Methodology
How Our Calculators Work
Transparent formulas, user controlled assumptions and clear limits.
Formula calculators
Formula calculators use direct arithmetic. Examples include ROAS (revenue divided by ad spend), conversion rate (conversions divided by visitors or clicks), work hour totals and digital product profit.
Scenario calculators
Scenario tools do not predict the future. They apply the assumptions you enter to a mathematical model. Where we provide convenience presets, those presets are labeled as scenarios rather than universal market benchmarks.
Taxes and changing rates
Tax calculators require periodic maintenance because laws, brackets, deductions, wage bases and local rules change. Pages that include tax estimates are labeled with the applicable year or date and explain major exclusions.
AI prices and platform economics
Where prices can change frequently, we prefer user entered pricing rather than permanently hard coding a provider price. This is why the AI Token Cost Calculator asks you to enter the current input and output token price.
Rounding
Display values are generally rounded for readability. Internal calculations may retain additional precision before the result is displayed.
Corrections and updates
If you identify a possible error, contact us with the calculator name, inputs and expected result. We review formula issues separately from differences caused by assumptions or external rules.
How we think about calculator quality
Calculator quality has two parts: the arithmetic must match the stated formula or model, and the page must make the inputs understandable. We review labels, units, default values, formula descriptions and output labels together. When a calculator models a scenario rather than measuring a fact, the result is identified as an estimate.
Inputs and units
Inputs should state the unit they expect. When time periods matter, the calculator and explanation should make clear whether the values are hourly, weekly, monthly or annual. When a tool supports more than one measurement system, values should be converted consistently rather than mixing units inside the same calculation.
Assumptions
Some calculators require assumed rates, future prices, activity levels, growth, costs or other variables that cannot be known in advance. We treat those values as assumptions and encourage scenario comparison. Changing one major assumption at a time makes it easier to understand why the result moved.
Limitations
General calculators cannot reproduce every contract, tax situation, medical circumstance, lender rule, product specification or local regulation. Pages in those categories include limitations and direct users to current official or professional information when the decision depends on details outside the calculator.
Editorial review
Supporting explanations are written to clarify the calculation rather than to repeat the same generic text across the site. Our Editorial Standards describe how calculator pages and educational guides are reviewed and updated.