104+ Free Calculators for Every Indian Need
Finance, Health, Math, Crypto and more
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
127 calculators across 8 categories
Finance
Loans, investments, taxes, and money
401(k) Calculator
Project your 401(k) balance at retirement with employer matching, salary growth, and 2026 IRS contribution limits applied year by year.
Auto Loan Calculator
Estimate your monthly car payment, total interest, and full amortization schedule from vehicle price, down payment, trade-in, sales tax, APR, and term.
Capital Gains Tax Calculator
Estimate 2026 federal tax on a stock, crypto, or property sale — short-term gains at ordinary rates vs long-term gains at 0%, 15%, or 20%.
CIBIL Score Estimator
Estimate where your CIBIL score sits based on credit habits — utilisation, payment history, account age, and inquiries.
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
Assignment Weight
Effect of assignment on final grade.
Attendance Calculator
Classes you can skip safely.
CGPA Calculator
Calculate cumulative GPA across semesters.
Class Rank Calculator
Your percentile in class.
Business
ROI, margins, and SaaS metrics
Most Popular
Top calculators of all time
401(k) Calculator
Project your 401(k) balance at retirement with employer matching, salary growth, and 2026 IRS contribution limits applied year by year.
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.
Assignment Weight
Effect of assignment on final grade.
Start Calculating in Seconds Beautifully.
Pick a category, enter your numbers, and get clear results with step-by-step explanations. No charges, no ads in the way of your work.
Explore All 127 ToolsExplore 127 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 a hundred more 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.
8 Categories, 104+ Tools
The site covers Finance, Health, Math, Crypto, Daily Life, Engineering, Business 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, solve a quadratic equation for board exam practice or convert kilometres to miles for a fitness goal, 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, NIST and SI for unit conversions, 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 runs on Google AdSense for funding, which keeps the calculators free for students, salaried professionals, parents, traders and small business owners across India. If you spot an error or want a new calculator added, write to us at allsmartcalculators@gmail.com.