Loans: The EMI Calculator computes monthly installments using the reducing-balance formula and generates a full month-by-month amortization table. The Personal Loan Calculator lets you compare total interest cost across tenures, and the Loan Comparison Calculator puts two loan offers side by side so you can see which costs less over the full term. The Loan Prepayment Calculator shows exactly how much interest a lump-sum prepayment saves.

Investments: The SIP Calculator projects wealth from monthly mutual fund investments with a full wealth-gain breakdown. Compound Interest supports annual, semi-annual, quarterly, monthly, and daily compounding. PPF, FD, and RD calculators cover India's most popular fixed-return instruments. The Simple Interest Calculator handles straightforward interest problems in seconds.

Tax: The GST Calculator adds or removes GST at any slab (5%, 12%, 18%, 28%). The Income Tax Calculator estimates liability under both the old and new regimes for India FY2024-25. The Capital Gains Tax Calculator covers STCG and LTCG across equity, debt, property, and gold.

Retirement: The NPS Calculator, PPF Calculator, 401(k) Calculator, IRA Calculator, and Roth IRA Calculator help plan long-term corpus. The Retirement Withdrawal Calculator and FIRE Calculator answer how long your savings will last.

🔢 Math Calculators

The math section spans basic arithmetic, algebra, scientific functions, number theory, and a deep statistics library.

Basic: The Percentage Calculator handles three query types in one tool: find X% of a number, find what percent one number is of another, and back-calculate the original value. The Ratio Calculator simplifies ratios, finds missing values, and scales to a target total. The Fraction Calculator adds, subtracts, multiplies, and divides fractions with full step-by-step working.

Scientific: The Quadratic Equation Solver returns real and complex roots, the discriminant, vertex, and axis of symmetry. The Scientific Calculator covers trig, inverse trig, logarithms, powers, roots, and factorials. The Logarithm Calculator evaluates log in any base.

Algebra & Number Theory: The Linear Equation Solver handles single-variable and 2x2 systems using Cramer's rule. The LCM and GCF Calculator works with up to six numbers and shows prime factorization steps.

Statistics: The Descriptive Statistics Calculator is the flagship tool here, computing 25+ measures from any dataset including mean, median, mode, standard deviation, variance, quartiles, IQR, skewness, kurtosis, RMS, MAD, SEM, and a full frequency table. Other tools cover probability, normal distribution, correlation, z-score, and sample size.

❤️ Health Calculators

Every health calculator on CalculatorPod cites its source formula and uses clinically validated equations.

Body metrics: The BMI Calculator supports metric and imperial inputs and classifies results against WHO thresholds with a healthy weight range for your height. The BMR Calculator uses the Mifflin-St Jeor equation to find basal metabolic rate, then multiplies by activity level to give TDEE. The Body Fat Calculator uses the US Navy circumference method.

Nutrition: The Calorie Deficit Calculator translates a target weight-loss goal into a daily calorie deficit. The Protein Calculator sets daily intake based on body weight and activity. The Water Intake Calculator estimates daily hydration needs.

Fitness: The Calories Burned Calculator uses MET values for dozens of activities.

Women's health: The Pregnancy Due Date Calculator supports LMP, conception date, and ultrasound methods and shows trimester milestones. The Ovulation Calculator maps the fertile window across the next three cycles.

🔬 Physics Calculators

The physics section covers classical mechanics, kinematics, waves, optics, and electrostatics with 25+ tools.

Kinematics and motion: The Projectile Motion Calculator solves range, maximum height, time of flight, and final velocity components for any launch angle and speed. The Kinematic Equations Calculator accepts any three known values and solves for the remaining two across all five SUVAT equations. The Velocity Calculator handles speed, distance, and time with automatic unit conversions. The Acceleration Calculator uses the first kinematic equation to solve for acceleration, final velocity, or time.

Energy and forces: The Work, Energy and Power Calculator covers kinetic energy, potential energy, work done, and power in one tool. The Kinetic Energy Calculator uses KE = 0.5mv². The Force Calculator solves Newton's second law for force, mass, or acceleration. The Mechanical Advantage Calculator covers levers, pulleys, and inclined planes.

Electricity: The Ohm's Law Calculator solves for voltage, current, or resistance from any two known values. The AC Wattage Calculator computes real power (W), apparent power (VA), and reactive power (VAR). The Power Dissipation Calculator handles electrical power dissipation and thermal analysis.

Waves, optics, and acoustics: The Speed of Sound Calculator finds the speed of sound in any gas or solid at any temperature. The Speed of Sound in Solids Calculator returns longitudinal, shear, and extensional wave speeds. The Mirror Equation Calculator solves concave and convex mirror problems for image distance and magnification. The Aperture Area Calculator finds aperture area from diameter or f-number and focal length. The Speed of Light Calculator tells you how long light takes to travel any distance.

Engineering physics: The Mohr's Circle Calculator finds principal stresses, maximum shear stress, and principal plane angle. The Flywheel Energy Storage Calculator computes stored energy, moment of inertia, angular velocity, and tip speed. The Darcy-Weisbach Calculator solves pipe head loss, pressure drop, and flow rate. The BMEP Calculator finds brake mean effective pressure from torque or power and RPM for 4-stroke and 2-stroke engines. The Piston Speed Calculator gives mean piston speed from stroke and RPM. The Speeds and Feeds Calculator computes spindle RPM, feed rate, and metal removal rate for milling and turning operations.

Specialist physics: The Electron Speed Calculator returns electron velocity, Lorentz factor, and de Broglie wavelength from kinetic energy -- useful for quantum and particle physics contexts. The Ground Speed Calculator solves aviation ground speed from true airspeed, heading, wind speed, and wind direction. The Arrow Speed Calculator finds arrow speed from IBO rating, draw weight, draw length, and arrow weight.

⚗️ Chemistry Calculators

The chemistry section covers solution chemistry, stoichiometry, and thermodynamic properties with six core tools.

The Molecular Weight Calculator parses any chemical formula and returns the exact molecular weight. The Molarity Calculator converts between moles, volume, and concentration (mol/L). The Molality Calculator works in mol/kg and also computes boiling point elevation and freezing point depression. The Dilution Calculator uses C1V1 = C2V2 to find any of the four variables. The Stoichiometry Calculator converts between moles and mass in chemical reactions using stoichiometric ratios. The pH Calculator converts between pH and hydrogen ion concentration in both directions.

☢️ Nuclear Science Calculators

CalculatorPod has one of the most comprehensive public nuclear science calculator collections available, with 23 tools covering reactor physics, radiation safety, radiopharmaceuticals, and isotope analysis.

Radioactive decay: The Radioactive Decay Calculator finds remaining nuclei, activity, and fraction decayed at any time. The Half-Life Calculator converts between half-life, decay constant, and mean lifetime. The Bateman Equations Solver solves the full decay chain for 2- and 3-nuclide chains. The Secular and Transient Equilibrium Calculator classifies equilibrium type and finds equilibrium activity ratios.

Reactor physics: The Four-Factor Formula Calculator computes the infinite multiplication factor k∞ from reproduction factor, fast fission factor, resonance escape probability, and thermal utilization. The Neutron Multiplication k-effective Calculator extends this to finite reactors via one-group diffusion theory. The Moderator-to-Fuel Ratio Calculator finds the optimal moderator-to-fuel ratio for thermal reactors. The Neutron Flux and Reaction Rate Calculator computes reaction rate from flux and macroscopic cross-section. The Isotope Production and Burnup Calculator models isotope production activity and burnup fraction under steady neutron flux. The Nuclear Fuel Burnup Calculator expresses fuel depletion in MWd/tU.

Nuclear reactions and energy: The Nuclear Binding Energy Calculator finds binding energy and binding energy per nucleon from atomic mass data. The Nuclear Fission Energy Calculator computes energy released from mass defect using E = mc². The Q-Value Calculator finds the energy released or absorbed in any nuclear reaction from atomic masses. The Uranium Enrichment Calculator computes separative work units (SWU) required to produce enriched uranium from natural feed.

Radiation shielding and safety: The Gamma Ray Attenuation and Shielding Calculator computes transmitted intensity through any material and finds the shielding thickness needed to meet a dose target. The HVL and TVL Calculator derives half-value layer and tenth-value layer from the attenuation coefficient. The Point Source Dose Rate Calculator gives gamma dose rate at any distance from a point source. The Neutron Activation Analysis Calculator computes induced radioactivity to detect and quantify trace elements. The Neutron Shielding Calculator for Medical Cyclotrons finds the required concrete or polyethylene thickness to meet dose limits around medical cyclotron facilities. The Radiation Dose Calculator converts absorbed dose (Gy) to equivalent dose (Sv) using radiation weighting factors.

Medical physics and radiopharmaceuticals: The PET/SPECT Isotope Activity Planner calculates the required calibration activity for PET and SPECT imaging sessions given decay and scanner efficiency. The Radiopharmaceutical Dosimetry Calculator (MIRD) estimates organ absorbed dose from radiopharmaceuticals using the MIRD formalism.

🚀 Rocketry Calculators

CalculatorPod's rocketry section is the most specialized on the site, with 27 tools spanning propulsion, orbital mechanics, trajectory analysis, and structural design. Every calculator is built on published aerospace engineering equations.

Propulsion: The Tsiolkovsky Rocket Equation Calculator is the foundation -- it computes delta-v, mass ratio, and propellant mass for any rocket stage given Isp and dry/wet mass. The Specific Impulse Calculator derives Isp from thrust and mass flow rate. The De Laval Nozzle Designer sizes a convergent-divergent nozzle from chamber conditions, computing expansion ratio, exit Mach number, and Isp. The Chamber Pressure and Nozzle Throat Area Calculator finds throat area, exit area, and thrust coefficient from propellant properties. The Nozzle Exit Velocity Calculator gives exhaust velocity from pressure ratio or exit Mach number. The Combustion Temperature and Chamber Conditions Calculator estimates adiabatic flame temperature and computes characteristic velocity c*, throat temperature, and throat pressure. The Altitude Compensation Calculator shows how nozzle Isp varies with altitude as ambient pressure drops.

Multi-stage and mass analysis: The Multi-Stage Rocket Optimizer computes total delta-v and optimal stage sizing for 2- or 3-stage rockets given per-stage Isp and structural fractions. The Propellant Mass Fraction Calculator finds the fraction of total mass that is propellant and the resulting mass ratio. The Optimal Mass Ratio per Stage Calculator finds the ideal delta-v split across stages to maximize final velocity. The Stage Separation Delta-v Budget Calculator computes delta-v, mass ratio, and separation velocity stage by stage. The Thrust-to-Weight Ratio Calculator gives TWR at any point in the flight for any stage.

Trajectory and ascent: The Gravity Turn Trajectory Estimator simulates a gravity-turn ascent profile to estimate downrange distance and altitude at staging. The Drag Loss and Gravity Loss Budget Calculator estimates the velocity lost to aerodynamic drag and gravity during ascent. The Dynamic Pressure (Max-Q) Calculator computes dynamic pressure at any altitude using the ISA 1976 standard atmosphere model. The Re-entry Heating Calculator gives stagnation heat flux and equilibrium wall temperature for any re-entry trajectory.

Orbital mechanics: The Hohmann Transfer Orbit Calculator computes the two delta-v burns and transfer time needed to move between circular orbits. The Bi-elliptic Transfer Calculator handles three-burn transfers that are more efficient than Hohmann for large orbit changes. The Orbital Period and Velocity Calculator gives period and circular orbital speed at any altitude. The Escape Velocity Calculator computes escape velocity and first orbital velocity for any planet or moon. The Oberth Effect Calculator quantifies the extra delta-v efficiency gained by burning at periapsis. The Launch Window Calculator finds the departure phase angle for interplanetary Hohmann transfers. The Payload to Orbit Calculator estimates how much payload a rocket can deliver to a target orbit.

Structural and stability: The Center of Pressure vs Center of Gravity Stability Calculator computes the static stability margin in calibers -- the key metric for whether a rocket will fly straight. The Fin Flutter Velocity Calculator uses the NACA formula to find the airspeed at which fins will enter destructive flutter. The Max-Q Calculator identifies the point of maximum aerodynamic stress during ascent.

⚙️ Engineering Calculators

Electrical: The Wire Gauge Calculator looks up AWG specifications and calculates voltage drop for any circuit run length. The Transformer Ratio Calculator solves for secondary voltage, turns ratio, and impedance transformation. The Solar Panel Output Calculator estimates daily, monthly, and annual generation and helps size a system to a target load. The Voltage Divider Calculator finds output voltage from any two-resistor divider. The Resistor Color Code Calculator decodes 4-band and 5-band resistors to value and tolerance. The RMS Voltage Calculator converts peak voltage to RMS for sine, square, triangle, and sawtooth waveforms. The Resistor Wattage Calculator applies IPC-2221 derating to find the safe power rating. The Inductor Energy Storage Calculator uses E = 0.5LI². The Flyback Converter Calculator sizes turns ratio and magnetizing inductance for isolated SMPS designs. The MOSFET Threshold Voltage Calculator finds drain current from gate-source voltage and threshold voltage. The Photon Detection Efficiency Calculator computes SiPM PDE and signal-to-noise ratio for scintillation detector design.

Civil: The Beam Load Calculator solves reactions, bending moment diagrams, shear force, and deflection for simply-supported beams under point loads and uniformly distributed loads. The Pipe Flow Calculator uses the Darcy-Weisbach equation to find pressure drop or flow rate given pipe diameter, length, and roughness. The Concrete Mix Calculator finds the cement, sand, and aggregate quantities needed for M10 through M25 mix ratios. The Brick Calculator estimates exact brick count for any wall dimensions with mortar joint allowance. The Paint Coverage Calculator computes litres needed for any room accounting for doors, windows, and number of coats.

Mechanical: The Compression Spring Calculator, Extension Spring Calculator, and Torsion Spring Calculator all follow SMI and IS 7906 standards, computing spring rate, Wahl stress correction factor, solid height, and Goodman fatigue-life analysis across ten material grades. The Torque Calculator applies τ = F × r × sin(θ) with unit conversion across N⋅m, kgf⋅m, lbf⋅ft, and lbf⋅in.

Networking: The Bandwidth Calculator converts between file size, transfer time, and required connection speed. The Data Transfer Rate Calculator converts between all standard rate units and computes download/upload times. The Bits and Bytes Converter handles conversions from bits through terabytes in both decimal (SI) and binary (IEC) prefixes. The IP Subnet Calculator takes any IPv4 CIDR block and returns the network address, broadcast address, host range, and number of usable hosts.

📐 Geometry Calculators

2D shapes: Calculate area, perimeter, and diagonals for a Circle, Rectangle, Triangle, Square, and Trapezoid. The trapezoid calculator handles general, isosceles, and right-trapezoid variants with midsegment and diagonal outputs.

3D shapes: Find surface area and volume for a Sphere, Cylinder, Cube, and Cone. Each calculator shows the formula and a worked example.

Trigonometry: The Right Triangle Calculator solves all sides and angles from any two known values. The Law of Sines and Law of Cosines calculators handle oblique triangles.

📅 Date & Time Calculators

The Age Calculator returns exact age in years, months, and days from any date of birth and shows how many days until the next birthday. The Date Difference Calculator counts days, weeks, months, and years between two dates. The Business Days Calculator counts working days excluding weekends and public holidays. The Work Hours Calculator computes total hours worked across any shift or week. The Time Zone Converter supports 40+ zones with DST-aware conversion.

🛒 Everyday Calculators

The Discount Calculator finds the final price after a percentage or flat discount. The Tip Calculator splits a restaurant bill and calculates tip per person. The Fuel Cost Calculator estimates trip cost from distance, fuel efficiency, and price per litre. The Grade Calculator computes weighted averages from assignment scores, and the GPA Calculator converts letter grades to a GPA on a 4.0 scale.

Accuracy & Formulas

Every calculator on CalculatorPod shows its formula in full, with all variables defined. Formulas are sourced from standard references: IS and SMI standards for engineering, WHO guidelines for health, RBI and SEBI norms for Indian finance, and peer-reviewed statistical references for math. If you find an error in any result, use the feedback button on the calculator page to report it.