Free online tools that just work
Fast, private calculators and converters. Everything runs in your browser.
Popular tools
The tools people use the most
Mobile Number Sum Calculator
Calculate the sum of digits in a mobile number. Useful for numerology, pattern analysis, and mathematical calculations.
Expiry Date Calculator
Simple calculator to determine expiry dates based on purchase date and shelf life. Supports multiple time units and date formats for easy calculation.
Cashback Calculator
Calculate cashback rewards, annual savings, and compare different cashback rates. Perfect for credit cards, shopping rewards, and financial planning.
PX to VW Converter
Convert between pixels and viewport width units (vw). Perfect for responsive design and fluid layouts.
PX to Inches Converter
Convert between pixels and inches. Perfect for print layouts, physical design specifications, and design software.
PX to Percentage Converter
Convert between pixels and percentages based on container width. Perfect for responsive layouts and CSS grid systems.
Screen Resolution Tool
Detect your screen resolution, convert between units, calculate aspect ratios, and get responsive breakpoints. Essential for developers and designers.
Text Case Converter
Convert text between different cases: UPPERCASE, lowercase, Title Case, and more.
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Open full list- Base64 Encoder / Decoder
- JSON to CSV Converter
- JSON Formatter
- CSS Minifier
- HTML Formatter
- Hash Generator
- UUID Generator
- Epoch / Unix Timestamp Converter
- JWT Decoder
- Regex Tester
- Cron Expression Generator
- Barcode Generator
- CSS Grid Generator
- Tailwind Grid Generator
- Meta Tag Generator
- Fluid Type Scale Generator
- CSS Gradient Generator
- CSS Text Gradient Generator
- Word to HTML Converter
- SVG Viewer & Converter
- PX to EM Converter
- PX to REM Converter
- PX to Percentage Converter
- PX to PT Converter
- PX to Inches Converter
- PX to VW Converter
- PX to VH Converter
- URL Encoder/Decoder
- Color Converter
- Length Converter
- Weight Converter
- Temperature Converter
- Speed Converter
- Area Converter
- Volume Converter
- Data Storage Converter
- Time Converter
- Shoe Size Converter
- Screen Resolution Tool
- Take-home Salary Calculator
- Income Tax Calculator (India)
- EMI Calculator
- SIP Calculator
- PPF Calculator
- Sukanya Samriddhi Yojana Calculator
- FD Calculator
- RD Calculator
- NSC Calculator
- Gratuity Calculator
- EPF Calculator
- NPS Calculator
- Gold Jewellery Price Calculator
- Silver Price Calculator
- Gold Purity & Karat Calculator
- Gold Weight Converter
- GST Calculator
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From our guides
Plain-English explainers behind the numbers.
6 min read
Calorie Needs Explained: BMR, TDEE, and Your Daily Calories
What BMR and TDEE mean, how your daily calorie need is estimated from your body and activity, and how to set a target for losing, maintaining, or gaining weight.
6 min read
GST Explained: How India’s Goods and Services Tax Is Calculated
What GST is, the tax slabs, the difference between GST-inclusive and GST-exclusive prices, and how to add or extract GST from an amount with worked examples.
6 min read
Ovulation and the Fertile Window, Explained
When ovulation happens, what the “fertile window” really means, and how to estimate your most fertile days from your cycle — plus the body signs that confirm it.
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