5,200+ Free Online Calculators & Unit Converters | World's Online Calculator Store

Welcome to the world's most extensive online calculator store and computational hub by Subhankar Patnaik. Instant, accurate calculations for Finance, Health, Mathematics, Physics, and Metric Converters.

Financial & Investment Calculators

SIP Calculator (Systematic Investment Plan): Compute wealth accumulated via mutual fund monthly SIPs, compounding returns, and capital appreciation.
CAGR Calculator (Compound Annual Growth Rate): Calculate the geometric annualized return rate of stocks, real estate, and portfolio assets.
XIRR Calculator (Extended Internal Rate of Return): Calculate annualized yields for irregular investment cash flows, purchases, and dividend redemptions.
EMI & Loan Amortization Calculator: Calculate monthly loan repayments, total interest payable, and amortization schedules for home, auto, and personal loans.
Lumpsum Investment Calculator: Compound interest calculator for one-time wealth investments.
SWP Calculator (Systematic Withdrawal Plan): Retirement cashflow and annuity withdrawal planning with remaining corpus estimation.
PPF Calculator (Public Provident Fund): Government-backed tax-free savings growth with annual compounding.
Fixed Deposit (FD) & RD Calculator: Bank deposit interest calculator with quarterly and annual compounding payout options.
Inflation & Purchasing Power Calculator: Future cost calculator adjusting for average CPI inflation rates.
GST & Sales Tax Calculator: Instant gross, net, and tax split computation with standard rate brackets.

Health, Fitness & Medical Calculators

BMI Calculator (Body Mass Index): WHO and Asian BMI classification with healthy weight range targets.
BMR Calculator (Basal Metabolic Rate): Mifflin-St Jeor & Harris-Benedict formulas for resting daily calorie expenditure.
Body Fat Percentage Calculator: US Navy clinical circumference method for men and women.
Daily Calorie Intake Calculator: Calorie deficit and surplus calculator for weight loss, maintenance, and muscle gain.
Daily Water Intake Hydration Calculator: Personalized fluid requirement calculation adjusted for body weight and activity level.
Heart Rate Training Zones Calculator: Karvonen formula for fat burn, aerobic, and peak anaerobic cardio zones.
Pregnancy Due Date & Milestone Calculator: Naegele's rule pregnancy milestone tracker from Last Menstrual Period (LMP).

Math, Algebra & Scientific Computation

Scientific Calculator Online: Advanced algebra, trigonometry (sin, cos, tan), logarithmic functions (ln, log10), exponents, and factorial operations.
Standard Digital Tape Calculator: Basic arithmetic with running tape history and memory registers (M+, M-, MR, MC).
Percentage & Percentage Change Calculator: Find percentage increase, decrease, difference, and markups.
Quadratic Equation Solver: Real and complex roots solver with discriminant analysis.
Fraction & Ratio Solver: Simplify, add, subtract, multiply, and divide vulgar and mixed fractions.
Base Converter & Binary Calculator: Decimal, Binary, Hexadecimal, and Octal radix numeral system conversion.
GCD & LCM Finder: Euclidean algorithm greatest common divisor and least common multiple calculator.
Combinatorics (Permutations & Combinations): nPr and nCr factorial solver.

Physics & Engineering Calculators

Ohm's Law & Electrical Power Calculator: Calculate Voltage (V), Current (I), Resistance (R), and Power (W).
Kinetic & Potential Energy Calculator: Classical Newtonian mechanics and work energy theorem calculations.
Projectile Motion Calculator: Trajectory, apex height, flight time, and horizontal range calculations.
Density, Mass & Volume Calculator: Matter density and specific gravity computations.

Unit Converters & Everyday Utilities

Live Currency Converter: Real-time foreign exchange (Forex) rates for USD, EUR, INR, GBP, JPY, CAD, AUD, and 150+ world fiat currencies.
Length & Distance Converter: Meters, Kilometers, Miles, Feet, Inches, Yards, Centimeters, Millimeters, and Light Years.
Weight & Mass Converter: Kilograms, Grams, Pounds (lbs), Ounces (oz), Metric Tons, Stones, and Carats.
Speed & Velocity Converter: km/h, mph, m/s, Knots, and Mach number.
Volume & Capacity Converter: Liters, Milliliters, Gallons (US/UK), Cubic Meters, Cups, Fluid Ounces.
Temperature Converter: Celsius, Fahrenheit, and Kelvin temperature scales.
Fuel Economy & Trip Cost Calculator: Liters per 100km, MPG (US/UK), and total trip fuel expense.
Data Transfer & Download Time Calculator: File download duration estimates across various broadband bandwidth speeds.
Electricity Cost & Power Consumption Calculator: Kilowatt-hour (kWh) appliance energy usage and utility bill cost estimation.