Free • instant • no sign-up
Numbers in. Answers out.
Money, marks, shopping, health and everyday decisions — get the number you need without opening a spreadsheet.
CGPA calculator
Built for college students — enter subjects and credits, get your CGPA and percentage instantly.
Try it →36
Your shortcut to the answer
What are you calculating?
Pick a tool, drop in your numbers, and get a clear result instantly.
CGPA
10-point CGPA & percentage for college students.
Σ(Grade Point × Credits) ÷ Σ(Credits)OpenPercentage
Percent of a number, share, or change.
(X ÷ 100) × YOpenDiscount
Sale price after a percentage off.
Price × (1 − Discount%)OpenTip splitter
Tip and per-person bill split.
Bill × (1 + Tip%) ÷ PeopleOpenLoan / EMI
Monthly payment on a fixed loan.
P × r(1+r)ⁿ ÷ ((1+r)ⁿ−1)OpenInterest
Simple vs. compound interest.
SI = P×r×t · CI = P(1+r/n)ⁿᵗ−POpenGST / Tax
Add or remove sales tax.
Price × (1 + GST%)OpenBMI
Body mass index and category.
Weight(kg) ÷ Height(m)²OpenAge
Exact age between two dates.
(Today − DOB) → Years, Months, DaysOpenAverage
Mean, sum, and range of a list.
x̄ = Σx ÷ nOpenGPA
Weighted GPA from your courses.
Σ(Grade × Credits) ÷ Σ(Credits)OpenFind the right tool
Calculators for study, money, health and everyday life
Every calculator has its own page with the formula, step-by-step instructions, worked examples and answers to common questions.
For students
Add up your semester with the CGPA calculator for the 10-point scale, or use the GPA calculator for the 4.0 scale. The percentage calculator turns marks into a percentage and the average calculator finds the mean of any list of scores.
For money decisions
Check a monthly payment with the EMI calculator, compare simple and compound interest, add or remove tax with the GST calculator, and see what a sale really costs with the discount calculator.
For health and daily life
Work out your body mass index with the BMI calculator, find an exact age in years, months and days with the age calculator, and split a restaurant bill fairly with the tip calculator.
Built for accuracy
Every formula here — EMI, compound interest, BMI, GPA — follows the standard method used by banks, schools, and health guidelines.
Works on any device
No app, no install. Open it on your phone at the checkout counter or on a laptop while doing your taxes.
Nothing leaves your browser
Every calculation runs locally in JavaScript. Numbers you type are never sent anywhere or stored.
Common questions
Quick answers. Zero jargon.
Everything you need to know before you trust the number.
Is Onlinecalculatorworks actually free?
Yes. Every calculator on this site is free to use, with no sign-up, no account, and no usage limits.
Do you store the numbers I type in?
The calculations run locally in your browser. This site does not send calculator inputs to its own application server.
How accurate are the results?
Each tool uses the standard formula for that calculation — the same reducing-balance EMI formula banks use, the same BMI ranges used in health guidelines, and so on. That said, none of these tools replace personalized advice from a bank, doctor, or tax professional.
Can I use these calculators on my phone?
Yes — the site is fully responsive and works the same way on a phone, tablet, or desktop browser, with no app to install.
Will more calculators be added?
Yes, this list keeps growing. If there's a calculator you'd like to see, let us know through the contact page.