Smart Calculators
For Everyday Life
87 free online calculators and converters to solve everyday problems instantly. Fast, accurate and easy to use.
Most Popular Calculators
View allMortgage Calculator
Free mortgage calculator to estimate your monthly home loan payment, total interest and total cost. Accurate, fast and easy to use.
Loan Calculator
Free loan calculator for personal, auto and student loans. Calculate your monthly payment, total interest and total repayment instantly.
EMI Calculator
Free EMI calculator for home, car and personal loans. Calculate your Equated Monthly Installment, total interest and total payment online.
Compound Interest Calculator
Free compound interest calculator with monthly contributions. See how your money grows with daily, monthly, quarterly or yearly compounding.
SIP Calculator
Free SIP calculator. Estimate the future value of your monthly mutual fund SIP investments with expected returns and total wealth gained.
Discount Calculator
Free discount calculator. Find the sale price and amount saved after a percentage discount, with optional sales tax.
Tip Calculator
Free tip calculator. Calculate the tip amount and split the bill between any number of people instantly.
Inflation Calculator
Free inflation calculator. See how the purchasing power of money changes over time at any average inflation rate.
Sales Tax Calculator
Free sales tax calculator. Add sales tax to a price or extract the tax from a tax-inclusive total at any rate.
Auto Loan Calculator
Free auto loan calculator. Estimate your monthly car payment including down payment, trade-in, sales tax and interest.
Why people use Calculator Gi
100% Free
Every tool is free, with no sign-up and no limits
Accurate Results
Standard, documented formulas — shown on every page
Mobile Friendly
Works on phones, tablets and desktops
Privacy Focused
Calculations run in your browser, never uploaded
Always Updated
New calculators added and improved regularly
How it works
- 1
Choose a calculator
Search or browse by category to find the tool you need.
- 2
Enter your values
Fill in the fields — every input explains what it expects.
- 3
Get instant results
Results update as you type, with the formula explained below.
Bookmark us
Keep 87 calculators one tap away. Press Ctrl + D (or ⌘ + D on Mac), or add this page to your phone's home screen from the browser menu.
Browse all toolsLatest Guides
All articlesFinance
What Is Inflation and How to Protect Your Money From It
Inflation quietly shrinks your savings every year. Here's how it works, how it's measured, and the practical ways to keep your money's value.
8 min read
Finance
How to Calculate EMI on a Home Loan: Formula, Examples and Smart Prepayment Strategy
Learn exactly how home loan EMI is calculated, how interest and principal split over time, and the prepayment strategies that save the most money.
8 min read
Health
BMI vs. Body Fat Percentage: Which Number Actually Matters for Your Health?
BMI and body fat percentage often disagree. Learn what each measures, where each fails, and which targets are actually worth pursuing.
7 min read
Finance
Compound Interest Explained: Why Starting 10 Years Earlier Beats Investing Twice as Much
A practical guide to compound interest — the formula, the rule of 72, and real examples showing why time beats contribution size.
7 min read
The calculator site that respects your time
Calculator Gi brings together accurate, fast and genuinely free online calculators for every part of life. Plan a mortgage or EMI, estimate your income tax, check your BMI and daily calories, work out a percentage, use the scientific calculator, plot functions on the graphing calculator, or generate QR codes — all in one place, with no sign-ups, no paywalls and no clutter.
Popular tools include the loan calculator, age calculator, compound interest calculator, GPA calculator, SIP calculator and our unit converters. Every tool is built mobile-first and runs instantly in your browser, so results update as you type — and each one explains the formula behind it and how to use it.
We add new calculators continuously. If there is a tool you wish existed, tell us — the best ideas come from the people who use the site every day.
Frequently Asked Questions
▸Are all the calculators really free?
Yes — every calculator, converter and tool on Calculator Gi is completely free, with no sign-up, no download and no usage limits. They work on phones, tablets and desktops.
▸How accurate are the calculators?
Each calculator uses standard, documented formulas — for example the amortization formula for loans, Mifflin-St Jeor for calories and WHO ranges for BMI. Results are estimates for information purposes and not professional financial or medical advice.
▸Do the calculators work offline or on mobile?
All tools are mobile-first and run instantly in your browser. Once a page is loaded, calculations happen on your device — nothing is sent to a server.
▸Is my data stored anywhere?
No. Values you enter are processed locally in your browser and never uploaded. Your privacy is protected by design.