Free Business Calculators
Tools for freelancers, contractors, and small businesses: hourly rates, project estimates, profit margin, taxes, payment terms, and more.
Freelance Hourly Rate Calculator
Find your recommended hourly rate based on desired salary, billable hours, expenses, tax, and profit margin.
Project Cost Estimator
Estimate total project cost with hours, rate, materials, contingency buffer, and tax in a clear line-item breakdown.
Late Payment Fee Calculator
Calculate interest-based late payment fees on overdue invoices and the new total amount owed.
Profit Margin Calculator
Compute gross profit and margin percentage with a visual health indicator (red / yellow / green).
Self-Employment Tax Calculator
Estimate self-employment tax, deductible portion, quarterly payment, and effective rate.
Invoice Due Date & Payment Terms Calculator
Get due date from invoice date and payment terms (Net 7/15/30/45/60/90), plus early payment discount date.
Retainer Fee Calculator
Calculate monthly retainer fee, total contract value, and savings vs. hourly billing.
Freelance Annual Income Calculator
Convert hourly or per-project earnings to annual income after expenses and estimated tax.