Formula Sheet Builder — Organise Equations by Subject
Build a personal formula reference sheet for any subject. Add formulas with names and notes, filter by subject, search instantly, and export as a text file. Saved in your browser — no account needed.
Add a formula
No formulas yet. Add your first formula above.
How the Formula Sheet Builder Works
- 1Enter a formula name, select a subject, and type the formula (e.g. F = ma).
- 2Add optional notes to explain variables or conditions (e.g. "where F = force in Newtons").
- 3Use the subject filter or search bar to quickly find any formula.
- 4Click Copy to paste a formula into another app, or Export to download the full sheet as a text file.
Why a Personal Formula Sheet Works Better
Copying formulas from a textbook into your own sheet is itself a form of active recall. The act of deciding how to name and annotate each formula forces you to understand it. A curated personal sheet also loads faster to review than scanning a textbook index — especially useful before an exam when time is limited.
Tips for Building a Great Formula Sheet
Include units in the notes
Write what each variable represents and its SI unit. For example: "V = voltage (V), I = current (A), R = resistance (Ω)". This prevents unit errors in calculations.
Add condition notes
Many formulas only apply under specific conditions. Note them: "valid for uniform circular motion", "assumes incompressible fluid", "at standard temperature and pressure".
Group related formulas
Use consistent subject tags so related formulas cluster together. Consider making a separate "Derivations" entry that shows how one formula leads to another.
Export before an exam
Download your sheet as a text file and print it for open-note exams, or paste it into a read-only doc you can access offline during an online exam.
Frequently Asked Questions
Are my formulas saved automatically?
Yes. Formulas are saved to your browser's localStorage and persist between sessions on the same device and browser.
Can I export my formula sheet?
Yes. Click the Export button to download all formulas as a plain text file (.txt) that you can print, share, or import into a notes app.
How do I enter special symbols like Greek letters?
Type them directly if your keyboard supports it, or copy from a character map. Common symbols: Δ, Σ, π, μ, ω, θ, λ, α, β, γ. You can also write them phonetically (e.g. "omega" or "lambda") for searchability.
Can I organise formulas by subject?
Yes. Each formula has a subject field (Math, Physics, Chemistry, etc.). Use the subject filter tabs above the list to view formulas for a specific subject only.
Is there a limit on the number of formulas?
No hard limit. localStorage typically allows several MB, enough for hundreds of formulas.
Can I share my formula sheet with classmates?
Currently the sheet is stored locally in your browser. Use the Export button to download a text file and share it, or paste the content into a shared document.