One toolkit / every working number
The right calculator,right when you need it.
Business, freelance, and marketing calculators that show the formula—not just the answer.
Profit marginBusinessExplore toolBreak-evenBusinessExplore toolReturn on investmentBusinessExplore toolLoan paymentBusinessExplore toolCompound interestBusinessExplore toolMarkupBusinessExplore toolCash flowBusinessExplore toolBudgetBusinessExplore toolHourly rateFreelanceExplore toolProject priceFreelanceExplore toolTax set-asideFreelanceExplore toolInvoice totalFreelanceExplore toolROASMarketingExplore toolConversion rateMarketingExplore toolAcquisition costMarketingExplore toolCost per clickMarketingExplore tool
Built to grow cleanly
One calm system for every calculation
Twenty-five focused tools share one tested interaction pattern, transparent formulas, worked examples, and clear limitations.
Business calculators
Understand pricing, profitability, growth, and the economics behind everyday business decisions.
10 calculators
Freelance calculators
Turn income goals, time, rates, and project costs into clearer working numbers.
8 calculators
Marketing calculators
Measure campaign costs and outcomes without hiding the formula behind the result.
7 calculators
Why these calculators are trustworthy
Calculator standard
Formula first
Every result is backed by a visible formula and a worked example.
Calculator standard
Private by default
Calculations run in the browser with no account or data upload.
Calculator standard
Useful, not padded
Each tool gets specific guidance instead of duplicated filler.