✅ Last updated: August 12, 2026
📏
Length Converter
km, miles, feet, inches, cm
⚖️Weight Converter
kg, lbs, oz, grams, stones
🌡️Temperature Converter
Celsius, Fahrenheit, Kelvin
📐Area Converter
sq ft, acres, hectares, sq meters
🧪Volume Converter
liters, gallons, cups, ml
💨Speed Converter
mph, km/h, m/s, knots
🔧Pressure Converter
PSI, bar, kPa, atmospheres
⚡Energy Converter
joules, kWh, calories, BTU
💾Data Storage Converter
GB, TB, MB, KB, bits
⏱️Time Converter
hours, minutes, seconds, days
Frequently Asked Questions
Yes, 100% free. No subscription, no credits, no watermark, no file size limit. Every tool on Calcus is free forever.
Completely. All processing happens in your browser. No files or data are sent to any server. Your inputs never leave your device.
Most tools work offline after the first load since they run entirely in JavaScript. Calculator tools, converters, and text tools all work without internet.