About
What is CalcKit?
CalcKit is a free utility site built for students and academics who need quick, reliable calculations without distractions. No ads, no sign-ups, no clutter — just the tools you need, working exactly as expected.
Available Tools
Age Calculator
Find your exact age in years, months, and days — plus total weeks and days.
Percentage Calculator
Basic percentages, percentage increase/decrease, and percentage difference.
BMI Calculator
Calculate Body Mass Index using metric or imperial units with category reference.
GPA Calculator
Enter courses, grades, and credit hours to calculate your GPA on a 4.0 scale.
Scientific Calculator
Trigonometry, logarithms, powers, factorials and more — with calculation history.
Unit Converter
Convert length, weight, temperature, area, volume, speed, and time instantly.
Our approach
Every tool on CalcKit is designed around one principle: give you the answer clearly and quickly, with enough context to understand it. Results show the formula or breakdown so you can verify the working — useful when studying or double-checking exam prep.
More tools are on the way. If there's a calculator you'd find useful for academic work, the site is built to grow.
Ready to get started?
View all calculators