DNA Triangulation Calculator

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  visual of triangulated matches on chromosomes

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  Summaries

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  Filtering

🧬 DNA Triangulation Calculator

Inspiration

As a genealogist navigating multiple DNA testing platforms, I constantly faced the challenge of manually comparing chromosome segment data to confirm ancestral links. Most tools either required deep technical expertise or didn’t allow cross-platform triangulation. I wanted a solution that made complex DNA segment triangulation accessible, accurate, and intuitive — and one that respected user privacy.

What it does

DNA Triangulation Calculator processes chromosome segment data from multiple DNA testing platforms, detects triangulated matches, and suggests likely shared ancestors — even integrating GEDCOM family tree files. It supports:

🧬 Overlap-based triangulation detection 📏 Relationship estimation via shared cM ✅ Confidence scoring 🌳 GEDCOM family tree matching 🧠 Smart name deduplication and data fusion 📊 Visual filters and export tools All processing happens in-memory — nothing is stored or sent to a backend.

How I built it

BOLT!! React + TypeScript for frontend logic and safety Vite for lightning-fast development Tailwind CSS for rapid styling Custom CSV Parser with intelligent header detection GEDCOM parser to build ancestry graphs in-memory Triangulation algorithm that groups overlapping segments and scores MRCA candidates based on cM, surname convergence, haplogroup consistency, and more No backend — everything runs client-side

Challenges I ran into

Unifying different CSV formats across DNA vendors Deduplicating messy name data while preserving useful metadata Designing an algorithm that scored both genetic overlap and genealogical fit (lifespan, location, surname) Integrating GEDCOM data meaningfully without overwhelming the interface Keeping everything private and performant — especially with large files

Accomplishments that I'm proud of

✅ Built a working triangulation engine from scratch — no libraries used ✅ Real-time GEDCOM integration that works offline ✅ Automatically deduplicates names across files and merges metadata ✅ Visual chromosome browsing + annotation system ✅ Fully client-side and privacy-focused

What I learned

How varied DNA segment data formats really are That combining genealogical logic with genetic evidence requires more than math — it requires inference, context, and fuzziness-- that means coding for that fuzziness GEDCOM files are incredibly rich, but hard to parse without structure Genealogical triangulation benefits from scoring systems that weigh evidence (not just detect overlaps)

What's next for DNA Triangulation Calculator

🔍 Add interactive chromosome browser with zoom and segment coloring 🤖 Integrate GPT-powered ancestral suggestion tool based on surnames, locations, and timeframes 🧠 Machine learning scoring model trained on known genealogical outcomes 🔗 Live App: https://dnatriangulationcalculator.netlify.app 🔗 Source Code: https://github.com/ginn444/DNA-Triangulation-Calculator

Built With

• html
• typescript