More free tools
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Instantly calculate the square footage of any room, floor, wall, or space. Perfect for home renovation, flooring, painting, and building projects.

Calculate percentages instantly — find what percent one number is of another, calculate percentage increase or decrease, and more.

Calculate your exact age in years, months, and days from your date of birth. Also find the difference between any two dates.

Add up work hours and minutes between times, build weekly timesheets, and compute overtime pay across 50+ time zones.

Convert between profit margin and markup, find break-even, and factor in platform fees, shipping, and tax.

Work out billable shipping weight for FedEx, UPS, USPS, DHL and more carriers, comparing actual vs volumetric weight.

Calculate the volume of a box from its length, width, and height in any units — for shipping, storage, and packing.

Parcel length-plus-girth against carrier size limits, plus body circumference measurements for fitness tracking.

Engineering and scientific unit converter with printable reference tables — wire gauges, drill bits, pipe sizes, and more.

Free, unbiased solar and off-grid calculators — system sizing, savings and payback, and battery banks.

Calculate EMIs for home, car, and personal loans in India. See total interest, principal breakdown, and a full amortization schedule.

Calculate voltage drop across wire runs by gauge, length, and current. Check against NEC limits for safe electrical installations.

Estimate daily calorie needs, TDEE, and macros from your age, weight, height, and activity level for weight loss or gain.

See the total interest you'll pay over the life of any loan, with monthly payments and a complete amortization breakdown.

Size an air conditioner for any room by square footage, climate, and sun exposure to find the right cooling capacity in tons.

Calculate the volume and fill level of cylindrical, rectangular, and oval tanks in gallons, liters, and more.

Work out cubic yards of concrete, gravel, mulch, or soil for landscaping and construction projects.

Calculate your Body Mass Index and Basal Metabolic Rate, plus daily calorie needs based on your activity level.

Size an off-grid battery bank from your daily energy use, days of autonomy, and depth of discharge.

Add, subtract, multiply, and divide fractions with clear step-by-step working and simplified results.

Size a generator or UPS by adding up appliance wattage and runtime for home and office backup power.

Calculate stair rise, run, stringer length, and number of steps to build code-compliant staircases.

Estimate concrete, cement, sand, and aggregate quantities for slabs, footings, columns, and walls.

Project the future value of your mutual fund SIP investments with expected returns and step-up options.

Estimate shingles, underlayment, and materials needed for any roof by area, pitch, and waste factor.

Calculate your GPA and CGPA from course grades and credit hours, with weighted and unweighted options.

A suite of construction math tools — feet-and-inches, area, volume, and material estimates for job sites.

Calculate the water volume of rectangular, round, and oval pools in gallons and liters for dosing and heating.

Decode any Base64-encoded string back to plain text instantly. Supports standard Base64, URL-safe Base64, and file decoding — all in your browser.

Encode any text, file, or data into Base64 format. Used by developers for encoding data in APIs, emails, HTML, and configuration files.

Encode special characters in URLs to make them safe for web use, or decode URL-encoded strings back to readable text. Essential for web developers.

Format, validate, minify, and convert JSON in your browser. Pretty-print messy JSON, spot syntax errors with line numbers, and switch between JSON, YAML, CSV, and XML.

Generate MD5, SHA-1, SHA-256, SHA-512 and other cryptographic hashes from any text or file. Useful for integrity checks, password hashing demos, and developer testing.

Generate UUID v1, v4, and v7 identifiers in bulk for use in databases, APIs, distributed systems, and testing. Copy single UUIDs or batches with one click.

Count words, characters, sentences, paragraphs, and reading time as you type. Useful for essays, blog posts, social media captions, and SEO content.

Convert between Unix epoch timestamps and human-readable dates. Supports seconds, milliseconds, and time zones.

Build and decode cron expressions with plain-English explanations and the next run times for any schedule.

Build, test, and debug regular expressions with token-by-token explanations, a pattern library, and code in 7 languages.

Calculate, split, and visualize subnets. IPv4/IPv6, VLSM planner, cloud-aware reserved IPs, and Terraform export.

Network and broadcast addresses, usable host range, wildcard masks, and VLSM planning for IPv4 and IPv6.

Repeat any word, phrase, or emoji up to 100,000 times with custom separators and optional numbering.

Convert text between Title Case, sentence case, camelCase, snake_case, kebab-case, and more, with side-by-side preview.

Browser-based image tools — compress, convert, resize, crop, and watermark. Files never leave your device.

Strip EXIF, GPS, and hidden metadata from images, PDFs, and Office files — locally in your browser.

Online alarm clock, timer, stopwatch, and world clock that runs in your browser. Alarms ring even in a background tab.

Merge, split, compress, convert, and edit PDF files right in your browser — nothing is uploaded to a server.

Convert colors between HEX, RGB, HSL, and more, build palettes, and check contrast for accessible design.

Create QR codes and barcodes for URLs, text, Wi-Fi, and products, then download them as PNG or SVG.

Convert cooking measurements between cups, grams, ounces, and milliliters for accurate recipes.

Convert numbers into written words and currency amounts for checks, invoices, and legal documents.

Test your download, upload, and ping speeds right in the browser with an accurate, ad-light speed test.

Instantly see your public IP address, location, ISP, and browser details — IPv4 and IPv6 supported.

Look up domain registration, ownership, expiry dates, and DNS records with a fast WHOIS lookup tool.