# IGCSE Grade Calculator

> Technical reference for IGCSE grade calculations, weighted component logic, and CAIE grade thresholds (2025-2026).

## Core Information
- Purpose: Automated conversion of raw IGCSE marks to final weighted grades.
- Data Baseline: November 2025 Official Thresholds & 2026 Projections.
- Supported Subjects: 70+ CAIE syllabuses (Science, Math, Humanities, etc.).

## Main Resources
- [Calculator Tool](https://igcsegradecalc.site/): Interactive tool for calculating total weighted marks and grades.
- [Update History](https://igcsegradecalc.site/update.html): Changelog of threshold data and feature releases.
- [Blog Archive](https://igcsegradecalc.site/blog_list.html): Educational content on exam strategies.

## Technical Documentation
- [Grading Logic Explained](https://igcsegradecalc.site/blog-grading-explained.html): Details on the mathematical relationship between raw marks and weighting factors.
- [Revision Strategy](https://igcsegradecalc.site/blog-past-year-strategy.html): Analysis of marking schemes and component-based preparation.

## Data Structure Note
The calculator logic follows the formula: 
Total Weighted Mark = Σ (Component Raw Mark × Weighting Factor). 
Final Grade = Lookup(Total Weighted Mark, Threshold_Table[Subject][Option]).