Free Online Tools & Calculators

Handy calculators for astronomy and astrology, math practice, energy planning, network utilities, and email templates — plus a blog on technology and programming.

Astrology & Panchangam

Moon Phase Calculator

Choose a month and year to view the moon phases for each day.

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Sun Rise Sun Set Calculator

Choose a month and year to view sunrise and sunset times for each day.

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Rahu Kaalam Calculator

Choose a month and year to view Rahu Kaalam — a period each day considered inauspicious.

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Tithi Calculator

Choose a month and year to view the Tithi and Paksha for each day — key inputs for selecting a muhurta.

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Nakshatra Calculator

Choose a month and year to view the nakshatra — the lunar zodiac of Vedic astrology — for each day.

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Calculators

Math Problem Generator

Generate addition, subtraction, linear equation, and quadratic equation problems with solutions.

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Energy Usage Calculator

Estimate annual energy use and cost to operate household appliances.

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Age Calculator

Calculate your exact age in years, months, and days from your date of birth.

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Developer Tools

HTML Email Template Generator

Easy-to-use tool to generate HTML email templates.

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JSON Formatter

Format, validate, and beautify JSON data instantly.

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YAML Formatter

Format, validate, and beautify YAML data instantly.

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Regex Helper

Build, test, and learn regular expressions with live match highlighting and a plain-English explainer.

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curl Command Builder

Build, preview, and copy curl commands from a simple request form.

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Markdown Viewer

Write and preview Markdown with live lint feedback, right in your browser.

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HAR Analyzer

Inspect HAR files — requests, timing, and security issues — entirely in your browser.

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Network & Internet

What Is My IP

Find your public IP address, location, and ISP instantly.

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Internet Speed Tester

Test your download, upload, latency, jitter, and packet loss speed instantly.

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Ping Test

Measure round-trip latency to any host with a live trace, right in your browser.

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DNS Lookup

Query A, AAAA, MX, TXT, NS, SOA, CAA, and PTR records against Cloudflare or Google's public resolvers, side by side.

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Timezone Converter

Compare times across multiple cities side by side, search by city name, and share a link to your exact setup.

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WHOIS Lookup

See who a domain is registered to, when it expires, and which name servers it uses.

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Kids & Learning

BrixQuest

Pick a theme, age, and difficulty for a step-by-step LEGO build with a parts list and assembly pictures.

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BotForge

Pick a platform and category for a LEGO MINDSTORMS build with wiring diagram, parts list, and a block-based program.

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Typing Tutor

Practice your typing speed and accuracy with adjustable difficulty, live stats, and mistake tracking.

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Blog

Read the latest technology and computer programming articles.

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