Calculation Methodology
See the formulas, rounding approach, privacy choices and editorial principles used by Sahvion Calculators.
How the calculators are built
Each tool starts with a commonly used business or advertising formula. The calculator then applies that formula to the numbers you enter. The result is intended for planning, education and quick checks rather than formal accounting.
Input handling
Current calculators perform arithmetic in the browser with JavaScript. Values entered into calculator fields are not intentionally submitted to a Sahvion Calculators database as part of the calculation itself.
Rounding
Currency outputs are generally displayed to two decimal places. Rates and ratios are rounded for readability. The underlying browser calculation may retain additional decimal precision before display.
Formula scope
ROAS: attributed revenue ÷ advertising spend.
CPA: advertising spend ÷ conversions.
Conversion rate: conversions ÷ clicks × 100.
Break-even ROAS: 1 ÷ contribution margin, where contribution margin is the amount left from selling price after the variable costs entered.
Break-even CPC: conversion rate × maximum CPA.
Profit margin: profit ÷ revenue × 100.
Markup: (selling price − cost) ÷ cost × 100.
Why results can differ from ad platforms or accounting software
Advertising platforms can use different attribution windows, conversion definitions, time zones and modeling. Accounting systems can use different revenue recognition and cost classifications. A calculator is only consistent with the definitions and inputs you give it.
Review process
Calculator formulas and explanatory copy are reviewed when a tool is created and should be rechecked when functionality is changed. We welcome correction requests through the contact page.
No benchmark promises
We intentionally avoid promising that a particular ROAS, CPA, CPC or conversion rate is “good” for every business. The sustainable target is determined by your own margin, goals, cash flow and customer economics.