EVERY LEGAL & BUSINESS DECISION · WITH THE MATH SHOWN

Legal & Business Calculators

From break-even and profit margins to LLC costs and child support — calculators for entrepreneurs, freelancers, small business owners, and anyone navigating legal finances.

Start with Break-Even Calculator →
  • Break-Even Calculator

    Popular

    Units sold and revenue needed to cover fixed and variable costs — for any business model.

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  • Profit Margin Calculator

    Gross, operating, and net profit margins — and markup vs margin explained.

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  • Markup Calculator

    Selling price from cost and markup percentage — or reverse-calculate your margin.

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  • Pricing Strategy Calculator

    Cost-plus, value-based, and competitive pricing with margin analysis.

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  • Sales Tax Calculator

    Add or strip sales tax from any price by state or custom rate.

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  • Invoice Calculator

    Subtotal, tax, discounts, and total for a client invoice — with line item breakdown.

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  • Invoice Late Fee Calculator

    Late payment interest and penalty amount based on outstanding balance and days overdue.

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  • Tip Calculator

    Tip amount and total bill split evenly or custom per person.

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  • Commission Calculator

    Commission payout for any rate and sale amount — tiered or flat.

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  • Hourly Rate Calculator

    What to charge per hour as a freelancer or consultant — accounting for taxes and expenses.

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  • Project Pricing Calculator

    Fixed-price project quote from hours, rate, overhead, and profit target.

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  • Employee Cost Calculator

    True cost to hire an employee: salary + payroll taxes + benefits + overhead.

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  • Contractor vs Employee

    True cost comparison — when hiring a W2 vs 1099 actually makes financial sense.

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  • Overtime Calculator

    Overtime pay for hourly or salaried employees under FLSA rules.

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  • Payroll Tax Calculator

    Employer + employee FICA, FUTA, SUTA, and withholding by state.

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  • Business Loan Calculator

    Monthly payments, total interest, and APR on a term loan or line of credit.

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  • Business Expense Calculator

    Categorize and total business expenses — with deductibility flags for tax planning.

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  • Quarterly Tax Calculator

    Estimated quarterly tax payments for self-employed and business owners.

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  • Freelance Tax Calculator

    SE tax, income tax, and quarterly payments for freelancers — all in one place.

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  • Profit Sharing Calculator

    Employee profit sharing distributions by formula — equal, salary-weighted, or tiered.

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  • Revenue Forecast Calculator

    Monthly and annual revenue projection from growth rate, price, and volume assumptions.

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  • Business Valuation Calculator

    What's your business worth? Earnings multiplier, DCF, and asset-based methods.

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  • Inventory Turnover Calculator

    How fast you sell through inventory — with benchmarks by industry.

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  • AI Savings Calculator

    Estimate cost savings and ROI from adopting AI tools in your business.

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  • Depreciation Calculator

    Straight-line, double-declining, and MACRS depreciation schedules for any asset.

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  • LLC Cost Calculator

    Total cost to form and maintain an LLC — filing fees, registered agent, and annual reports by state.

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  • Incorporation Cost Calculator

    Corporation formation costs by state — C-corp and S-corp with ongoing compliance fees.

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  • C-Corp vs S-Corp Calculator

    Tax comparison between C-corp and S-corp structures at various income levels.

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  • S-Corp vs LLC Calculator

    Self-employment tax savings of electing S-corp vs staying a single-member LLC.

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  • Business License Cost Calculator

    Estimate business license fees by business type, state, and city.

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  • Registered Agent Calculator

    Annual registered agent cost by state — and whether to use a service or serve yourself.

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  • Partnership Agreement Calculator

    Equity split and profit distribution for business partnerships — cap table basics.

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  • Liability Insurance Calculator

    Estimated general liability and professional liability premiums by business type and revenue.

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  • Business Insurance Calculator

    Estimate premiums for general liability, E&O, and cyber coverage by industry.

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  • Workers' Comp Calculator

    Annual workers' comp premium by payroll, classification code, and state rate.

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  • Trademark Cost Calculator

    USPTO filing fees, attorney costs, and maintenance fees over a trademark's lifecycle.

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  • Patent Cost Calculator

    Provisional and non-provisional patent costs — USPTO fees plus typical attorney fees.

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  • Court Fee Calculator

    Filing fees for civil, small claims, and federal court by jurisdiction and claim amount.

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  • Settlement Calculator

    Net settlement value after attorney contingency fees, medical liens, and taxes.

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  • Child Support Calculator

    Estimated child support by state guidelines — income shares or percentage-of-income model.

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  • Alimony Calculator

    Spousal support estimate by marriage length, income gap, and state guidelines.

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  • Business Name Checker

    Availability signals for your business name — domain, trademark, and state entity checks.

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Related money decisions
  • Tax Calculators
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  • Business & Marketing
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  • Personal Finance
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  • All Calculators
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Written and maintained by Jere Salmisto, Founder, CalcFi. Updated May 12, 2026.

Formulas cited to primary US government and regulatory sources. Methodology at /about/editorial. Published by CalcFi Editorial.