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Free Online Calculators

Use free online calculators for math, percentage, attendance, EMI, SIP, train fares, GST and more. Fast, simple and easy-to-use calculation tools for students, professionals, and everyone.

200+
Free Calculators
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Daily Users
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Attendance Calculators

Check 75% attendance, calculate required days, plan your schedule

75% Attendance Calculator
Check 75% requirement
Attendance Calculator for College
College students tool
How Many Days Can I Bunk
Bunk planning calculator
How Many Classes Can I Miss
Miss calculator
Attendance Shortage Calculator
Find attendance deficit
Engineering Attendance
AICTE 75% tool

Percentage Calculators

Calculate percentages, marks, increases, decreases instantly

Percentage Calculator
All percentage operations
Marks Percentage Calculator
From marks to %
Exam Marks Percentage
Exam score calculator
Percentage of a Number
Find X% of Y
Percentage Increase Calculator
Calculate % growth
Percentage Decrease Calculator
Calculate % reduction
Percentage Difference
Compare two numbers
Calculate % from Marks
Quick formula

Loan EMI Calculators

Calculate EMI for home, car, bike and personal loans

EMI Calculator
General loan EMI
Home Loan EMI India
Housing loan EMI
Car Loan EMI India
Auto loan EMI
Bike Loan EMI India
Two-wheeler loan
5 Lakh Loan EMI
₹5 lakh EMI
10 Lakh Loan EMI
₹10 lakh EMI
5 Lakh Personal Loan
Personal loan EMI
10 Lakh Home Loan
Housing finance
Monthly EMI Calculator
Monthly payment

SIP & Investment Calculators

Plan mutual fund SIP, calculate returns and maturity

SIP Calculator
Mutual fund SIP returns
SIP for ₹5000/Month
₹5000 SIP returns
SIP for ₹10000/Month
₹10000 SIP returns
SIP for 10 Years
10 year SIP
SIP Maturity Calculator
Maturity amount
Monthly SIP Return
Monthly returns
SIP Return India
India-specific SIP
Step Up SIP Calculator
Step-up SIP
Lumpsum Calculator
One-time investment

Train Fare Calculators

Calculate Indian railway ticket prices by distance and class

Train Fare Calculator India
Indian railway fare
Indian Railway Fare
IRCTC ticket price
Train Ticket Fare
Check ticket price
Railway Ticket Price
Fare check
Sleeper Class Fare
SL ticket price
3AC Fare Calculator
Third AC fare
Sleeper Ticket Fare
SL fare check
Fare Per KM India
Rate per kilometer

GST & Tax Calculators

Calculate GST inclusive/exclusive prices, reverse GST

GST Calculator
GST inclusive/exclusive
GST Reverse Calculator
Find GST from total
GST Inclusive Price
Add GST to amount
Income Tax Calculator
Tax calculation
HRA Calculator
HRA exemption
TDS Calculator
TDS deduction

Student & Academic Calculators

CGPA, SGPA, marks, percentage converters for students

CGPA to Percentage
Convert CGPA
SGPA to Percentage
Convert SGPA
SGPA Calculator
Calculate SGPA
GPA Calculator
General GPA calc
SSLC Percentage
SSLC marks %
IGNOU Percentage
IGNOU marks %

Everyday Calculators

Age, date, salary, BMI, fuel and daily use calculators

Age Calculator
Exact age from DOB
Exact Age Calculator
Precise age
Date Calculator
Days between dates
Working Days Calculator
Business days
In Hand Salary India
Take home salary
Fuel Cost Calculator
Petrol/diesel cost
BMI Calculator
Body mass index
Mileage Calculator India
Vehicle mileage

Why CalculatorForAll.online?

CalculatorForAll.online is your one-stop destination for free online calculators. Whether you are a student checking your attendance percentage, a professional calculating loan EMI, or anyone needing quick math answers, our tools give you instant results without any hassle.

Every calculator on our platform is designed to be fast, accurate, and easy to use. No registration, no downloads, no hidden fees. Simply pick a calculator, enter your numbers, and get results immediately. All calculations happen in your browser — your data never leaves your device.

Popular Calculator Categories

  • Attendance Calculators: Check 75% attendance, find how many days you can bunk, calculate shortage, and plan your semester. Essential for college and engineering students.
  • Percentage Calculators: Calculate marks percentage, percentage increase/decrease, percentage difference, and find X% of any number. Perfect for students and professionals.
  • EMI Calculators: Calculate monthly EMI for home loan, car loan, bike loan, and personal loan in India. Compare interest rates and plan repayments.
  • SIP Calculators: Plan mutual fund SIP investments, calculate maturity amount, and see how your money grows over time with compounding returns.
  • Train Fare Calculators: Check Indian railway ticket prices for any route. Covers Sleeper, 3AC, 2AC, and 1AC classes with accurate fare estimates.
  • GST Calculators: Calculate GST inclusive/exclusive prices, reverse GST from total, and compute CGST/SGST for all GST slabs (5%, 12%, 18%, 28%).
  • Student Calculators: Convert CGPA/SGPA to percentage, calculate GPA, and find marks percentage. Support for all Indian universities.
  • Everyday Calculators: Age calculator, date difference, working days, salary calculator, BMI, fuel cost, and more daily use tools.

How Our Calculators Work

Our calculators use industry-standard formulas to deliver accurate results. EMI calculations follow the reducing balance method used by all Indian banks. SIP calculations use the future value of annuity formula. Attendance calculators use the standard percentage formula. Train fares are based on Indian Railway's distance-based fare structure.

Each calculator is optimized for mobile-first design, ensuring a seamless experience on smartphones, tablets, and desktops. The clean interface, instant calculations, and visual results make our tools the preferred choice for millions of users across India.

Who Uses CalculatorForAll.online?

Our calculators serve a wide audience: college students tracking attendance and calculating marks, engineering students meeting AICTE requirements, working professionals planning loans and investments, homemakers calculating grocery budgets with GST, and travellers checking train fares. Whatever your calculation need, we have a tool for you.

Frequently Asked Questions

What is CalculatorForAll.online?
CalculatorForAll.online is a free online platform offering a wide range of calculators including math, finance, student, and everyday tools. All calculators are 100% free, mobile-friendly, and require no registration. You can use attendance calculators, EMI calculators, SIP calculators, percentage calculators, GST calculators, train fare calculators, and more — all in one place.
Are these online calculators really free?
Yes, all calculators on CalculatorForAll.online are completely free to use. There are no hidden charges, no subscription fees, and no registration required. You can use any calculator unlimited times. All calculations happen in your browser, so your data stays private and secure.
Which calculators are available on this website?
We offer 200+ calculators across multiple categories: Attendance Calculators (75%, college, engineering), Percentage Calculators (marks, increase, decrease, difference), EMI Calculators (home loan, car loan, bike loan, personal loan), SIP Calculators (mutual fund, maturity), Train Fare Calculator (Indian railway), GST Calculator, Age Calculator, Date Calculator, Salary Calculator, BMI Calculator, and many more.
How do I use the percentage calculator?
To use the percentage calculator, visit the percentage calculator page, enter the value and the percentage you want to calculate, and click calculate. You can find X% of a number, calculate percentage increase or decrease, find percentage difference between two numbers, or calculate percentage from marks. Results appear instantly.
Can I use these calculators on my mobile phone?
Absolutely! All calculators on CalculatorForAll.online are fully mobile-responsive and work perfectly on smartphones, tablets, laptops, and desktops. The design adapts to any screen size, giving you the same fast and accurate results on mobile as on desktop.
How accurate are the EMI calculations?
Our EMI calculators use the standard EMI formula: EMI = P × r × (1+r)^n / ((1+r)^n - 1), which is the same formula used by banks and financial institutions. The results are highly accurate for planning purposes. However, actual EMI may vary slightly depending on the bank's specific calculation method and processing fees.
What is the SIP calculator and how does it work?
The SIP (Systematic Investment Plan) calculator estimates the maturity amount of your mutual fund SIP investments. Enter your monthly SIP amount, expected annual return rate, and investment tenure. The calculator uses the formula M = P × [{(1+i)^n - 1} ÷ i] × (1+i) to compute your estimated returns and maturity amount.
How accurate is the Indian train fare calculator?
Our train fare calculator provides approximate fares based on Indian Railway's distance-based fare structure. It covers Sleeper (SL), 3AC, 2AC, and 1AC classes with reservation charges and GST. Actual fares may vary slightly due to dynamic pricing, special trains, or route-specific charges. Use it as a reliable estimate before booking on IRCTC.
Is my data safe when using these calculators?
Yes, your data is completely safe. All calculations are performed locally in your browser using JavaScript. No data is sent to any server. We do not store, track, or share any information you enter into our calculators. Your privacy is our priority.
How often are the calculators updated?
We regularly update our calculators to reflect the latest rates and rules. Tax calculators are updated with the latest income tax slabs, GST rates are kept current, train fares are updated with Indian Railway fare revisions, and loan calculators reflect current interest rate ranges. Last updated: August 2026.