Free Business Calculators
30 free calculators for small business owners
Quick financial calculations shouldn't require a CPA or a complicated spreadsheet. Whether you need to figure out your profit margin, estimate quarterly taxes, or calculate how long your runway lasts, these free calculators give you instant answers with clear explanations of the math behind each number.
Every calculator includes the formula, a step-by-step walkthrough, a worked example with real numbers, and practical tips for applying the result to your business decisions. For automated calculations that update in real-time as your finances change, try FiscalInsights free for 14 days.
profitability
pricing
freelance
taxes
Freelance Tax Calculator
Calculate estimated quarterly taxes including self-employment tax for freelancers.
Quarterly Tax Calculator
Estimate quarterly estimated tax payments for self-employed individuals.
Self-Employment Tax Calculator
Calculate Social Security and Medicare taxes for self-employed income.
Sales Tax Calculator
Calculate sales tax for any US state or locality. Find rates and totals.
Payroll Tax Calculator
Calculate employer payroll tax obligations including FICA and FUTA.
Home Office Calculator
Calculate home office deduction using simplified or regular method.