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Finance, tax, health, math, business and date calculators — all instantly available in your browser. No app download, no signup, no ads. Every calculation stays on your device.
45+ Free Calculators — Every Category
Pick a category or scroll through all — every calculator runs instantly in your browser, free forever.
Finance Calculators
EMI, SIP, FD, investment growth and loan calculators
EMI Calculator
Calculate monthly EMI for home loan, car loan or personal loan. Enter principal, interest rate and tenure to get exact EMI, total interest and payment schedule.
SIP Calculator
Find the future value of your monthly SIP investment. See how ₹5,000/month grows over 10 years with compound returns. Includes XIRR and goal-based planning.
Compound Interest Calculator
Calculate compound interest for any investment with custom compounding frequency — daily, monthly, quarterly or yearly. Visualise growth over time.
FD Calculator
Calculate Fixed Deposit maturity amount and interest earned. Supports simple and compound interest, quarterly compounding and TDS deduction.
PPF Calculator
Calculate PPF maturity value for 15-year lock-in with the current 7.1% interest rate. Add custom yearly deposits and see year-by-year growth.
ROI Calculator
Calculate return on investment percentage from cost and revenue. Works for business investments, marketing spends, stock trades and real estate.
Tax & Salary Calculators
GST, income tax, HRA, salary and payroll calculations
GST Calculator
Add or remove GST from any amount. Supports all GST slabs — 5%, 12%, 18%, 28%. Shows CGST, SGST and IGST breakup instantly.
Income Tax Calculator
Calculate income tax for FY 2024-25 under both old and new tax regime. Supports all deductions — 80C, 80D, HRA, LTA and more. Compares both regimes side-by-side.
Salary Calculator (CTC to In-hand)
Enter CTC and get exact monthly in-hand salary after PF, professional tax, TDS and all deductions. Shows full salary slip breakdown.
HRA Calculator
Calculate HRA exemption under Section 10(13A). Enter basic salary, actual HRA received and rent paid to find your maximum tax-exempt HRA.
TDS Calculator
Calculate TDS on salary, rent, professional fees, FD interest and contract payments. Find applicable TDS rate and deductible amount for any payment type.
Gratuity Calculator
Calculate gratuity amount as per the Payment of Gratuity Act. Enter last drawn salary and years of service to find your eligible gratuity payout.
Health Calculators
BMI, BMR, calorie, ideal weight and fitness calculators
BMI Calculator
Calculate Body Mass Index from height and weight. Supports metric (kg/cm) and imperial (lb/ft). Shows BMI category — underweight, normal, overweight or obese.
Calorie Calculator
Find your daily calorie needs (TDEE) based on age, gender, height, weight and activity level. Get separate targets for weight loss, maintenance and muscle gain.
BMR Calculator
Calculate Basal Metabolic Rate — calories your body burns at complete rest. Uses both Mifflin-St Jeor and Harris-Benedict equations. Foundation for any diet or fitness plan.
Age Calculator
Calculate your exact age in years, months, days, hours and minutes from your date of birth. Find out day of the week you were born and days until next birthday.
Water Intake Calculator
Find your recommended daily water intake based on weight, activity level and climate. Get reminders schedule and track hydration for better health.
Ideal Weight Calculator
Find your ideal body weight range using five medical formulas — Robinson, Miller, Hamwi, Devine and BMI method. Includes healthy weight range for your height.
Math & Science Calculators
Percentage, fractions, statistics, conversions and more
Percentage Calculator
Three modes: What is X% of Y? · X is what % of Y? · % change from X to Y. Handles discounts, tax, tips and growth rates in one calculator.
Scientific Calculator
Full-featured scientific calculator with trigonometry (sin, cos, tan), logarithms (log, ln), exponents, square roots, factorials and memory functions.
Fraction Calculator
Add, subtract, multiply and divide fractions. Automatically simplifies to lowest terms and converts between mixed numbers, improper fractions and decimals.
Unit Converter
Convert between all common units — length, weight, temperature, area, speed, volume and more. Supports metric and imperial systems with live conversion.
Average & Statistics
Calculate mean, median, mode, range and standard deviation for any dataset. Paste comma-separated numbers and get a full statistical summary instantly.
LCM & HCF Calculator
Find Lowest Common Multiple and Highest Common Factor (GCD) for 2 or more numbers. Shows step-by-step solution using prime factorisation and Euclidean algorithm.
Business Calculators
Profit margin, break-even, markup and digital marketing calculators
Profit Margin Calculator
Calculate gross profit margin, net profit margin and markup percentage. Enter cost and selling price to find profitability instantly. Essential for pricing strategy.
Break-Even Calculator
Find breakeven point in units and revenue. Enter fixed costs, variable cost per unit and selling price. Includes contribution margin and safety margin analysis.
CPM Calculator
Calculate Cost Per Mille (CPM) for digital advertising campaigns. Find CPM from budget and impressions, or calculate total cost or reach from any two known values.
Conversion Rate Calculator
Calculate e-commerce or landing page conversion rate from total visitors and conversions. Find revenue impact of improving conversion rate by even 0.5%.
Invoice Calculator
Add line items, quantities and rates to generate a complete invoice total with tax, discount and grand total. Download as PDF or copy to clipboard.
CAGR Calculator
Calculate Compound Annual Growth Rate for any investment or business metric. Enter start value, end value and number of years to find CAGR percentage instantly.
Date & Time Calculators
Age, date difference, countdown, work hours and time zone tools
Age Calculator
Find your exact age in years, months, days, hours and even seconds. Also shows the day of the week you were born and how many days until your next birthday.
Date Difference Calculator
Find the number of days, weeks, months and years between any two dates. Exclude weekends or public holidays. Perfect for project timelines and contract durations.
Work Hours Calculator
Add up total work hours from multiple time entries. Track clock-in/clock-out times, deduct break time and calculate weekly total hours and pay.
Days Until Calculator
Count down days, hours and minutes until any future event — exam date, project deadline, vacation, product launch or anniversary. Live updating countdown.
Time Zone Calculator
Convert time between any two time zones globally. Find the equivalent time in New York, London, Tokyo, Dubai, Mumbai or any other city. Great for scheduling international calls.
Overtime Calculator
Calculate overtime pay from regular hourly rate and overtime hours. Supports 1.5x, 2x and custom multipliers. Shows breakdown of regular pay vs overtime pay.
Why These Are the Best Free Online Calculators
Built differently from NerdWallet, ClearTax, Bankbazaar and other calculator sites — here's what sets WebToolTrix apart.
Instant — No Server Round Trip
Every calculation happens entirely in your browser via JavaScript. There's no server request, no loading spinner, no wait. Enter a number, see the result immediately. Even complex amortisation schedules generate in milliseconds.
100% Private — Your Data Stays Local
Your salary, tax, loan amount and health data never leave your device. Unlike ClearTax or BankBazaar which track inputs for retargeting, WebToolTrix calculators have zero data collection. Everything is computed locally — private by design.
No Ads, No Upsells, No Limits
No daily calculation limits, no signup wall, no "premium" calculator versions. Most platforms lock advanced features (like amortisation tables or tax regime comparison) behind paid plans. Every WebToolTrix feature is fully accessible for free, forever.
India-Specific Tax Calculators
Our tax and salary calculators are built specifically for Indian users — with FY 2024-25 slabs, both old and new tax regime, EPF, gratuity, HRA and TDS rules pre-loaded. No need to manually look up rates or sections.
Works on Every Device
Responsive design that works perfectly on mobile, tablet and desktop. Calculate your EMI while at the bank, check your BMI at the gym, or plan your SIP at a coffee shop — all from your phone, with no app download needed.
45+ Calculators, One Place
Finance, tax, health, math, business and date calculators — all under one roof. No more bookmarking 10 different websites for different calculations. One bookmark covers every calculation you'll ever need.
Who Uses These Calculators?
From students to CAs, salaried professionals to business owners — here are the most common use cases.
Salaried Professionals
Calculate in-hand salary from CTC, check HRA exemption, plan tax savings under 80C and compare old vs new regime to decide which saves more tax this year.
Home Loan Buyers
Find the exact EMI before applying for a home loan. See how making a larger down payment or shorter tenure reduces your total interest outgo. Compare different banks/rates.
SIP Investors
Plan your wealth creation journey. See how ₹10,000/month invested in mutual funds for 20 years can grow to ₹1 crore+ at 12% CAGR. Reverse-calculate SIP needed for a goal.
Business Owners
Calculate GST on invoices, find profit margins on products, determine break-even point and track payroll. Perfect for freelancers and small businesses managing finances without an accountant.
Students & Educators
Solve percentage problems, fraction arithmetic, LCM/HCF for exams, or use the scientific calculator for physics and chemistry. Every step is shown with formula so you can learn, not just get answers.
Health-Conscious Users
Check BMI and find out which category you fall in. Calculate daily calorie needs for weight loss or muscle gain. Track ideal body weight and set a realistic water intake target.
Frequently Asked Questions About Our Calculators
Yes. All financial calculators use the latest RBI guidelines and standard formulas. Tax calculators are updated for FY 2024-25 with the latest Section 80C limits (₹1.5 lakh), new tax regime slabs announced in Budget 2024, and current EPF/TDS rules. GST slabs (5%, 12%, 18%, 28%) are inline with current GST Council rates. We update calculators each time the government announces changes.
Absolutely safe. Every WebToolTrix calculator runs entirely in your browser using JavaScript — no data is ever sent to our servers. Your salary, loan amount, tax details, health metrics and other inputs remain 100% on your device. We have no backend that receives calculation inputs, and we don't use cookies to track what you calculate. Unlike platforms like ClearTax or BankBazaar which collect this data for marketing, WebToolTrix is privacy-first by architecture.
EMI is calculated using the standard reducing balance formula: EMI = [P × r × (1+r)ⁿ] ÷ [(1+r)ⁿ − 1], where P = principal loan amount, r = monthly interest rate (annual rate ÷ 12 ÷ 100), and n = loan tenure in months. The calculator also generates a full amortisation schedule showing principal vs interest breakup for each month, and the total interest payable over the loan tenure.
It depends on your income and deductions. The new regime (default from FY 2024-25) has lower slab rates but removes most deductions. If your total deductions (80C + HRA + home loan interest + NPS + others) exceed approximately ₹3–3.75 lakh, the old regime typically saves more tax. Our Income Tax Calculator shows a side-by-side comparison of both regimes for your exact income, so you can make an informed choice without manual calculation.
BMI (Body Mass Index) = weight in kg ÷ (height in metres)². A BMI between 18.5 and 24.9 is considered normal weight. Below 18.5 is underweight, 25–29.9 is overweight, and 30+ is obese. However, BMI has limitations — it doesn't distinguish between muscle and fat mass. Athletes and highly muscular individuals may have a high BMI despite being healthy. Use our BMI Calculator along with the Ideal Weight and Body Fat calculators for a more complete picture.
At 12% annual returns (approximate long-term Nifty 50 CAGR), you need approximately ₹6,000/month for 30 years, or ₹15,000/month for 20 years, or ₹43,000/month for 10 years to reach ₹1 crore. You can use our SIP Calculator to enter your own return assumption and timeline to find the exact monthly SIP amount needed to reach any target corpus.
No. All 45+ calculators on WebToolTrix are completely free with no account, login or signup required. Open any calculator page and start calculating immediately. There is also no daily usage limit, no captcha verification and no email required. Bookmark the calculators you use frequently and access them instantly every time.
To add GST: GST Amount = Original Price × GST Rate ÷ 100. Total Price = Original Price + GST Amount. For example, ₹1,000 + 18% GST = ₹1,180. To remove GST from a GST-inclusive price (reverse calculate): Original Price = GST-inclusive Price × 100 ÷ (100 + GST Rate). So ₹1,180 ÷ 1.18 = ₹1,000. Our GST Calculator handles both directions — just select "Add GST" or "Remove GST" and enter the amount.
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