BlackCloudTools

BMI Calculator

Calculate your BMI (Body Mass Index) with our free online tool. Includes WHO categories, health recommendations, and metric/imperial support.

Percentage Calculator

Calculate percentages in 4 modes: X% of Y, X is what % of Y, percentage change, and percentage difference.

Compound Interest Calculator

Calculate compound interest with all compounding frequencies. Includes contributions, APY, and year-by-year growth table.

Simple Interest Calculator

Calculate simple interest on loans and investments. Shows total amount, daily, and monthly interest breakdown.

Temperature Converter

Convert temperature between Celsius, Fahrenheit, Kelvin, and Rankine. Instant, accurate temperature unit converter.

Weight Converter

Convert weight between kilograms, pounds, ounces, grams, milligrams, metric tons, and stone. NIST-exact conversion factors.

Age Calculator

Calculate exact age between two dates. Shows years, months, days, total weeks, hours, and next birthday countdown.

Tip Calculator

Calculate tip amount and split the bill among multiple people. Supports custom tip percentages and any number of guests.

Discount Calculator

Calculate sale price after discount. Find discount amount, final price, and savings instantly. Supports any percentage.

Character Counter

Count characters, words, lines, spaces, and paragraphs in real time. Includes social media character limits for Twitter, Instagram, and LinkedIn.

QR Code Generator

Generate free QR codes for URLs, plain text, WiFi networks, and contact cards (vCard). Download as PNG, no sign-up, no expiry.

Image Compressor

Compress JPG, PNG, and WebP images to a target file size in KB or MB, free and instantly in your browser. No upload required.

Favicon Generator

Generate a multi-size favicon.ico file from any image or logo, free and instantly in your browser. Includes 16, 32, 48, 64, 128, and 256px sizes.

PDF Merge

Merge multiple PDF files into a single document, free and instantly in your browser. Reorder files before merging. No upload required.

PDF Compressor

Reduce PDF file size for free, right in your browser. Best for scanned or image-heavy PDFs. No upload, no sign-up.