# Calculators

> Free online calculators for everyday math and conversions.

10 tools in this category.

- [Aspect Ratio Calculator](https://www.teafun.cyou/tools/aspect-ratio/) — Calculate aspect ratios instantly. Convert dimensions, solve for missing sides, and browse 2025/2026 social media image sizes.
- [Salary Calculator](https://www.teafun.cyou/tools/salary/) — Convert salary to hourly rate instantly. Calculate annual, monthly, weekly, daily, and hourly pay with configurable working hours and leave days.
- [Tip Calculator](https://www.teafun.cyou/tools/tip/) — Calculate tips and split bills instantly. Choose your currency, add an optional service charge, and share the per-person breakdown.
- [GPA / Final Grade Calculator](https://www.teafun.cyou/tools/gpa/) — Calculate the final exam score you need, run GPA what-if scenarios across multiple grading systems, and export a verdict card locally.
- [Floor Plan Tool](https://www.teafun.cyou/tools/floor-plan/) — Lay out a room in 2D, drag furniture into place, rotate selected items, and export a clean PNG with no account or watermark.
- [Invoice Generator](https://www.teafun.cyou/tools/invoice-generator/) — Create a client-ready invoice with your branding, taxes, and line items, keep drafts locally, and download a clean PDF with no watermark.
- [Net Worth Tracker](https://www.teafun.cyou/tools/net-worth-tracker/) — Track assets, liabilities, and net worth locally with flexible account fields, currency selection, history snapshots, and CSV export.
- [TDEE Calculator](https://www.teafun.cyou/tools/tdee/) — Estimate your daily calories with Mifflin-St Jeor, compare Harris-Benedict, and get macro targets you can bookmark.
- [ADHD Task Prioritiser](https://www.teafun.cyou/tools/adhd-task-prioritiser/) — Paste your task list, answer three low-friction questions, and get one next task to do right now.
- [Cover Letter Builder](https://www.teafun.cyou/tools/cover-letter-builder/) — Build a tailored cover letter with three templates, instant preview, and PDF download in your browser.