About Calculator OS

Clear answers you can understand.

Straightforward tools for contractors and independent workers.

What you can calculate

Calculator OS helps you convert hourly, daily, weekly, monthly and annual gross income. Use the tools to compare rates, explore different working patterns and plan revenue.

What each calculator shows

Every calculator explains the formula it uses, the assumptions behind the estimate and what the result does not include. Worked examples help you check how the calculation applies.

Use estimates responsibly

Results are general estimates, not financial, tax, legal or employment advice. A calculator cannot account for every contract, expense, tax position or personal circumstance.