EveryCalc methodology

How calculators are built

Each calculator starts with a specific user task, such as estimating a mortgage payment, converting units, checking a percentage change, or planning a home project. Inputs are kept visible, formulas are implemented in code, and output labels are written so the result can be understood without creating an account or downloading a file.

Review standards

• Inputs and outputs should use plain labels and consistent units.
• Finance and planning calculators should explain assumptions and edge cases.
• Generated converter pages should include the conversion direction, factor, and related tools.
• High-impact pages should remind users to verify results before acting.
• Related calculators should help visitors continue the same workflow.

Accuracy and limitations

We aim for useful estimates, not professional advice. Some topics depend on changing laws, lender rules, tax rates, local fees, medical context, or project-specific quotes. When a result affects money, health, property, tax, or legal decisions, visitors should check the output against primary sources or a qualified professional.

Maintenance

EveryCalc is maintained as an expanding calculator library. We prioritize fixes that improve many pages at once, then enrich high-use and high-intent tools with worked examples, practical checks, category navigation, and clearer supporting content.

Corrections

If a calculator looks wrong, unclear, or incomplete, send the page URL and a short explanation through the contact page. Reports that include expected inputs and outputs are the most useful.