Science
Physics, chemistry and biology calculators and converters.
Free Shannon Diversity Index Calculator
Use our free Shannon Diversity Index Calculator online. Calculate the Shannon-Wiener diversity index (H), species evenness, and richness from your ecological survey data. Supports natural log, base 10, and base 2. Updated for 2026.
Free Car vs Bike Calculator
Use our free Car vs Bike Calculator online. Compare the environmental and financial benefits of cycling vs driving. Calculate CO2 reduction, money saved, and life expectancy gain from biking instead of driving. Updated for 2026.
Free Chemical Name Calculator
Use our free Chemical Name Calculator online. Are you having trouble with finding the name of your ionic compound? Our chemical name calculator can help you with that!. Updated for 2026.
Free Curie Constant Calculator
Use our free Curie Constant Calculator online to compute the Curie constant for paramagnetic materials. Enter atoms per unit cell, lattice constant, and magnetic moment for accurate results. Updated for 2026.
Free Car Center of Mass Calculator
Use our free car center of mass calculator online. Compute the longitudinal, altitudinal, and side position of your vehicle's center of gravity using precise weight and measurement inputs. Updated for 2026.
Free Compressibility Factor Calculator
Use our free Compressibility Factor Calculator online. Calculate the compressibility factor Z for real gases using pressure, volume, moles, and temperature with the formula Z = PV/nRT. Updated for 2026.
Free Cricket Chirp Thermometer
Use our free Cricket Chirp Thermometer online. Estimate temperature by counting cricket chirps per minute using Dolbear's law. Supports field cricket, snowy tree cricket, and katydid formulas. Updated for 2026.
Free Damping Ratio Calculator
Use our free Damping Ratio Calculator online. Determine if a system is underdamped, overdamped, or critically damped by computing the damping factor from oscillation parameters. Supports multiple units for damping coefficient, mass, and spring constant. Updated for 2026.
Free COVID-19 Waste Calculator
Use our free COVID-19 Waste Calculator online. Estimate your COVID-related plastic pollution from face masks, gloves, and hand sanitizers. Calculate your environmental footprint. Updated for 2026.
Free Cat Quality of Life Calculator
Use our free Cat Quality of Life Calculator online. Assess your cat's well-being using the HHHHHMM Scale across 7 criteria. Make informed hospice care decisions. Updated for 2026.
Free Daily Light Integral Calculator
Use our free Daily Light Integral (DLI) Calculator online. Calculate mol/m²/day from PPFD and light hours. Essential for greenhouse and horticulture lighting. Updated for 2026.
Free Diffusion Coefficient Calculator
Use our free Diffusion Coefficient Calculator online. The diffusion coefficient calculator quickly tells you the diffusion coefficient in Einstein-Smoluchowski diffusion processes. Updated for 2026.
Free Gravitational Force Calculator
Use our free Gravitational Force Calculator online. Compute the attractive force between any two masses using Newton's law of universal gravitation. Supports multiple mass, distance, and force units. Updated for 2026.
Free Enthalpy Calculator
Use our free Enthalpy Calculator online. Compute reaction enthalpy change (ΔH) using the formula ΔH = ΔU + p·ΔV or the standard enthalpy of formation method. Identify endothermic and exothermic reactions with multiple unit conversions. Updated for 2026.
Free Energy Density of Fields Calculator
Use our free Energy Density of Electric and Magnetic Fields calculator online. Compute the energy stored in electromagnetic fields using the standard physics formula. Updated for 2026.
Free Diffraction Grating Calculator
Use our free Diffraction Grating Calculator online. Calculate diffraction angles for orders 1 through 5 using wavelength, grating density, and incidence angle. Supports multiple length and angle units. Updated for 2026.
Free Ideal Gas Law Calculator
Use our free Ideal Gas Law Calculator online. Find pressure, volume, temperature, or number of moles of an ideal gas using the PV=nRT equation. Supports multiple unit conversions for pressure, volume, and temperature with real-time calculation. Updated for 2026.
Free Escape Velocity Calculator
Use our free Escape Velocity Calculator online. Calculate the speed required to leave any planet or celestial body's surface, plus the first cosmic orbital velocity. Updated for 2026.
Free Cat Age Calculator
Use our free Cat Age Calculator online. Convert cat years to human years and vice versa with our accurate formula. Know how old your cat really is. Updated for 2026.
Free Degree Of Unsaturation Calculator
Use our free Degree Of Unsaturation Calculator online. Use the degree of unsaturation calculator to determine the number of rings and pi bonds using the molecular formula of your organic structure. Updated for 2026.
Free Resistor Wattage Calculator
Use our free Resistor Wattage Calculator online. Calculate the power dissipated by a resistor from any two known values: resistance, current, voltage, or power. Updated for 2026.
Free Speed of Light Calculator
Use our free Speed of Light Calculator online. Compute how far light travels in a given time using the speed of light constant (299,792,458 m/s). Supports multiple speed units, time units, and distance output units. Updated for 2026.
Free Carrying Capacity Calculator
Use our free Carrying Capacity Calculator online. Calculate the maximum sustainable population size (K) using the logistic equation with population size, intrinsic growth rate, and change in population. Updated for 2026.
Free Radiation Pressure Calculator
Use our free Radiation Pressure calculator online. Calculate solar pressure exerted by starlight on surfaces or internal radiation pressure inside stars using standard physics equations. Updated for 2026.
Free Inductor Energy Calculator
Use our free Inductor Energy Calculator online. Calculate magnetic energy stored in an inductor using E = ½ × L × I² with inductance and current. Updated for 2026.
Free Centripetal Force Calculator
Use our free Centripetal Force Calculator online. Compute centripetal force and acceleration from mass, radius, and velocity with multiple unit conversions. Perfect for physics students and circular motion problems. Updated for 2026.
Free Sound Wavelength Calculator
Use our free Sound Wavelength Calculator online. Compute sound wave wavelength from frequency and speed of sound in air, water, steel, and other media. Supports multiple units for frequency, wavelength, and speed. Updated for 2026.
Free Dihybrid Cross Punnett Square Calculator
Use our free Dihybrid Cross Punnett Square Calculator online. Calculate genotype and phenotype probabilities for two traits. Includes 4x4 Punnett square and ratio analysis. Updated for 2026.
Free Solar Panel Wattage Calculator
Use our free Solar Panel Wattage Calculator online. Calculate the recommended solar panel wattage requirement based on your electricity consumption, solar hours, bill offset, and environmental factors. Updated for 2026.
Free Cube Density Calculator
Use our free Cube Density Calculator online. Calculate the density, mass, or volume of a cube from its side length, cube diagonal, face diagonal, or direct volume. Updated for 2026.
Free Torsional Constant Calculator
Use our free Torsional Constant Calculator online. Calculate the torsional constant K for circular, elliptical, square, rectangular, hollow, and I-section profiles subjected to torsion. Supports multiple units. Updated for 2026.
Free Net Ionic Equation Calculator
Use our free Net Ionic Equation Calculator online. Convert balanced molecular equations into complete ionic and net ionic forms by identifying spectator ions. Updated for 2026.
Free 12V Wire Size Calculator
Use our free 12V Wire Size Calculator online. Find the right wire gauge for your 12-volt automotive, marine, solar, or LED system. Supports copper and aluminum conductors with voltage drop and temperature correction. Updated for 2026.
Free Flow Rate Calculator
Use our free Flow Rate Calculator online. Compute volumetric and mass flow rate of fluids in pipes using diameter, velocity, and density. Supports multiple pipe shapes and unit conversions. Updated for 2026.
Free Tree Value Calculator
Use our free Tree Value Calculator online. Estimate the monetary value of a tree based on species, circumference, and height. Get instant tree appraisal. Updated for 2026.
Free Optical Density Calculator
Use our free Optical Density Calculator online. Compute optical density (OD), absorbance, and transmittance from incident and transmitted light intensities. Perfect for spectroscopy, microbiology, and optics. Updated for 2026.
Free Engine Displacement Calculator
Use our free Engine Displacement Calculator online. Calculate engine capacity in cc, cubic inches, or liters from bore diameter and stroke length. Supports reverse calculation for bore diameter. Updated for 2026.
Free Hydrogen Energy Levels Calculator
Use our free Hydrogen-Like Atom Energy Calculator online. Compute energy levels for hydrogen and hydrogen-like atoms using the Rydberg formula with atomic number Z and principal quantum number n. Updated for 2026.
Free LED Resistor Calculator
Use our free LED resistor calculator online. Calculate the required resistance and power dissipation for LEDs in series or parallel circuits with built-in LED color presets. Updated for 2026.
Free Car Crash Force Calculator
Use our free Car Crash Force Calculator online. Estimate impact force, g-force, and deceleration from speed, weight, and stopping distance. Updated for 2026.
Free Rydberg Equation Calculator
Use our free Rydberg Equation Calculator online. Calculate the wavelength, frequency, and photon energy of hydrogen-like atom spectral lines using the Rydberg formula. Supports custom atomic numbers. Updated for 2026.
Free Plastic Footprint Calculator
Use our free Plastic Footprint Calculator online. Calculate your annual plastic consumption, compare with averages, and discover ways to reduce your environmental impact. Updated for 2026.
Free Valve Flow Coefficient Calculator
Use our free Valve Flow Coefficient (Cv) calculator online. Calculate Cv or flow rate for liquids and gases with automatic unit conversions and formula breakdown. Updated for 2026.
Free Laser Spot Size Calculator
Use our free Laser Spot Size Calculator online. Calculate laser beam spot size and depth of focus from wavelength, beam diameter, focal length, and M² factor. Updated for 2026.
Free Cyclotron Frequency Calculator
Use our free Cyclotron Frequency Calculator online. Accurately determine the cyclotron frequency of a charged particle in a magnetic field using charge, field strength, and particle mass. Supports multiple unit systems. Updated for 2026.
Free Malus Law Calculator
Use our free Malus Law Calculator online. Calculate the intensity of light passing through a polarizer based on initial intensity and polarization angle. Supports multiple intensity and angle units with reverse calculation. Updated for 2026.
Free Time Dilation Calculator
Use our free Time Dilation Calculator online. Calculate how time changes at relativistic speeds using Einstein's special relativity formula. Displays dilated time and Lorentz factor. Updated for 2026.
Free Signal-to-Noise Ratio Calculator
Use our free signal-to-noise ratio calculator online. Compute SNR using simple ratio, power, voltage, or dB methods. Updated for 2026.
Free Magnetic Dipole Moment Calculator
Use our free Magnetic Dipole Moment Calculator online. Compute the magnetic dipole moment of a current-carrying loop or solenoid from current, radius, wire length, or area. Supports multiple units for current, distance, and area. Updated for 2026.
Free Vegan Footprint Calculator
Use our free Vegan Footprint Calculator online. Calculate how many animal lives, water, grain, forest land, and CO2 emissions you save by being vegan. Instant results with flexible units. Updated for 2026.
Free Hand Dryers vs Paper Towels Calculator
Use our free Hand Dryers vs Paper Towels calculator online. Compare the carbon footprint of electric hand dryers, paper towels, cotton roll towels, and drip drying. See how many trees your choice affects. Updated for 2026.
Free Ideal Gas Density Calculator
Use our free Ideal Gas Density Calculator online. Compute gas density from pressure, temperature, and molar mass using the ideal gas law ρ = PM/RT. Updated for 2026.
Free Passive Crossover Calculator
Use our free Crossover Calculator online. Design 2-way and 3-way passive speaker crossover networks with Butterworth and Linkwitz-Riley filters. Get capacitor and inductor values instantly. Updated for 2026.
Free Exoplanet Discovery Calculator
Use our free Exoplanet Discovery Calculator online. Explore how astronomers detect planets beyond our solar system using radial velocity, transit, and astrometry methods. Updated for 2026.
Free Critical Damping Calculator
Use our free Critical Damping Calculator online. Calculate the critical damping coefficient, natural circular frequency, stiffness, and mass of a damped oscillator. Enter any 2 values to automatically compute the other 2. Supports multiple unit systems. Updated for 2026.
Free Cell Dilution Calculator
Use our free Cell Dilution Calculator online. Calculate cell concentration, volume, or final dilution using the C1V1 = C2V2 formula for lab work. Updated for 2026.
Free DC Wire Size Calculator
Use our free DC Wire Size Calculator online. Determine the correct cable gauge for DC circuits based on voltage, current, distance, and wire temperature. Updated for 2026.
Free Series Inductors Calculator
Use our free Series Inductors Calculator online. Calculate the total equivalent inductance of inductors connected in series. Supports H, mH, μH, and nH units with dynamic inductor rows. Updated for 2026.
Free Rotational Kinetic Energy Calculator
Use our free Rotational Kinetic Energy Calculator online. Compute the energy of a rotating object from its moment of inertia and angular velocity. Supports multiple units. Updated for 2026.
Free Flywheel Energy Storage Calculator
Use our free Flywheel Energy Storage Calculator online. Compute stored energy, moment of inertia, and specific energy of a flywheel battery from mass, radius, geometric shape, and angular speed. Updated for 2026.
Free Transmission Calculator
Use our free Transmission Calculator online. Calculate vehicle speed from RPM, gear ratios, and tire diameter, or find the required RPM from speed. Updated for 2026.
Free Smartphone Projector Calculator
Use our free Smartphone Projector Calculator online. Build your own DIY smartphone projector with a shoebox and magnifying glass using the thin lens equation. Updated for 2026.
Free Cat BMI Calculator
Use our free Cat BMI Calculator online. Measure your cat's rib cage and leg length to calculate its Feline Body Mass Index (FBMI) and check if your cat is a healthy weight. Updated for 2026.
Free Mass to Density Calculator
Use our free Mass to Density Calculator online. Calculate density from mass and volume using the formula ρ = m / V, or switch modes to find mass or volume from the other two values. Supports metric, imperial, and US customary units. Updated for 2026.
Free Crude Protein Calculator
Use our free Crude Protein Calculator online. Use the crude protein calculator to determine an estimate of the protein content of a sample you are analyzing using the Kjeldahl method. Updated for 2026.
Free qPCR Efficiency Calculator
Use our free qPCR efficiency calculator online. Calculate amplification efficiency from standard curve slope. Enter the slope value to get efficiency percentage and R-squared value. Updated for 2026.
Free Flyback Converter Calculator
Use our free Flyback Converter Calculator online. Calculate duty cycle, peak currents, and inductances for the primary and secondary windings of your flyback converter circuit. Updated for 2026.
Free Pendulum Kinetic Energy Calculator
Use our free Pendulum Kinetic Energy Calculator online to compute the maximum kinetic energy, speed, period, and frequency of a pendulum from its length, mass, height, and gravity. Updated for 2026.
Free Simple Harmonic Motion Calculator
Use our free Simple Harmonic Motion Calculator online. Calculate displacement, velocity, and acceleration of an oscillating particle using SHM equations with multiple unit support. Updated for 2026.
Free Livestock Fence Calculator
Use our free livestock fence calculator online. Estimate fencing materials and costs for woven wire, barbed wire, and high-tensile fences. Calculate posts, wire, and total cost for your farm. Updated for 2026.
Free Power-to-Weight Ratio Calculator
Use our free Power-to-Weight Ratio Calculator online. Compare vehicle and engine performance by calculating power output per unit weight. Supports hp/lb, kW/kg, and multiple power and weight units. Accurate and instant results. Updated for 2026.
Free Tension Calculator
Use our free Tension Calculator online. Calculate tension force in ropes and strings for suspended objects, including two-rope angle systems. Supports multiple mass, gravity, and force units. Updated for 2026.
Free Feed Conversion Ratio (FCR) Calculator
Use our free Feed Conversion Ratio (FCR) Calculator online. Calculate how efficiently your livestock converts feed into body weight. Optimize feeding costs and animal growth. Updated for 2026.
Free Resistor Noise Calculator
Use our free Resistor Noise Calculator online. Calculate RMS noise voltage from resistance, temperature, and bandwidth. Supports multiple units and displays noise levels in dBu and dBV. Updated for 2026.
Free Lattice Energy Calculator
Use our free Lattice Energy Calculator online. Calculate the energy stored in ionic compounds using Kapustinskii, Born-Landé, Born-Mayer, or Hard Sphere methods. Fast and accurate. Updated for 2026.
Free Cephalexin for Dogs Dosage Calculator
Use our free Cephalexin for Dogs Dosage Calculator online. Calculate the safe antibiotic dose for your dog based on weight and drug type. Updated for 2026.
PPM to Molarity Calculator
Use our free PPM to Molarity Calculator online. Convert parts per million (ppm) to molarity (mol/L) and vice versa. Supports custom molar mass, solvent density, and bidirectional conversion with high precision. Updated for 2026.
Free Cell Doubling Time Calculator
Use our free Cell Doubling Time Calculator online. Calculate cell culture doubling time and growth rate from initial and final concentrations. Updated for 2026.
Free Enzyme Activity Calculator
Use our free Enzyme Activity Calculator online. Calculate enzyme mass needed for desired activity, based on stock activity and final volume. Updated for 2026.
Free Hoop Stress Calculator
Use our free Hoop Stress Calculator online to determine hoop (circumferential) stress, longitudinal stress, and dimensional changes in thin-walled cylindrical and spherical pressure vessels. Supports multiple units, joint efficiency, and real-time results. Updated for 2026.
Free Universe Expansion Calculator
Use our free Universe Expansion calculator online. Model cosmic evolution with the Friedmann equation, visualize the scale factor over time, and explore how dark energy, matter, and radiation shape the fate of the cosmos. Updated for 2026.
Free Gear Ratio Calculator
Use our free Gear Ratio Calculator online to find the gear ratio, output speed, and output torque of a two-gear system. Perfect for mechanical and engineering calculations. Updated for 2026.
Free Projectile Motion Calculator
Use our free Projectile Motion Calculator online. Calculate time of flight, range, maximum height, and velocity components of a projectile in parabolic motion. Updated for 2026.
Free Dipole Calculator
Use our free Dipole Calculator online. Compute antenna length, dipole leg length, wavelength, and more for half-wave dipole antennas. Supports all frequency and length units. Updated for 2026.
Free Spherical Capacitor Calculator
Use our free Spherical Capacitor Calculator online. Compute the capacitance of concentric spherical shells with dielectric. Supports multiple length and capacitance units. Updated for 2026.
Free Capacitor Energy Calculator
Use our free Capacitor Energy Calculator online. Calculate the energy stored in a capacitor and the electric charge accumulated on its plates. Supports multiple capacitance and voltage units. Fast and accurate. Updated for 2026.
Free Spring Calculator
Use our free Spring Calculator online. Calculate spring force, spring constant, or displacement using Hooke's Law with unit conversion. Updated for 2026.
Free Density Calculator
Use our free Density Calculator online. Calculate density, mass, or volume using the density formula d = m/v with support for multiple metric and imperial units. Updated for 2026.
Free Fermi Level Calculator
Use our free Fermi Level Calculator online. Compute Fermi energy, Fermi temperature, Fermi velocity, and Fermi wave number from electron density and material properties. Calculate Fermi-Dirac distribution probability. Updated for 2026.
Free Redshift Calculator
Use our free Redshift Calculator online. Calculate the redshift parameter z from emitted and observed wavelengths or frequencies using the standard redshift formula. Supports multiple units for precise astronomical calculations. Updated for 2026.
Free Conservation of Momentum Calculator
Use our free Conservation of Momentum Calculator online. Calculate velocities after elastic and inelastic collisions with multiple unit options. Updated for 2026.
Free Tramadol For Dogs Calculator
Use our free Tramadol For Dogs Calculator online. Calculate the safe tramadol dosage for your dog based on weight. Get lower and upper dose limits instantly. Updated for 2026.
Free Coefficient of Performance Calculator
Use our free Coefficient of Performance Calculator online. Calculate COP for refrigerators and heat pumps, including reversible (Carnot) and irreversible systems. Updated for 2026.
Free Voltage Divider Calculator
Use our free Voltage Divider Calculator online. Calculate output voltage for resistive (RR), capacitive (CC), inductive (LL), and mixed (RC, CR, RL, LR) divider circuits with automatic unit conversion. Updated for 2026.
Free Magnetic Field of a Straight Current-Carrying Wire Calculator
Use our free Magnetic Field of a Straight Current-Carrying Wire Calculator online. Compute the magnetic field strength around a long straight wire using current and distance from the wire. Updated for 2026.
Free Inverse Square Law Calculator
Use our free Inverse Square Law Calculator online. Calculate unknown intensity or distance using the inverse square law formula I₁r₁² = I₂r₂². Updated for 2026.
Free Prandtl-Meyer Expansion Calculator
Use our free Prandtl-Meyer expansion calculator online. Compute downstream Mach number, pressure, temperature, density, and Mach angles after an expansion wave. Updated for 2026.
Free Current Divider Calculator
Use our free Current Divider Calculator online. Calculate how current divides across branches in resistive, inductive, or capacitive parallel circuits. Supports multiple branches with automatic unit conversion. Updated for 2026.
Free Cat Benadryl Dosage Calculator
Use our free cat Benadryl dosage calculator online. Calculate the safe diphenhydramine dose for your cat based on weight in mg, tablets, and liquid form. Updated for 2026.
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