Software & Web calculators
Choose a task below. Check each calculator’s assumptions and units before using its result.
CIDR Subnet & Netmask Calculator
Calculate usable host range, broadcast address, and netmask for any IPv4 prefix.
Free Aspect Ratio Calculator & Dimension Scaler
Scale dimensions proportionally and generate responsive CSS padding percentages.
Free Conventional Commit Message Generator
Format standard semantic Git commit messages with types, scopes, and breaking changes.
Free LLM Context Window Token Budget Calculator
Allocate context window tokens across system prompts, RAG retrieval, and replies.
Free LLM Token Pricing & API Cost Calculator
Compare token and inference costs across GPT-4o, Claude 3.5, and Gemini models.
Free Password Entropy & Crack Time Calculator
Measure password strength with Shannon entropy bits and GPU brute-force crack time.
Free Unicode Bold & Italic Text Generator
Convert plain text to bold, italic, and script Unicode fonts for social media.
Free WCAG Color Contrast Ratio Checker
Test foreground and background color combinations against WCAG 2.1 AA & AAA ratios.
Online SVG Minifier & Path Cleaner - Reduce SVG File Size
Compress SVG graphics, remove unnecessary metadata, and round decimal precision.
Visual Cron Expression Generator & Schedule Builder
Build and decode 5-part cron schedules visually with human-readable explanations.