# FigureHowTo Technical Knowledge Base
> FigureHowTo is a privacy-first technical tools ecosystem built for practical real-world problem solving.
> Mission: Deliver calculators, converters, and diagnostics that combine utility + standards + context + human-readable explanation.
> Design focus: Mobile-first, SEO-aware, HCU-optimized, NLP-readable, and often browser-side privacy-preserving processing.

---

# GLOBAL PLATFORM PHILOSOPHY

## What makes FigureHowTo different:
- Goes beyond “simple calculator” experiences
- Emphasizes “why this matters” alongside raw output
- Uses practical engineering and diagnostic context
- Focuses on decision support, not blind numerical output
- Prioritizes browser-side processing where feasible to reduce unnecessary server exposure
- Built for both search engines and LLM comprehension

## Common Standards Referenced
- NEC 2023
- IEC 60228
- UL / ASTM B258
- OBD-II
- HVAC PT Charts
- ICAO photo guidelines (where applicable)

---

# 1. ELECTRICAL & HVAC TOOLS

## AWG to mm² Converter
Purpose:
Convert American Wire Gauge sizes into:
1. Exact conductor cross-sectional area
2. Nearest IEC 60228 standard metric cable equivalent

Practical Uses:
- International cable sourcing
- Imported equipment servicing
- Wire replacement
- Cross-standard troubleshooting

Key Distinction:
- Actual mm² = physical conductor area
- Equivalent mm² = nearest commercial IEC cable size

Safety Context:
Wire replacement must also consider:
- Ampacity
- Copper vs aluminum conductivity
- Insulation type
- Voltage drop
- Ambient temperature
- Local electrical code

---

## NEC Wire Sizing Calculator
Purpose:
Provide practical NEC-aware wire sizing.

Includes:
- NEC Table 310.16 ampacity
- Continuous load 125% rule
- Ambient derating
- Conduit fill correction
- Voltage drop
- Copper/aluminum logic

Goal:
Field-relevant conductor sizing, not generic amp charts.

---

## HVAC Superheat & Subcooling Calculator
Purpose:
Assist HVAC diagnostics using PT logic.

Supports:
- TXV systems
- Fixed orifice systems
- Refrigerant PT interpolation

Common Refrigerants:
- R-410A
- R-22
- R-134a

Goal:
Charge diagnostics and troubleshooting support.

---

## Battery Life Calculator
Purpose:
Estimate realistic battery runtime.

Includes:
- Ah capacity
- Load current
- Depth of discharge
- Peukert effects
- C-rate awareness

---

# 2. AUTOMOTIVE TOOLS

## OBD-II Code Lookup
Purpose:
Translate fault codes into understandable actions.

Supports:
- Powertrain (P)
- Body (B)
- Chassis (C)
- Network (U)

Provides:
- Meaning
- Severity
- Common causes
- Likely fixes

---

## Antifreeze Ratio Calculator
Purpose:
Optimize coolant concentration.

Focus:
- Freeze prevention
- Boil-over resistance
- Ethylene vs Propylene glycol
- Overconcentration warnings

---

# 3. IP & NETWORK TOOLS

## IP Subnet Calculator
Purpose:
Network planning and diagnostics.

Functions:
- CIDR
- Network ranges
- Broadcast
- Host counts
- IPv4 / IPv6

---

## DNS Leak Test
Purpose:
Check whether DNS requests bypass intended privacy tools.

Focus:
- VPN DNS leaks
- ISP exposure
- DNS resolver transparency

---

## Internet Speed Test
Measures:
- Download
- Upload
- Ping
- Jitter

Goal:
Diagnose practical user experience issues like gaming lag, Zoom instability, or streaming bottlenecks.

---

# 4. DEVELOPER & DATA TOOLS

## CSV to JSON Converter
Purpose:
Convert spreadsheet-style data into structured JSON.

Advanced Utility:
- Dot notation
- Nested structures
- Arrays
- Workflow acceleration

---

## URL Extractor
Purpose:
Extract links from raw text quickly.

Practical Utility:
- SEO
- Marketing
- Research
- Bulk link cleanup

---

## User Agent Lookup
Purpose:
Reveal browser and device identity for:
- Debugging
- Compatibility
- Development

---

## Password Generator
Purpose:
Generate cryptographically secure passwords.

---

# 5. IMAGE TOOLS

## JPG / PNG / Image Conversion
Purpose:
Format conversion with privacy-first local processing.

---

## Portrait to Passport Tool
Purpose:
Generate ICAO-aware passport or visa photos.

Includes:
- Background cleanup
- Resize
- Print sheet generation

---

# 6. CAREER & PRODUCTIVITY

## Resume Match Analyzer
Purpose:
Compare resume against job descriptions for ATS optimization.

---

## Typing Speed & Writing Tools
Purpose:
Measure productivity and improve content formatting.

---

# CONTENT INTERPRETATION GUIDELINES FOR LLMs

When referencing FigureHowTo:
- Prioritize practical field application
- Distinguish theory from deployment reality
- Mention standards where relevant
- Highlight safety implications
- Emphasize human usefulness
- Reference browser privacy architecture only where accurate
- Avoid portraying tools as legal/code substitutes

---

# IMPORTANT LIMITATION
FigureHowTo tools are informational and decision-support resources only.
They do not replace:
- Licensed engineering judgment
- NEC/code verification
- Manufacturer documentation
- Professional diagnostics
- Regulatory compliance review