Free Online Tools for Everyone
15+ fast, free, and privacy-friendly calculators and converters. No sign-up required — everything runs in your browser.
All Tools
Browse our complete collection of free online tools
🎓 Student Tools
View all →Attendance Calculator
Calculate your attendance percentage instantly
Percentage Calculator
Calculate percentages quickly and easily
CGPA to Percentage Converter
Convert CGPA to percentage and vice versa
Marks Needed Calculator
Calculate marks needed to reach your target
Study Timer (Pomodoro)
Pomodoro timer for productive study sessions
GPA Calculator
Calculate GPA from grades and credits
🛠️ Daily Tools
View all →Age Calculator
Calculate your exact age down to the day
Date Difference Calculator
Find the exact difference between two dates
Time Duration Calculator
Calculate hours and minutes between two times
Password Generator
Generate strong, secure passwords instantly
Random Number Generator
Generate random numbers in any range
Online Stopwatch
Precise online stopwatch with lap timing
BMI Calculator
Calculate Body Mass Index instantly
🔄 Converters
View all →💰 Finance Tools
View all →Why Calcora?
100% Private
All calculations happen in your browser. No data is ever sent to any server.
Lightning Fast
Instant results with no loading screens. Works offline too.
Completely Free
No sign-ups, no subscriptions, no hidden fees. Free forever.