How to Calculate Conversion Rate
A clear guide to conversion rate formulas for websites, retail, sales teams and marketing campaigns.
en-US
US Calculators
Use this page for calculators that are broadly useful in the United States, plus guides for borrowing, debt payoff, fitness, home projects and business planning.
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Recommended calculators
These tools cover common regional planning questions and show the assumptions that can change the result.
FinanceMortgage AffordabilityEstimate a property budget from household income, deposit, monthly debts and an income multiple.FinanceRent AffordabilityCompare rent, bills and take-home income to estimate a comfortable monthly housing share.BusinessConversion RateCalculate website, ecommerce, sales, retail or marketing conversion rate, plus target uplift and value per visitor.BusinessCost Per ConversionCalculate cost per conversion, CPA, conversion rate, revenue per conversion and ROAS from campaign spend and conversions.BusinessCPCCalculate CPC, cost per click, CPM, CTR, cost per conversion and ROAS from paid campaign data.FinanceEmergency FundEstimate how much emergency cash to hold and how long it may take to reach your target.
Guides
Helpful background before you calculate
Read the background, choose better inputs and compare scenarios with more confidence.
Cost Per Conversion Formula
How to calculate cost per conversion, CPA and break-even acquisition cost from campaign spend and conversions.
How Much Rent Can I Afford?
A practical way to compare rent, bills, income, debt payments and the money left for savings and everyday life.
Market notes
Use the local context, then check the specific rule
Some calculators are universal because the arithmetic is the same. Others depend on tax rules, lender terms or product charts, so the assumptions matter.
- General finance calculators use the numbers you enter and do not assume state-specific tax rules.
- Health calculators use recognised public formulas, with clear limits beside each result.
- Unit conversion tools include US liquid gallons where relevant.