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Frequently Asked Questions
Fast answers to common questions about our calculation platform.
Are all calculators on this website free?
Yes, all 11 dedicated calculators, converters, and formula guides are completely free and available without registration.
Are entered numbers or data stored on servers?
No. All calculations run strictly client-side inside your browser via JavaScript. No numerical inputs or sensitive figures are ever sent to our servers.
Can these tools be used for business or classroom work?
Yes. Our formulas, explanations, and calculation engines are designed to support students, educators, accountants, and businesses.
How do I report a calculation issue or request a feature?
Use the contact form below or email us directly at contact@calculpourcentage.org, specifying the calculator used and numbers entered.