and Medicare.
• Quarterly Tax Calculator — estimated quarterly payments for freelancers and the self-employed.
• 1099 Tax Calculator — total federal tax for 1099 contractors and gig workers.
• Payroll Tax Calculator — employer payroll tax including FICA and FUTA.
• Sales Tax Calculator — sale price plus tax or tax-exclusive price from a tax-inclusive amount.
• Tax Bracket Calculator — which bracket your income falls into and what you owe per bracket.

Frequently asked questions

How do I know which calculator to use?

Match the calculator to your question. Valuation questions (what is my business worth?) → use the business valuation or SDE calculator. Pricing questions → use break-even or profit margin. Investment decisions → use ROI or compound interest. Tax questions → use the relevant tax calculator. When in doubt, start with the break-even and profit calculators — they answer the most common questions small business owners face.

Are these calculators free?

Yes. Every calculator on CalcBundle is free to use with no account, no signup and no paywall. Results appear instantly in your browser. Nothing is stored or transmitted.

How accurate are the results?

The calculators produce accurate estimates based on the inputs you provide and standard financial formulas. They are best used for planning, pricing and scenario analysis — not for tax filings, legal filings or formal business valuations, which require a qualified professional.

What is the difference between gross profit and net profit?

Gross profit = Revenue minus cost of goods sold (COGS). It shows how efficiently you produce and sell. Net profit = Revenue minus all costs including operating expenses, interest and tax. It is what you actually keep. A business can have healthy gross margins and still lose money if operating costs are too high.

What is a good ROI for a small business investment?

Most business owners aim for at least 15–25% annual ROI on internal investments, significantly above the 7–10% long-run average of public equities. Below 15%, most capital is better deployed elsewhere. The payback period matters too: 25% ROI over 5 years is less attractive than 25% ROI over 18 months.

Where can I read more about business finance?

See our Research & Reports for data-driven articles on business finance topics. For official tax figures, see IRS.gov. For business standards, see FASB.org.