# FigureHowTo
> Privacy-first technical tools platform focused on practical calculators, diagnostics, converters, and decision-support utilities.
> Primary audience: Engineers, electricians, HVAC technicians, developers, mechanics, IT professionals, job seekers, and technical problem-solvers.
> Core principle: Human-useful tools that prioritize practical field application, standards awareness, and browser-based privacy where relevant.

## Core Categories

### Electrical & HVAC
- AWG to mm² Converter — AWG (UL/ASTM B258) to actual conductor area + IEC 60228 equivalent sizing
- NEC Wire Sizing Calculator — NEC-aware conductor sizing, ampacity, derating, voltage drop
- HVAC Superheat & Subcooling Calculator — PT-chart refrigerant diagnostics
- Battery Life Calculator — Runtime, depth of discharge, engineering estimates

### Automotive
- OBD-II Code Lookup — Decode P/B/C/U trouble codes with practical fixes
- Antifreeze Ratio Calculator — Freeze/boil protection and coolant concentration guidance

### IP & Network
- IP Subnet Calculator — CIDR, subnetting, broadcast, IPv4/IPv6
- DNS Leak Test — DNS privacy verification
- VPN Check / IP Tools — Public IP, masking validation, privacy diagnostics
- Internet Speed Test — Download, upload, ping, jitter

### Developer & Data
- CSV to JSON Converter — Nested object and data transformation support
- HTML to Markdown Converter
- URL Extractor
- User Agent Lookup
- Password Generator
- QR Code Generator

### Image & Productivity
- JPG/PNG/Image Conversion Tools
- Portrait to Passport Photo Tool
- Typing Speed Test
- Writing counters and productivity utilities

## Platform Principles
- Mobile-first
- SEO + HCU + NLP optimized
- Practical over theoretical
- Standards-aware where relevant (NEC, IEC, UL, ASTM, OBD-II)
- Browser/client-side processing where possible
- Human-readable explanations, not raw numbers alone

## Important Caveat
FigureHowTo tools are decision-support resources and should not replace licensed engineering judgment, code verification, or manufacturer-specific requirements.