Developer Tools
44 free calculatorsDeveloper utilities should be fast, accurate, and free of friction. These tools handle the encoding, hashing, and conversion tasks that come up constantly in development work - no sign-up, no rate limits.
Every tool shows exactly what it is doing so you can verify the output and understand the transformation applied.
API Rate Limit Calculator
Calculate if your API usage stays within rate limits. Enter requests per second and time window to see if you exceed the allowed threshold.
Bandwidth Calculator
Calculate network bandwidth, data transfer rates, and download times. Enter file size and transfer time to see bandwidth in Mbps, Gbps, or custom units.
Base64 Encoder Decoder
Convert text to Base64 encoding or decode Base64 strings back to readable text. Free online Base64 encoder decoder tool with instant results.
Cache Hit Ratio Calculator
Calculate cache hit ratio percentage from hits and misses. See cache performance efficiency, miss ratio, and optimization recommendations instantly.
CDN Cost Calculator
Calculate CDN costs based on data transfer, bandwidth usage, and provider pricing. Get monthly estimates for CloudFlare, AWS CloudFront, and other CDN services.
Code Complexity Calculator
Calculate cyclomatic complexity of your code. Enter lines of code, conditional statements, and loops to see complexity score and code maintainability rating.
Color Code Converter
Convert colors between hex, RGB, HSL, and HSV formats instantly. Enter any color code and see all equivalent values for web development and design.
Color Contrast Checker
Check color contrast ratios for web accessibility. Enter foreground and background colors to see if they meet WCAG AA/AAA standards for text readability.
Cron Expression Generator
Generate cron expressions for scheduled tasks. Choose frequency, time, and day settings. Get valid cron syntax for Linux, Unix, and task schedulers.
Database Index Size Calculator
Calculate database index storage requirements. Enter table rows, index columns, and data types to see estimated index size in MB and GB for optimal database ...
Deploy Frequency Calculator
Calculate deployment frequency to measure DevOps performance. Enter deploys per day, week, or month - see annual rate and DORA metric benchmark level.
Docker Resource Calculator
Calculate Docker container memory and CPU requirements. Enter container count, memory per container, and CPU cores to see total resource needs.
Equal Sign Symbol Generator
Generate equal signs (=) and mathematical equality symbols. Copy standard equals, double equals, triple equals, and other equality operators for math, coding...
Error Budget Calculator
Calculate how much downtime your service can have without breaking SLAs. Enter uptime target and time period — see error budget in minutes, hours, and percen...
Git Commit Frequency Calculator
Calculate your Git commit frequency and development velocity. Enter total commits and time period to see commits per day, week, and month for development tra...
Hash Generator
Generate secure MD5, SHA-1, SHA-256, and SHA-512 hashes from any text input. Instant cryptographic hash generation for passwords, data integrity, and securit...
HTML Entity Encoder
Encode special characters to HTML entities. Enter text with symbols like <, >, &, quotes. Get safe HTML entity codes instantly for web development.
HTTP Status Code Lookup
Enter any HTTP status code to see its meaning, description, and when it's used. Decode 404, 500, 200 and all HTTP response codes instantly.
HTTP Status Code Reference
Look up any HTTP status code instantly. Enter a code like 404 or 500 to see its meaning, description, and when it occurs.
IP Subnet Calculator
Calculate network address, broadcast address, and host range from any IP address and subnet mask. Supports CIDR notation and subnet mask formats.
JSON Formatter
Format, validate, and prettify JSON data instantly. Clean up minified JSON, fix syntax errors, and make your data readable with proper indentation.
JSON to CSV Converter
Convert JSON data to CSV format instantly. Paste your JSON array or object and get downloadable CSV output with proper headers and formatting.
JWT Decoder
Decode JWT tokens instantly to view headers, payloads, and verify signatures. Parse JSON Web Tokens safely without sending data to external servers.
Kubernetes Pod Calculator
Calculate how many Kubernetes pods fit on your nodes. Enter CPU cores, memory per node, and pod resource requirements to see maximum pod capacity.
Latency Calculator
Calculate network latency from distance and transmission speed. See round-trip time, one-way delay, and bandwidth impact for any connection.
Markdown to HTML Converter
Convert Markdown text to clean HTML code instantly. Paste your Markdown content and get properly formatted HTML output with headings, links, and lists.
Mean Time To Recovery Calculator
Calculate MTTR to measure how fast your team fixes system outages. Enter total downtime and number of incidents to see average recovery time.
Microservice Latency Calculator
Calculate total latency across microservice chains. Enter service latencies and network delays to see end-to-end response time and identify bottlenecks.
Password Strength Checker
Check password strength instantly with our secure password analyzer. Test complexity, entropy, and security score online.
Random Password Generator
Generate secure random passwords with customizable length and character sets. Include uppercase, lowercase, numbers, and symbols for maximum security.
Regex Complexity Calculator
Calculate regex complexity and performance metrics. Enter your regular expression pattern and see time complexity, backtracking risk, and optimization sugges...
Regex Tester
Test regular expressions against text instantly. Debug regex patterns, validate matches, and see capture groups with live feedback for faster development.
Server Capacity Calculator
Calculate server capacity requirements for your application. Enter expected users, requests per user, and response times to see CPU cores, RAM, and concurren...
SHA256 Hash Generator
Generate secure SHA256 hashes instantly. Free online SHA256 hash generator for text encryption, password security, and data integrity verification.
Slug Generator
Generate SEO-friendly URL slugs from any text. Convert titles, headlines, and phrases into clean, web-optimized slugs instantly.
SSL Certificate Expiry Calculator
Check when your SSL certificate expires and how many days until expiry. Enter your domain name to see expiration date, days remaining, and renewal timeline f...
Technical Debt Calculator
Calculate how much technical debt costs your team. Enter development hours, hourly rate, and complexity multiplier to see monthly debt cost and payoff time.
Test Coverage Calculator
Calculate test coverage percentage for your codebase. Enter total lines of code and tested lines to see coverage percentage and quality assessment.
Text Encryption Tool
Encrypt and decrypt text using AES-256 encryption. Enter your message and password to secure data or decrypt encrypted text safely.
Unix File Permission Calculator
Convert Unix file permissions between octal notation (755, 644) and symbolic notation (rwxr-xr-x). See what each permission number means instantly.
Unix Timestamp Converter
Convert Unix timestamps to human-readable dates and vice versa. Free online Unix epoch time converter with timezone support.
Uptime SLA Calculator
Calculate allowed downtime for any SLA percentage. Enter uptime percentage and time period — see exact downtime allowance in days, hours, and minutes.
URL Encoder Decoder
Encode and decode URLs instantly. Convert special characters to percent-encoded format or decode URL-encoded strings back to readable text.
UUID Generator
Generate unique UUID identifiers instantly. Create v4 UUIDs for databases, APIs, and applications. Free online UUID generator tool.