About GigMath

GigMath is a small, independent collection of free calculators for freelancers, contractors and self-employed people in the United States and the United Kingdom.

Freelancers deal with numbers employees never see: platform commissions, withdrawal fees, self-employment tax, quarterly payments, unpaid time off. Most online answers are scattered across long articles. GigMath turns them into simple tools that give a clear answer in seconds and show exactly how it was worked out.

How we keep it accurate

• Every calculator is based on official sources (IRS, SSA, GOV.UK/HMRC) or the platform's own published fees, linked at the bottom of each page.
• Rates are reviewed when they change, usually at the start of each tax year, and each page shows when it was last updated.
• Formulas are explained on every page, so you can check the math yourself.

Your privacy

All calculations run in your own browser. We don't ask for an account and we never see or store the numbers you type.

Important

GigMath provides estimates for planning only. It is not a tax adviser, accountant or financial adviser. For decisions about your own situation, talk to a qualified professional.

Found a mistake or want a new calculator? Get in touch.