This page explains how Borkish calculators handle formulas, inputs, examples, currencies, rounding and limitations.
Formula-first design
Every calculator has a defined formula stored with the tool. The visible formula on the page describes the arithmetic used by the calculator. We test each tool with default input values and an expected output before treating the tool as production-ready.
Input definitions
Users should keep inputs on the same basis and reporting period. For example, campaign revenue and ad spend should use compatible attribution windows; order and customer counts should refer to the same date range; monthly and annual figures should not be mixed unless the formula explicitly converts them.
Currency handling
Currency-enabled calculators can change the displayed currency symbol. They do not fetch foreign-exchange rates and do not convert money between currencies. All monetary inputs should therefore use the same currency.
Rounding
Calculator outputs may be rounded for readable display. Small differences can occur when another platform rounds intermediate values differently.
Worked examples
Default values are demonstration inputs. Worked examples are provided to show how the formula behaves, not to suggest a recommended business target.
Benchmarks and interpretation
There is rarely one universal “good” result. Useful benchmarks depend on industry, margin, channel, geography, attribution rules, customer mix and business goals. Compare results with your own historical data and clearly defined targets.
Limitations
A calculator only uses the inputs included in its formula. It cannot automatically account for every tax rule, fee, attribution setting, refund, overhead, qualitative factor or future change affecting a real business decision.