Free Business Calculators

Free 2026 payroll calculator: federal withholding (Pub 15-T), Social Security, Medicare, all 50 states + DC, 401(k) and health deductions, plus employer cost.

Calculate profit margin, gross profit, and markup instantly. Or work backwards to find the selling price or maximum cost for a target margin.

Calculate selling price from cost and markup, find your markup percentage from cost and price, or work back to a maximum cost. Includes a markup-to-margin table.

Estimate 2026 self-employment tax (Social Security and Medicare), the half-SE deduction, federal income tax, and your quarterly estimated payment from Schedule C net profit.

Convert an hourly rate to an annual salary or a salary back to hourly. See weekly, biweekly, semimonthly, and monthly pay, with overtime and unpaid weeks.

Calculate your monthly business loan payment, total interest, effective APR with origination fees, and payoff date. Full amortization schedule with extra payments and weekly repayment.

Estimate SBA 7(a), 504, Express, and Microloan payments with current maximum rates (Prime 7.00%), the FY2026 guarantee fee, total interest, and effective APR.