Methodology
SmallBizMath calculators are built from transparent, documented formulas — never a black box. Each cluster has its own detailed methodology page.
Pricing Methodology
Billable hours, break-even rate, reserve and margin formulas used by every pricing calculator.
Promotions Methodology
Contribution profit, contribution margin and volume-uplift formulas used by every promotion calculator.
Shared principles across every calculator
- All math runs entirely in your browser — nothing you enter is sent to a server.
- Internal calculations preserve full floating-point precision; rounding happens only for on-screen display.
- When a result is undefined or economically nonsensical (like dividing by zero revenue), the calculator explains why instead of showing NaN, Infinity or a misleading number.
- Every calculator is a planning estimate, not tax, legal, financial or accounting advice.