# Sys-Metrics (www.sys-metrics.com)
> High-precision system metrics, network infrastructure calculators, and developer utilities.

## Creator & Lead Developer
- **Name:** Mujtaba
- **Developer Portfolio:** [https://mujtaba.sys-metrics.com](https://mujtaba.sys-metrics.com)
- **Technical Contact:** contact@sys-metrics.com

## Core Calculators & Tools

- [IPv4 CIDR & Subnet Calculator](https://www.sys-metrics.com/subnet-calculator): Calculates network addresses, broadcast addresses, usable IP host ranges, total/usable host counts, dotted-decimal and binary subnet masks, wildcard masks, and RFC 1918 private/public IP classifications.
- [Data Transfer Time & Bandwidth Calculator](https://www.sys-metrics.com/bandwidth-calculator): Calculates exact download and upload transfer durations across network speeds (Kbps, Mbps, Gbps) with customizable TCP/IP protocol overhead allowances and common backup/game presets.
- [RAID Storage & Redundancy Calculator](https://www.sys-metrics.com/raid-calculator): Evaluates usable storage volume, parity/protection capacity, drive fault tolerance, and read/write speed multipliers for RAID 0, 1, 5, 6, 10, 50, and 60 with visual topology arrays.
- [Storage Units Converter](https://www.sys-metrics.com/storage-converter): Converts Decimal SI units (KB, MB, GB, TB) to Binary IEC units (KiB, MiB, GiB, TiB) and calculates why operating systems report fewer gigabytes on formatted drives.
- [Server Power & Electricity Cost Estimator](https://www.sys-metrics.com/server-power-calculator): Estimates daily, monthly, and annual kilowatt-hour (kWh) consumption and electricity costs for servers and homelabs based on wattage, utility rates, and PUE.
- [Linux Chmod Permissions Calculator](https://www.sys-metrics.com/chmod-calculator): Interactive visual file permissions builder converting between octal (755, 644) and symbolic (rwxr-xr-x) notation with command generators for chown, chmod, and recursive directories.
- [Cryptographic Hash & Base64 Encoder](https://www.sys-metrics.com/base64-hash-tools): Client-side Base64, URL encoding/decoding, and real-time SHA-256, SHA-512, and MD5 cryptographic checksum generation.
- [Password & Secret Entropy Calculator](https://www.sys-metrics.com/password-entropy-calculator): Evaluates bit entropy, character pool complexity, and brute-force cracking time metrics across hypothetical GPU clusters.
- [Cron Schedule Expression Builder](https://www.sys-metrics.com/cron-generator): Translates 5-field crontab expressions into plain English with upcoming execution schedules.
- [Unix Epoch Timestamp Converter](https://www.sys-metrics.com/epoch-converter): Live ticking epoch clock with bidirectional conversions between seconds, calendar dates, and ISO 8601 strings.
- [Live DNS & MX Record Lookup](https://www.sys-metrics.com/dns-lookup): Queries authoritative DNS records (A, AAAA, MX, TXT, CNAME, NS, SOA) globally in real time via secure DNS-over-HTTPS (DoH).
- [JWT Token Decoder & Inspector](https://www.sys-metrics.com/jwt-decoder): Decodes RFC 7519 JSON Web Tokens client-side, inspecting headers, claims, expiration dates (exp), and algorithm details without logging or transmission.
- [Bulk UUID / GUID Generator](https://www.sys-metrics.com/uuid-generator): Generates cryptographically secure Version 4 (v4) and Version 7 (v7) UUIDs in bulk with customizable hyphens, uppercase casing, and curly braces.
- [Natural Language Translator & Humanizer](https://www.sys-metrics.com/human-translator): Converts stiff, robotic, textbook, or AI-generated writing into authentic, everyday spoken human phrasing with multi-language colloquial translation and text-to-speech audio.
- [Client-Side JSON Formatter & Validator](https://www.sys-metrics.com/json-tools): Beautifies, minifies, and inspects JSON payloads 100% client-side with zero data transmitted across the wire.
- [Net Salary & Paycheck Calculator](https://www.sys-metrics.com/salary-calculator): Calculates gross to take-home pay, progressive tax brackets, social security and pension deductions, and hourly wage equivalents.
- [End of Service Gratuity Calculator](https://www.sys-metrics.com/gratuity-calculator): Computes statutory end-of-service severance pay (EOSB) based on labor law standards for limited and unlimited employment contracts.
- [Invoice Generator & VAT Tax Calculator](https://www.sys-metrics.com/invoice-generator): Generates professional itemized invoices with dynamic VAT/sales tax rates, discounts, subtotal calculations, and clean printable PDF export.
- [Uptime SLA & Downtime Calculator](https://www.sys-metrics.com/uptime-sla-calculator): Converts service availability percentages (99%, 99.9%, 99.99% nines) into exact daily, monthly, and annual allowed downtime budgets with SRE error budget tracking.
- [cURL to Code Converter](https://www.sys-metrics.com/curl-converter): Converts browser DevTools cURL commands into clean, idiomatic Python (requests & httpx), JavaScript (fetch & axios), Go, and PHP scripts.
- [YAML to JSON & JSON to YAML Converter](https://www.sys-metrics.com/yaml-json-converter): Two-way client-side converter, validator, and formatter for Kubernetes manifests, Docker Compose configs, CI/CD pipelines, and JSON structures.
- [Custom QR Code Generator & Designer](https://www.sys-metrics.com/qr-code-generator): Generates high-resolution custom QR codes client-side for URLs, Wi-Fi credentials, vCard contacts, emails, and phone numbers with PNG and SVG vector export.

- [LLM API Pricing & Token Cost Calculator](https://www.sys-metrics.com/llm-pricing-calculator): Estimates and compares daily, monthly, and annual API costs across OpenAI (GPT-4o, o1, o3-mini), Anthropic Claude (3.5 Sonnet, Haiku, Opus), Google Gemini (1.5/2.0 Flash, Pro), and DeepSeek (V3, R1) with prompt caching and batch discount modeling.
- [Cloud Egress & Data Transfer Cost Estimator](https://www.sys-metrics.com/cloud-egress-calculator): Models data transfer out (DTO) bandwidth charges across AWS, Google Cloud Platform (GCP), and Microsoft Azure, contrasting tiered cloud egress against zero-egress providers like Cloudflare R2 and Hetzner.
- [1099 vs W-2 Tax & Contractor Rate Calculator](https://www.sys-metrics.com/contractor-rate-calculator): Converts between full-time employee W-2 compensation and independent 1099 contractor hourly rates, factoring in the 15.3% Self-Employment Tax (FICA), uncompensated PTO/holidays, health insurance, and billable utilization.
- [Interactive Regex Tester & Pattern Debugger](https://www.sys-metrics.com/regex-tester): Client-side ECMAScript regular expression tester with live color-coded match highlighting, capture group extraction, error diagnostics, and presets for IPv4, Email, UUID, SemVer, and ISO 8601 timestamps.
- [Database IOPS & Storage Throughput Calculator](https://www.sys-metrics.com/iops-calculator): Computes continuous storage throughput (MB/s) and raw backend disk IOPS needed for databases, factoring in IO block sizes (4KB, 8KB, 16KB, 64KB), read/write ratios, and RAID write penalties (RAID 10, RAID 5, RAID 6) for AWS EBS gp3 and SSD volumes.
- [Content Security Policy (CSP) & Security Headers Generator](https://www.sys-metrics.com/security-headers-generator): Generates production-hardened Content-Security-Policy (CSP), HSTS, X-Frame-Options, X-Content-Type-Options, and Referrer-Policy headers for Nginx, Apache, and Cloudflare.

- [IPv6 CIDR Subnet Calculator & Address Expander](https://www.sys-metrics.com/ipv6-subnet-calculator): Calculates IPv6 network boundaries, address allocations, compresses/expands 128-bit addresses per RFC 5952, and models standard /64 and /48 routing topologies.
- [MAC Address & Hardware OUI Lookup](https://www.sys-metrics.com/mac-lookup): Identifies network hardware vendors (Cisco, Apple, Dell, Intel, VMware) from Layer 2 MAC addresses, parses IEEE 24-bit OUI blocks, and converts between colon, hyphen, and Cisco dotted notations.
- [Network Port Reference & Protocol Directory](https://www.sys-metrics.com/port-reference): Comprehensive directory of standard IANA TCP/UDP port numbers, protocols, and security recommendations for firewall rules and systems monitoring.
- [Syslog Message Generator & RFC 5424 Parser](https://www.sys-metrics.com/syslog-generator): Constructs and parses RFC 5424 / RFC 3164 Syslog messages with real-time PRI priority calculation across 24 facilities and 8 severity levels for SIEM testing.

## Technical Contact
- Email: contact@sys-metrics.com
- Domain: https://www.sys-metrics.com
- Portfolio: https://mujtaba.sys-metrics.com