Fast, Free Tools for Students, Exams, Careers & Life.
Calculate JEE percentiles, convert CGPAs, track 75% college attendance, decode your CTC in-hand salary, and compute loan EMIs instantly.
Most Popular Calculators
The most frequently used utilities by Indian students and working freshers.
JEE Main Marks to Percentile Estimator
Estimate JEE Main percentile range from your marks.
JEE Main Percentile to Rank Estimator
Estimate All India CRL and Category rank from NTA percentile.
JEE College Predictor
Predict NITs, IIITs, and GFTIs based on your JEE rank.
JEE Marks Calculator
Compute total score and accuracy with +4 / -1 negative marking.
CGPA to Percentage Calculator
Convert CGPA to percentage using standard Indian university rules.
Percentage Calculator
Calculate X out of Y, percentage increase, decrease, and difference.
JEE & Competitive Exams
Accurate marks, percentile, rank estimators, cutoff insights and session countdowns for JEE Main and Advanced aspirants.
JEE Main Marks to Percentile Estimator
Estimate JEE Main percentile range from your marks.
JEE Main Percentile to Rank Estimator
Estimate All India CRL and Category rank from NTA percentile.
JEE College Predictor
Predict NITs, IIITs, and GFTIs based on your JEE rank.
JEE Cutoff Explorer
Search opening and closing cutoffs across institutes and branches.
Student & Academic Tools
Essential calculators for CGPA conversion, attendance tracking, marks percentages, weighted GPA, and exam target planning.
CGPA to Percentage Calculator
Convert CGPA to percentage using standard Indian university rules.
Percentage Calculator
Calculate X out of Y, percentage increase, decrease, and difference.
Marks Percentage Calculator
Multi-subject marks percentage and grade aggregator.
GPA Calculator
Calculate weighted GPA from course credit hours and grade points.
Career & Salary Tools
Transparent Indian CTC to in-hand take-home breakdowns, salary increments, PF projections, and stipend estimates.
CTC to In-Hand Salary Calculator
Break down annual CTC into estimated monthly in-hand take-home salary.
Monthly to Annual Salary Calculator
Convert monthly salary to annual, weekly, and hourly pay.
Annual to Monthly Salary Calculator
Convert annual package (LPA) to monthly gross salary.
Salary Hike Calculator
Compute your new salary and increment amount from a hike percentage.
Finance Calculators
Smart financial tools for loan EMI schedules, mutual fund SIP wealth creation, GST split, FD/RD returns, and Income Tax estimates.
EMI Calculator
Calculate loan EMI, total interest, and yearly amortization schedule.
SIP Calculator
Project mutual fund SIP returns, invested amount, and wealth gain.
GST Calculator
Calculate GST inclusive/exclusive amounts with CGST/SGST split.
Fixed Deposit (FD) Calculator
Calculate bank FD maturity amount with quarterly compounding.
Everyday & General Calculators
Reliable daily utilities including scientific expressions, age calculation, unit conversion, date difference, discounts, and BMI.
Age Calculator
Calculate exact age in years, months, days, and birthday countdown.
BMI Calculator
Calculate BMI and healthy weight ranges for your height.
Scientific Calculator
Full-featured scientific calculator with trig, log, roots, and power.
Unit Converter
Convert length, mass, temperature, area, speed, and digital units.
Designed as a Reliable Utility Platform, Not an Ad Farm.
We built StudentTools with four fundamental engineering principles to respect your time and device.
Instant Client-Side Speed
Calculations execute in your browser with zero latency and zero server round-trips.
Transparent Formulas
Every calculation reveals its exact mathematical formula, assumptions, and realistic error margins.
Mobile-First Usability
Designed for quick thumb taps on smartphone screens without zooming, clutter, or annoying popups.
Indian Context Native
Tuned specifically for JoSAA rounds, CBSE 9.5x CGPA rules, Indian CTC structures, and Indian Income Tax slabs.
Frequently Asked Questions
Yes, 100% free. Every calculator on StudentTools is open for public access without paywalls, sign-up forms, or limits.