Free Business Calculators

Accurate, no-signup calculators for tax planning, pricing, and financial analysis. Built for US small businesses, freelancers, and solopreneurs.

Tax Calculators

Calculate your SE tax including Social Security, Medicare, and the employer-half deduction.

Figure out your quarterly payments with safe harbor rules and penalty estimates.

Compare your tax bill as a default LLC versus S-Corp election.

Compare simplified vs regular method and see which saves you more.

Compare the total cost of hiring a contractor versus an employee.

Estimate your total deductions and tax savings across all categories.

Check which states you have economic nexus in based on sales thresholds.

Compare the true cost of DIY, software, AI, freelance, and in-house bookkeeping.

Calculate gross, operating, and net profit margins plus markup equivalents.

Find your break-even point in units and revenue.

Calculate your minimum hourly rate based on income goals, expenses, and taxes.

Project your cash position week by week for the next 13 weeks.

Instantly convert between markup percentage and profit margin.

Calculate late fees on overdue invoices with different fee structures.

BookkeepingFlow automates tax estimates, expense tracking, and financial reporting.

No credit card required. We'll notify you when we launch.