An interactive offline-first formula reference built for students, engineers, developers, analysts, and educators.
Designed to answer three questions instantly:
- What is this formula?
- When would I actually use it?
- Why does it matter in real life?
- Instant live search
- Category filtering
- Offline-first single HTML file
- Fast lightweight vanilla JavaScript
- Plain-English explanations
- Responsive modern UI
- Educational examples and intuition
- Covers multiple disciplines
- Algebra
- Geometry
- Trigonometry
- Calculus
- Linear algebra
- Probability
- Distributions
- Hypothesis testing
- Correlation
- Expected value
- Gradient descent
- Activation functions
- Backpropagation
- Loss functions
- Embeddings
- Attention
- Compound interest
- Present value
- Risk metrics
- Discounting
- Portfolio concepts
- Big-O notation
- Graph algorithms
- Dynamic programming
- Hashing
- Bit manipulation
- Collision detection
- Rotation matrices
- Projectile motion
- Delta time
- Interpolation
Most formula sheets are terrible for actual learning.
They show equations without explaining:
- when to use them
- why they matter
- how they connect to real systems
This project was built to bridge the gap between:
- memorization
- intuition
- practical application
The goal is fast understanding, not academic overload.
- Works fully offline
- No frameworks
- No external dependencies
- Fast rendering
- Easily extendable
- Beginner-friendly explanations
- Professional enough for engineers and educators
- HTML5
- CSS3
- Vanilla JavaScript
No frameworks. No build tools. No external libraries.
Simply open:
formulas.htmlin any modern browser.
No installation required.
Teachers, students, tutors, and schools are welcome to use this project for educational purposes.
Please retain attribution.
Contributions are welcome.
You can help by:
- adding formulas
- improving explanations
- fixing inaccuracies
- improving accessibility
- adding new disciplines
Planned ideas:
- formula favorites/bookmarks
- dark/light theme switch
- formula graph visualizations
- quiz mode
- spaced repetition learning
- export cheat sheets
- keyboard navigation
- mobile optimization improvements
CC BY-NC-ND 4.0 License
This project is open-source, but the educational explanations and plain-English translations are my original work. If you use this for teaching, please retain the original author links.
Built by TAHMINA SADIA MAHMUD RODSHI