Free Online Calculators for Every Indian Need
Finance, Health, Math & Education
From EMI and SIP to BMI and GPA, get accurate answers in seconds. All tools are free, work in your browser, and need no signup.
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Age Calculator
Calculate your exact age in years, total months, and total days from any date of birth — accurate down to the day.
Attendance Calculator
Classes you can skip safely.
BMI Calculator
Calculate your Body Mass Index in seconds — with WHO categories and Asian-specific cutoffs.
Calorie Calculator
Daily calorie needs to maintain, lose, or gain weight — based on your BMR and activity level.
Compound Interest Calculator
See how a one-time principal grows under compound interest at any rate, tenure, and compounding frequency (daily, monthly, quarterly, yearly).
Crypto Profit Calculator
Calculate profit, loss, and percent return on any crypto trade — Bitcoin, Ethereum, or altcoins — from buy price, sell price, and quantity.
Crypto Tax Calculator
Estimate capital gains tax on crypto.
Currency Converter
Convert between 30 major world currencies instantly with reference rates — see the converted amount, exchange rate, and inverse rate.
Browse by Category
140 calculators across 8 categories
Finance
Loans, investments, taxes, and money
CIBIL Score Estimator
Estimate where your CIBIL score sits based on credit habits — utilisation, payment history, account age, and inquiries.
Compound Interest Calculator
See how a one-time principal grows under compound interest at any rate, tenure, and compounding frequency (daily, monthly, quarterly, yearly).
Credit Card Interest
How much credit card interest will cost you.
Currency Converter
Convert between 30 major world currencies instantly with reference rates — see the converted amount, exchange rate, and inverse rate.
Health
BMI, calories, fitness and wellness
Age Calculator
Calculate your exact age in years, total months, and total days from any date of birth — accurate down to the day.
BMI Calculator
Calculate your Body Mass Index in seconds — with WHO categories and Asian-specific cutoffs.
BMR Calculator
Calculate your Basal Metabolic Rate — the calories your body burns at complete rest.
Body Fat %
Estimate body fat percentage.
Math
Scientific, statistical, and calculus
Crypto
Bitcoin, staking, DeFi and trading
Bitcoin Mining Calculator
Estimate Bitcoin mining profitability.
Crypto Converter
Convert crypto to USD.
Crypto Profit Calculator
Calculate profit, loss, and percent return on any crypto trade — Bitcoin, Ethereum, or altcoins — from buy price, sell price, and quantity.
Crypto Tax Calculator
Estimate capital gains tax on crypto.
Engineering
Electrical, mechanical, and civil
Concrete Calculator
Calculate concrete volume for slabs.
Electrical Power
Calculate electrical power (P = VI).
Gear Ratio Calculator
Calculate gear ratios and output RPM.
Ohm's Law Calculator
V = IR, find voltage, current, or resistance.
Daily Life
Tips, travel, cooking and more
Carpet & Tile Calculator
Flooring area and boxes needed.
Cooking Conversion
Convert cups, tablespoons, grams.
Countdown Calculator
Time remaining until an event.
Date Calculator
Add or subtract days, weeks, months, or years from any date — with an optional business-days mode that skips weekends.
Education
GPA, grades, and study tools
AKTU CGPA to Percentage Calculator
Convert your AKTU (UPTU) CGPA to a percentage using the (CGPA − 0.75) × 10 rule from the B.Tech ordinance, and see which division that puts you in.
Anna University CGPA to Percentage Calculator
Convert Anna University CGPA to a percentage. Anna University uses a straight CGPA × 10 with no deduction — this shows exactly what that means for your marks.
Assignment Weight
Effect of assignment on final grade.
Attendance Calculator
Classes you can skip safely.
Business
ROI, margins, and SaaS metrics
Most Popular
Top calculators of all time
Ad ROAS Calculator
Return on ad spend.
Age Calculator
Calculate your exact age in years, total months, and total days from any date of birth — accurate down to the day.
AKTU CGPA to Percentage Calculator
Convert your AKTU (UPTU) CGPA to a percentage using the (CGPA − 0.75) × 10 rule from the B.Tech ordinance, and see which division that puts you in.
Anna University CGPA to Percentage Calculator
Convert Anna University CGPA to a percentage. Anna University uses a straight CGPA × 10 with no deduction — this shows exactly what that means for your marks.
From the Blog
Practical guides behind the numbers
SIP vs Lumpsum: The Same ₹12 Lakh Ends ₹14 Lakh Apart, and When Each One Wins
₹12 lakh at 12% for ten years grows to ₹37.3 lakh as a lumpsum and ₹23.2 lakh as a ₹10,000-a-month SIP. The gap is not a flaw in SIPs; it is the same money arriving later. When each wins, the falling-market case for SIP, and what to do with a bonus.
How to Calculate GST: Adding It, Extracting It and Splitting CGST, SGST and IGST
Add 18% to ₹10,000 and you get ₹11,800. Ask what GST is inside ₹11,800 and the answer is ₹1,800, not the ₹2,124 you get by taking 18% of the total. The arithmetic for both directions, the CGST/SGST/IGST split, and the two-slab structure in force since 22 September 2025.
Crypto Tax in India: The 30% Rule, the 1% TDS, and Why a ₹40,000 Loss Does Not Reduce Your Bill
Gain ₹1,00,000 on one coin, lose ₹40,000 on another, and your tax is ₹31,200, not ₹18,720: a 52% rate on what you actually made. How Section 115BBH works, when the 1% TDS applies, what goes in Schedule VDA, and how gifts, airdrops and staking are treated.
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Explore All 140 ToolsExplore 140 ToolsWhy AllSmartCalculators?
AllSmartCalculators is a free online toolkit built for everyday Indian needs: home loan EMIs, SIP returns, GST on a bill, GPA conversions, BMI checks, age in days, percentage of a number, and more of the sums you do every week. Every calculator works directly in your browser, on phone or laptop, with no signup, no app install and no hidden charges.
Finance, Health, Math & Education
The site covers Finance, Health, Math and Education. Whether you need to work out the EMI on a Rs 35 lakh home loan, compare the old and new income tax regime, plan a 15-year SIP for your child's college, check BMI for an Indian adult, work out the GST on a bill or calculate your GPA for the semester, there is a dedicated tool for it.
Built for Accuracy and Privacy
Formulas are based on trusted sources: RBI for interest computations, GSTN for tax slabs, WHO for BMI bands, and SEBI guidance for mutual fund return assumptions. Inputs you type stay on your device for the calculation itself, and we follow privacy practices that line up with Google Consent Mode v2, GDPR and India's DPDP Act.
How to Get Started
Pick a category from the menu, open the calculator you need, enter your numbers, and read the result along with the step-by-step working shown below. Bookmark your most-used tools (EMI, SIP, BMI, percentage) so you can come back in one click.
Free, Fast, Honest
There is no paywall, no premium tier and no spammy email funnel. The site is funded by unobtrusive ads, which keeps the calculators free for students, salaried professionals, parents and small business owners across India. Spot an error or want a new calculator added? Email us at allsmartcalculators@gmail.com and we'll take a look.