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Smart Calculators for Smarter Decisions
Free online calculators for finance, health, math, and everyday life. Fast, accurate, and easy to use — no signup required.
100% Free
All calculators are free to use. No hidden charges.
Instant Results
Get quick and accurate results in seconds.
Easy to Use
Simple interface designed for everyone.
Mobile Friendly
Works perfectly on all devices and screen sizes.
Services and featured tools
Practical tools and development services
Explore state-wise calculators, custom software prototyping and browser automation services from DevCalc.
Playwright and Python
Automation & Scraping
Automate browser tasks, business workflows, data extraction and repetitive pipelines with maintainable custom scripts.
Ready Reckoner 2026
Stamp Duty Calculator
Calculate property registration costs, circle rates and applicable women rebates across supported Indian states.
MH, KA, DL, UP and TN
RTO Road Tax Calculator
Check vehicle tax slabs, fuel-specific rates, EV policy waivers and BH Series registration guidance.
Interactive speed-math game
Calculator Tug of War — Beat the Bot
Test your mental arithmetic speed in a head-to-head tug of war against the DevCalc bot.
Vehicle Calculators(7)
Optimize your real-world transit economics. Instantly calculate car or bike mileage, trip fuel expenses, alternative CNG parameters, and daily vehicle running costs.
Vehicle
Car Affordability Calculator
Estimate an affordable on-road car budget from your take-home income, existing EMIs, down payment, interest rate, tenure, and monthly running cost.
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Vehicle
Tyre Size Calculator
Compare old and new tyre sizes, overall diameter, sidewall, circumference, ground-clearance change, and speedometer difference.
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Vehicle
IRCTC Ticket Cancellation Refund Calculator
Estimate the refund and cancellation deduction for confirmed, RAC, waitlisted, Tatkal, cancelled-train, and train-delay e-ticket scenarios.
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Vehicle
Mileage Calculator
Calculate your car or bike's real mileage in km/L, fuel cost per kilometre, and total trip expense from distance travelled, fuel used, and fuel price.
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Vehicle
Fuel Cost Calculator
Calculate daily, monthly, yearly fuel expenses and cost per kilometre for petrol, diesel, and CNG vehicles.
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Vehicle
Road Tax Calculator
Calculate road tax, RTO registration charges, and on-road price addition for your car or bike instantly. Get accurate state-wise motor vehicle tax slabs for petrol, diesel, CNG, and electric vehicles across all Indian states and union territories.
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Fun Calculators(8)
Lighthearted calculators for a quick smile. Check a playful love or friendship score, find your lucky number, or test zodiac compatibility — just for entertainment.
Fun
FLAMES Calculator
Play the classic FLAMES name game online and get a repeatable Friends, Love, Affection, Marriage, Enemies, or Siblings result.
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Fun
Pet Age Calculator
Convert a cat or dog's age into approximate human years and see a simple life-stage estimate, with dog size taken into account.
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Fun
Love Calculator
Enter two names to generate a repeatable love percentage and playful compatibility message. This private, name-based love test is free and intended for entertainment.
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Fun
Friendship Calculator
Check friendship compatibility between two people using their names. Discover your friendship percentage, bond strength, and compatibility level instantly with our free Friendship Calculator — a fun way to celebrate any friendship.
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Fun
Crush Calculator
Check your crush compatibility percentage instantly with our free Crush Calculator — just enter two names to discover your crush match score, relationship potential, and compatibility level. Fun, fast, and free to use anytime, anywhere, with no sign-up required!
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Fun
Lucky Number Calculator
Calculate your lucky number using your date of birth. Discover your numerology number, personality traits, strengths, and life path insights instantly with our free Lucky Number Calculator.
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Finance Calculators(20)
Simplify your financial planning with accurate tools for calculating loan EMIs, mutual fund compound interest, wealth accumulation, and annual tax returns under latest regimes.
Finance
Home Loan Prepayment Calculator
Compare your current home-loan schedule with a lump-sum or recurring monthly prepayment to estimate interest and tenure saved.
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Finance
GST Calculator
Calculate Indian Goods and Services Tax (GST) instantly for both inclusive and exclusive amounts. Breakdown base price, CGST, SGST, IGST, and total invoice value across all standard GST slabs (5%, 12%, 18%, 28%).
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Finance
EMI Calculator
Calculate monthly EMI, total interest payable, and total loan repayment amount instantly. Plan home loans, car loans, and personal loans with accurate amortization breakdowns.
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Finance
SIP Calculator
A free SIP Calculator built to help you plan smarter mutual fund investments. Just enter your monthly investment amount, expected rate of return, and investment duration to instantly see your total invested amount, wealth gained, and projected maturity value — making it easier to plan systematic investments and work toward long-term financial goals like retirement, education, or wealth creation.
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Finance
FD Calculator
Calculate Fixed Deposit (FD) maturity amount, cumulative interest earned, and quarterly compounding returns. Compare interest rates across leading Indian public, private, and small finance banks with DICGC insurance and tax deduction guidance.
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Finance
Simple Interest Calculator
Calculate simple interest, interest earned, and total maturity amount instantly.
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Construction Calculators(11)
Plan structural raw material logistics with industrial precision. Calculate total brick counts, mortar volumes, concrete mixing frameworks, and structural masonry budgets.
Construction
Water Tank Capacity Calculator
Calculate rectangular or cylindrical water tank capacity in litres, cubic metres, and US gallons from internal dimensions.
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Construction
AAC Block Calculator
Estimate AAC blocks, wall volume, wastage, adhesive bags, and material cost after deducting door and window openings.
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Construction
Staircase Calculator
Calculate staircase steps, riser height, tread depth, total run, stair angle, and stringer length from your floor-to-floor height and available space.
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Construction
House Construction Cost Calculator
Estimate house construction cost in India from built-up area, city tier, quality, and floors. Review per-square-foot rates plus material and labour shares.
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Construction
Brick Calculator
Estimate bricks or blocks for a wall from its length, height, and thickness, including joint volume, wastage, unit price, and material cost.
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Construction
Cement Calculator
Estimate 50 kg cement bags, cement weight, volume, and cost for slabs, foundations, beams, columns, and floors using project dimensions and concrete grade.
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Utility Calculators(8)
Track day-to-day timeline milestones cleanly. Compute precise durations between dates, track exact chronological age indexes, and run personal record calculations.
Utility
Age Calculator
Calculate your exact age instantly from your date of birth. Find your age in years, months, weeks, days, hours, minutes, and seconds using our free online Age Calculator.
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Utility
Date Calculator
Calculate the exact difference between two dates in years, months, weeks, days, hours, and minutes. Use our free Date Calculator for date duration, countdowns, and date interval calculations.
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Utility
Unit Converter
Convert common length, weight, and temperature units with clear, instant results.
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Utility
Password Generator
Create customizable example passwords with uppercase letters, lowercase letters, numbers, and symbols directly in your browser.
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Utility
Random Number Generator
Generate a pseudo-random integer between an inclusive minimum and maximum for casual games, samples, and everyday decisions.
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Utility
QR Code Generator
A free, easy-to-use QR Code Generator for websites, text, emails, phone numbers, WiFi networks, and more. Create a custom QR code in seconds, preview it instantly, and download it in high resolution — perfect for business cards, posters, menus, or sharing information quickly without typing.
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Health Calculators(18)
Monitor your vital body composition and biometric baselines. Calculate exact BMI scores, track healthy prenatal gestational weight gain curves, and map peak ovulation windows.
Health
BMI Calculator
Calculate your Body Mass Index (BMI) instantly using your height and weight. Determine whether you are underweight, normal weight, overweight, or obese across both International WHO and Asian-specific ICMR diagnostic standards.
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Health
BMR Calculator
Calculate your Basal Metabolic Rate (BMR) using the Mifflin-St Jeor Equation. Estimate the number of calories your body burns at rest and determine your daily calorie requirements based on activity level.
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Health
Calorie Calculator
Calculate your Total Daily Energy Expenditure (TDEE) and daily calorie targets for sustainable fat loss, muscle gain, or weight maintenance based on the clinical Mifflin-St Jeor equation and physical activity coefficients.
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Health
Body Fat Calculator
Calculate your body fat percentage using the U.S. Navy Method. Estimate body fat levels for men and women and determine your body fat category instantly.
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Health
Ideal Body Weight Calculator
Compare ideal body weight reference estimates by height and sex using the Devine, Hamwi, Robinson, and Miller formulas.
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Health
Water Intake Calculator
Calculate your recommended daily fluid intake based on body weight, physical exertion levels, and environmental climate factors following EFSA and National Academies hydration guidelines.
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Math Calculators(14)
Solve advanced linear algebra grids and equation systems effortlessly. Run matrices additions, dot-product multiplications, matrix inversions, and scalar determinants.
Math
Percentage Calculator
Calculate percentages, percentage increases, percentage decreases, and proportional fractions instantly. Multi-mode calculator for finding 'What is X% of Y', 'X is what % of Y', and percent change.
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Math
Fraction Calculator
Calculate fractions instantly. Add, subtract, multiply, divide, simplify fractions, convert fractions to decimals, and solve mixed fraction problems online.
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Math
Mean Median Mode Calculator
Calculate mean, median, and mode instantly from a set of numbers. Use our free Mean Median Mode Calculator to analyze data, statistics, averages, and distributions quickly and accurately.
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Math
Ratio Calculator
Calculate, simplify, compare, and solve ratios instantly. Use our free Ratio Calculator to find equivalent ratios, ratio values, proportions, and ratio relationships quickly and accurately.
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Math
Standard Deviation Calculator
Calculate standard deviation, variance, mean, and data spread instantly. Use our free Standard Deviation Calculator for statistics, research, education, and data analysis.
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Math
Probability Calculator
Calculate the probability of an event from favorable and total equally likely outcomes, then view the result as a fraction, decimal, percentage, and odds.
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Education Calculators(9)
Stay on top of your academic scores. Convert marks to percentages, work out GPA and CGPA, find the grade you still need in a final exam, and plan your study hours.
Education
GPA Calculator
Calculate Semester Grade Point Average (SGPA), Cumulative GPA (CGPA), and percentage conversions using the University Grants Commission (UGC) 10-point Choice Based Credit System (CBCS) and US 4.0 scale.
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Education
Attendance Calculator
Calculate your current class attendance percentage, determine the exact number of consecutive lectures needed to reach mandatory 75% or 80% criteria, and calculate how many classes can be safely skipped.
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Education
CGPA Calculator
Calculate your CGPA (Cumulative Grade Point Average) and convert it into percentage instantly. Add grades and credits for multiple subjects to get accurate results.
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Education
Average Calculator
Need to find the average of a list of numbers? This free calculator instantly works out the mean, total, count, minimum, and maximum values — and shows you the full step-by-step calculation so you understand exactly how the result was reached.
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Education
Scientific Calculator
Free online Scientific Calculator (Sci Calculator / SC Calculator) for advanced mathematical calculations including trigonometry, logarithms, powers, roots, factorials, exponents, and engineering calculations.
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Education
Final Grade Calculator
Calculate the score you need on your final exam to achieve your desired course grade. Quickly determine required marks using your current grade, final exam weight, and target grade.
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Developer Tools Calculators(11)
Accelerate your programming workflow. Validate or minify raw JSON syntax logs, generate secure random UUID v4 strings, and encode percent-escaped URLs safely.
Developer Tools
JSON Formatter
Fix, format, beautify, validate, and minify JSON data instantly with one click. Free online JSON Formatter and JSON Beautifier for developers.
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Developer Tools
Website Carbon Footprint Calculator
Estimate a web page's transfer weight, HTTP requests and CO₂e per visit, check whether its hosting is recognised as green, and project monthly or annual emissions.
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Developer Tools
Android UI Inspector
Connect an Android phone through USB, capture its current screen and UI hierarchy, and copy Appium, UIAutomator2, XPath, or ADB tap selectors.
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Developer Tools
UUID Generator
Generate UUID v4 identifiers instantly. Create single or multiple unique UUIDs for development, databases, APIs, testing, and distributed architecture.
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Developer Tools
Base64 Encoder Decoder
Encode text or binary data to Base64 strings and decode Base64 back to its original format instantly. Free, secure, client-side online developer utility.
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Developer Tools
URL Encoder Decoder
Encode and decode URLs instantly. Convert special characters into percent-encoded, URL-safe formats or parse encoded strings back into human-readable text.
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Other Calculators(13)
Handy everyday helpers that don't fit a single box. Generate passwords and QR codes, convert units and timestamps, and run quick one-off calculations in seconds.
Other
Gold Making Charges Calculator
Work out the real price of gold jewellery before you walk into a store. Enter the gold rate, weight, purity, making charge percentage (or flat rate), hallmarking fee, and GST — and see exactly how each rupee adds up to your final bill.
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Other
Gold Price Calculator
Find out what your gold is worth in seconds. Enter today's gold rate, weight, and purity — in grams, kilograms, tola, or ounces — and get an instant, accurate value for 24K, 22K, 18K, and 14K gold.
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Other
Silver Price Calculator
Find out what your silver is worth in seconds. Enter today's silver rate, weight, and purity — in grams, kilograms, tola, or ounces — and get an instant, accurate value for fine, sterling, and other common silver purities.
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Other
Gold GST Calculator
Calculate 3% GST on the total transaction value of gold jewellery, including itemised making charges and an optional hallmarking fee.
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Other
Wedding Budget Calculator
Estimate your total wedding cost in India by guest count, city tier, and style, with a category-wise breakdown covering venue, catering, décor, photography, attire, and more.
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Other
Party Budget Calculator
Estimate the total cost of a birthday, anniversary, or house party in India by guest count, venue type, and catering style, with a clear category-wise cost breakdown.
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Calculator Categories
Browse calculators by category and find the right tool for your needs.
Finance
20 Calculators
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14 Calculators
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8 Calculators
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9 Calculators
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8 Calculators
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