Free online utilities for software engineers, web developers, and sysadmins: calculate IPv4 CIDR subnet ranges, estimate file bandwidth download times, convert color spaces, format JSON, test regular expressions, and forecast LLM API costs.
Calculate exact file download and upload transfer times across any internet bandwidth and file size.
Calculate network address, broadcast address, CIDR range, and usable host count for IPv4 subnets.
Convert colors instantly between HEX, RGB, HSL, and CMYK formats with real-time visual preview.
Convert Unix epoch timestamps to human-readable UTC and local date formats, and convert dates to epoch.
Format, validate, beautify, and minify JSON data with instant syntax error detection and tree stats.
Generate cryptographic hash digests in SHA-256, SHA-1, and MD5 for text verification and checksums.
Generate random, cryptographically secure passwords with custom character sets, entropy, and length.
Encode strings to RFC 4648 Base64 or decode Base64 data to plain text instantly in your browser.
Percent-encode special characters in URLs or decode URL-encoded query strings into plain text.
Test and debug regular expressions in real time with syntax highlighting and match extraction.
Calculate API usage costs for LLMs, microservices, and webhooks based on request volume and token rates.
Count characters, words, sentences, paragraphs, and reading time in real time as you type.
Select the calculator matching your exact financial question, input your baseline numbers, and compare multiple realistic scenarios. Our calculation models run client-side mathematical algorithms verified against banking benchmarks and statutory formulas.
Start with the calculator that directly models your primary objective (e.g. calculate monthly EMI before applying for loans, or model SIP returns before selecting mutual funds), then use related secondary tools to compare scenarios and validate your plan.
Yes, our calculators are continuously updated to reflect 2026 financial benchmarks, statutory RBI guidelines, Union Budget standard deductions (₹75,000), revised tax slabs, and banking amortization standards.
100% free with no registration required. All calculations execute client-side in your web browser—your personal financial figures and salary data are never transmitted or stored on any remote server.
