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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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Compound Interest Calculator
Watch your money grow over time
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Simple Interest Calculator
Quick interest on principal amount
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SIP Calculator
Systematic investment plan returns
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Investment Calculator
Project your investment returns
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Retirement Calculator
Plan your retirement savings goal
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Savings Calculator
How fast will your savings grow?
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Inflation Calculator
Real value of money over time
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Profit Margin Calculator
Gross and net margin for any product
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ROI Calculator
Return on investment percentage
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Break-even Calculator
Units needed to cover your costs
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Discount Calculator
Final price after any percentage off
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Sales Tax Calculator
Add or remove tax from any amount
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Tip Calculator
Split bills and calculate tips easily
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Unit Price Calculator
Compare price per unit across pack sizes
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Fuel Cost Calculator
Trip cost, monthly fuel & EV comparison
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Stock Returns Calculator
CAGR, dividends & tax-adjusted returns
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Percentage Calculator
Calculate any percentage instantly
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Salary Calculator
Hourly, monthly and annual pay
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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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Water Intake Calculator
Daily hydration based on weight
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Body Fat Calculator
Estimate your body fat percentage
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Ideal Weight Calculator
Healthy weight range for your height
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Lean Body Mass Calculator
Your muscle and bone mass estimate
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Macro Calculator
Protein, carb, fat targets daily
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Pace Calculator
Speed, pace and finish time
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Running Pace Calculator
Min/mile pace for any distance
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Ovulation Calculator
Fertile window & ovulation day tracker
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One Rep Max Calculator
Estimate your maximum lift weight
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Pregnancy Due Date
Estimated delivery date calculator
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Ovulation Calculator
Fertile window and ovulation dates
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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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Remove Duplicate Lines
Clean repeated lines from text
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Remove Blank Lines
Strip empty lines from any text
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Sort Text
Sort lines alphabetically or reverse
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Reverse Text
Flip any text or string backwards
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Text Compare
Find differences between two texts
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Word Frequency Counter
Find most common words with % frequency
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Find & Replace
Replace words in bulk instantly
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Text Repeater
Repeat any text a set number of times
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Random Text Generator
Generate random words and sentences
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Lorem Ipsum Generator
Classic placeholder text for design
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Slug Generator
Convert text to URL-friendly slugs
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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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Hash Generator
SHA-1/256/384/512 for text and files
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JSON to CSV
Convert JSON arrays to CSV with preview
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CSV to JSON
Convert any CSV file to JSON array
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Password Strength Checker
Entropy, crack time & security score
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Regex Tester
Live highlight, groups, replace & pattern library
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Color Converter
HEX ↔ RGB ↔ HSL ↔ CMYK + palette generator
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Markdown Preview
Live Markdown editor with HTML export
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Diff Checker
Compare two texts — line & character diff
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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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Age Calculator
Exact age, next birthday, zodiac, age on other planets
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Pomodoro Timer
Focus sessions with audio alerts & task list
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Business Days Calculator
Count working days, add/subtract, US/UK/India holidays
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Scientific Calculator
Expression-based: sin, cos, log, factorial, constants
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Number Base Converter
Binary, octal, decimal, hex + bitwise AND/OR/XOR ops
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Roman Numeral Converter
Arabic ↔ Roman, vinculum notation, years, validator
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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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Speed Converter
mph, km/h, knots, Mach, m/s, speed of light
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Pressure Converter
Pa, PSI, bar, atm, mmHg, inHg
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Energy Converter
Joules, kWh, kcal, BTU, eV, ergs
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Data Storage Converter
Bits, bytes, KB, MB, GB, TB, PB — binary & decimal
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Time Converter
ns, ms, seconds, minutes, hours, days, years
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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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WEBP to JPG
Convert WEBP images to JPG
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JPG to WEBP
Convert JPG to modern WEBP format
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Image Rotator
Rotate images 90°, 180°, 270°
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Image Flipper
Flip images horizontally or vertically
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Image to Base64
Convert any image to Base64 string
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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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Currency Converter
50+ currencies with live exchange rates
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Budget Calculator
50/30/20 budget planner & savings analysis
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Tax Bracket Calculator
India new/old regime & US federal 2025
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Pregnancy Calculator
Due date, trimester & week-by-week milestones
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Sleep Calculator
Optimal bedtime & wake-up times by cycle
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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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Dice Roller
Roll any number of dice online
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Countdown Timer
Set a countdown for any duration
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Stopwatch
Online stopwatch with lap times
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Age Difference Calculator
Years, months, days between two ages
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Business Days Calculator
Count working days between dates
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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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CSV to JSON
Convert CSV to JSON with type casting
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Unit Price Calculator
Compare price per gram, litre or piece
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Fuel Cost Calculator
Trip cost, monthly expense & EV vs petrol
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Stock Returns Calculator
CAGR, dividends, tax & real return
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Pomodoro Timer
Focus timer with sessions & task list
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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.