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Finance Calculators
20 tools
Mortgage Calculator
Monthly payment & amortization schedule
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EMI Calculator
Calculate monthly loan installments
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Loan Calculator
Total cost and monthly payments
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Personal Loan Calculator
Personal loan repayment breakdown
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Auto Loan Calculator
Car financing and monthly cost
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Health & Fitness
15 tools
BMI Calculator
Body mass index with weight category
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BMR Calculator
Calories burned at complete rest
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TDEE Calculator
Total daily calorie needs
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Calorie Calculator
Daily calories for your goal
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Protein Calculator
Daily protein intake for your goal
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Text Tools
15 tools
Word Counter
Count words, characters, sentences
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Character Counter
Characters with and without spaces
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Sentence Counter
Count sentences in any text
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Paragraph Counter
Count paragraphs in your text
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Case Converter
UPPER, lower, Title, camelCase
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Developer Tools
10 tools
JSON Formatter
Format, validate & minify JSON — with tree view
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Base64 Encoder / Decoder
Encode text & files to Base64, decode back
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URL Encoder / Decoder
Encode/decode URLs + query string parser & builder
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JWT Decoder
Decode JWT tokens — header, payload & expiry
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UUID Generator
Generate UUID v4/v1, bulk mode & validator
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Utilities
10 tools
Password Generator
Strong passwords — random, passphrase, PIN + entropy score
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QR Code Generator
URL, WiFi, vCard, Email, SMS — custom colors + download
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Random Number Generator
Numbers, dice, list shuffler, lotto — crypto-secure
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Coin Flip & Dice Roller
Animated flips, multi-dice, d4–d100, statistics tracking
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Countdown Timer & Stopwatch
Countdown, stopwatch with laps, Pomodoro, multi-timer
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Unit Converters
10 tools
Length Converter
Meters, feet, miles, km, inches, light-years
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Weight Converter
kg, lbs, grams, ounces, stones, troy units
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Temperature Converter
°C, °F, Kelvin, Rankine, Delisle & more
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Area Converter
m², ft², acres, hectares, square miles
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Volume Converter
Liters, gallons, cups, ml, fl oz, pints
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Image Tools
10 tools
Image Compressor
Reduce image size without quality loss
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Image Resizer
Resize to any dimension instantly
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Image Cropper
Crop images to exact size
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JPG to PNG
Convert JPG images to PNG format
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PNG to JPG
Convert PNG images to JPG format
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PDF Tools
5 tools
SEO Tools
10 tools
Meta Tag Generator
Title, description, robots & canonical tags
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OG Tag Generator
Open Graph & Twitter Card with live preview
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Slug Generator
Convert any text to SEO-friendly URL slug
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Reading Level Checker
Flesch-Kincaid, Gunning Fog, SMOG grade
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Keyword Density Analyzer
1/2/3-gram frequency & density percentage
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Everyday Utilities
10 tools
Password Generator
Strong random passwords instantly
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QR Code Generator
Create QR codes for any URL or text
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Barcode Generator
Generate scannable barcodes online
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Random Number Generator
Random numbers in any range
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Coin Flip
Heads or tails — flip a coin online
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New Tools
10 tools
Ovulation Calculator
Fertile window & peak ovulation day
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Password Strength Checker
Entropy, crack time & security score
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IP Address Lookup
Find location, ISP & network info
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Word Frequency Counter
Word cloud, frequency table & CSV export
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JSON to CSV
Convert JSON arrays to CSV with preview
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Why Choose Calcus?
Instant Results
Every tool gives you results as you type — no submit button, no waiting.
100% Private
All calculations run in your browser. Your data never leaves your device.
Works Everywhere
Fully responsive design — use on phone, tablet, or desktop.
Always Free
No sign-up, no subscription, no hidden fees. 100+ tools, always free.
Accurate Formulas
Every calculator uses verified, standard formulas you can trust.
No Clutter
Clean interface focused on the tool — not ads or pop-ups in the way.
📰 Recent Articles
In-depth guides to help you get more from every tool
✨ Web Stories
Quick visual guides — swipe through in under a minute