Financial Calculators

Free calculators for ad spend, rental property yield and self-employment tax, each with the formula shown and a worked example.

These three calculators cover the money questions that come up most often in freelance and small-business work: what online advertising really costs, whether a rental property earns its price, and what to set aside for US self-employment tax. Each one shows the formula it uses and works an example in full, so you can check the number instead of taking it on trust.

📈 CPM CalculatorCost per thousand impressions, total spend or impressions, with CPC, CPA and CTR alongside. 🏠 Cap Rate CalculatorCap rate, property value and net operating income, with a builder that works NOI out from rent and expenses. 💼 Self-Employment Tax CalculatorSocial Security and Medicare tax on freelance or 1099 income, the deductible half, and quarterly amounts.

Which tool do I need?

CPM Calculator. if you buy or sell online ads and need cost per thousand impressions, total spend, or impressions from any two values.

Cap Rate Calculator. if you are sizing up a rental or commercial property and want to compare its yield against its price.

Self-Employment Tax Calculator. if you work for yourself in the US and want to estimate what to set aside for Social Security and Medicare tax.

Results are estimates for planning and education, based on the figures you enter. Tax rules and advertising prices change; for filing or spending decisions, confirm the numbers with a qualified professional. See our Disclaimer for what these tools can and cannot tell you.