15 free calculators
The numbers behind working for yourself
Rates, proposals, client pushback, retainers, tax, overdue invoices, runway, time loss, side-hustle viability and publishing revenue — worked out with the buffers real independent work needs. Everything runs in your browser. Nothing is stored, and there is no sign-up.
Pricing & Quoting
Work out what your time is worth before you send a number to a client.
- Freelance Rate CalculatorThe minimum hourly rate that actually supports your income target.
- Project Quote CalculatorHours, rate, scope-creep buffer and costs turned into a quote you can send.
- Interactive Proposal BuilderBuild a live pricing menu your client can tick through, then send it as one link.
- Retainer CalculatorPrice a monthly retainer and see how many cover your baseline costs.
Clients & Negotiation
What to say when a client pushes on scope, price, deadlines or payment.
Publishing & Ad Income
Turn traffic into a realistic monthly income figure instead of a guess.
Comparing Options
Put two ways of earning side by side and see the real difference.
Cash Flow & Getting Paid
Keep the tax money separate and chase what you are owed.
- Feast & Famine Salary MakerTurn wildly uneven client income into one steady amount you pay yourself monthly.
- Tax Set-Aside CalculatorSplit each payment the moment it lands so the tax money is never spent.
- Invoice Late Fee CalculatorLate fee, daily interest and a copy-ready reminder for an overdue invoice.
Planning Ahead
Time off, quiet months and gaps between clients don't fund themselves.
Is This Worth It?
Honest diagnostics on whether a side project, or the hours it eats, is paying you back.
Publishing your own site instead?
SideGigArt also covers the technical side of running a site that earns: a free AdSense readiness audit, a policy checklist, a crawl map of how pages link together, transparent search data, rejection guidance and in-depth publishing guides.