Engineering Tools

Free, no-signup engineering calculators that run in your browser. No data is sent to a server — every calculation happens on your device.

• Kubernetes Kubernetes Resource Budget Calculator Estimate how many nodes you need, your packing efficiency, and the projected monthly cost from pod requests and node size.
• Networking CIDR / Subnet Calculator Compute the network address, broadcast, subnet mask, usable host range and address type from CIDR notation.
• DevOps Cron Expression Parser Parse a cron expression field by field and see the next run times. For Kubernetes CronJobs and scheduled tasks.
• Time Epoch / Unix Timestamp Converter Convert Unix epoch timestamps to readable dates and back. Seconds and milliseconds are auto-detected.
• Generator UUID Generator Generate cryptographically secure UUID v4 and time-ordered v7. Bulk generation and format options.
• Security Hash Generator (SHA) Compute SHA-1, SHA-256, SHA-384 and SHA-512 digests of text instantly. Via the Web Crypto API, in the browser.
• Security JWT Decoder Decode the header and payload of a JSON Web Token, inspect the standard claims and expiry. The token never leaves your browser.
• Security HTML / Entity Encoder-Decoder Encode text to HTML entities or decode it back. Escape special characters to prevent XSS; in the browser, no signup.
• Encoding Base64 Encoder-Decoder Encode text to Base64 or decode it back. Standard and URL-safe (base64url) variants; UTF-8 aware, in the browser.
• Web HTML Viewer Paste HTML source and preview it live instantly. In a sandboxed, isolated frame; scripts are disabled for safety.