Simple tools with clear answers
PenniTools is designed for quick calculations on phones and computers. Each calculator explains the result and, where useful, shows the formula so you can check the answer yourself.
PenniTools helps you calculate money, vehicle, construction, document and everyday measurements in seconds. No account is required for the basic tools.
PenniTools is designed for quick calculations on phones and computers. Each calculator explains the result and, where useful, shows the formula so you can check the answer yourself.
Calculate square feet from inches, feet, centimetres or millimetres. For example, 77 × 33 inches is 2,541 square inches, which is 17.646 square feet.
Use practical calculators for loans, salary, savings, taxes and other everyday financial estimates. Results are estimates and should be checked against your lender or official documents.
Where a tool is designed to process a file in your browser, your selected file is not intentionally uploaded by PenniTools. Check each tool's instructions before using sensitive documents.
PenniTools is an independent collection of free calculators and practical online tools created to make everyday tasks easier. Our goal is to provide simple interfaces, transparent formulas and useful results without unnecessary complexity.
For feedback, broken tools, suggestions or partnership enquiries, please contact the PenniTools site owner using the contact method published on the website. Please do not send passwords, bank credentials or other sensitive information.
PenniTools is designed to minimize unnecessary collection of personal information. Some tools may process files locally in your browser. Third-party services, analytics, advertising and embedded services may process information according to their own policies when they are enabled.
We do not ask users to enter passwords, banking credentials or payment card details into calculators. Do not submit sensitive personal information unless a future feature explicitly requires it and explains why.
PenniTools provides calculators and tools for general informational and practical purposes. Results are estimates and are not professional financial, legal, medical, engineering or construction advice. You are responsible for checking important results before relying on them.
Calculator outputs can contain rounding or input-related errors. For regulated, financial, health, construction or other high-stakes decisions, verify the result with an appropriate professional or official source.
PenniTools may eventually use affiliate links. If you purchase something through an eligible affiliate link, PenniTools may receive a commission at no additional cost to you. Affiliate recommendations will be relevant to the tool or topic being viewed.