🔬

Science Calculators

Physics, chemistry, conversions, and more. 26 free calculators — no sign-up required.

Fraction Calculator

Add, subtract, multiply and divide fractions and mixed numbers, convert fractions to whole numbers, and simplify fractions — with full step-by-step solutions.

Natural Frequency Calculator

Calculate the natural frequency of spring-mass systems, cantilever beams, simply supported beams, and pendulums. Returns frequency in Hz, angular frequency in rad/s, and period in seconds.

Mean Kinetic Temperature Calculator

Calculate Mean Kinetic Temperature (MKT) from a series of temperature readings using the Arrhenius equation — the pharmaceutical cold chain standard per USP <1079> and ICH Q1A(R2). Supports Celsius and Fahrenheit input with preset activation energies.

Functional Residual Capacity Calculator

Calculate predicted Functional Residual Capacity (FRC), FVC, FEV1, FEF 25-75, and Total Lung Capacity from age, sex, height, and ethnicity using Quanjer 1993 ECCS reference equations. Enter measured spirometry values to see percentage of predicted.

Wavelength Frequency Calculator

Convert between wavelength, frequency, and wave speed for any type of wave using the wave equation v = fλ.

Refractive Index Calculator

Calculate the refractive index of a material from the speed of light, or use Snell's law to find the angle of refraction between two media.

Beer-Lambert Law Calculator

Calculate absorbance, transmittance, molar absorptivity, concentration, or path length using the Beer-Lambert law A = εcl.

Bragg Diffraction Calculator

Calculate interplanar spacing, diffraction angle, or X-ray wavelength using Bragg's law nλ = 2d sinθ, with full step-by-step working.

Planck Blackbody Calculator

Calculate blackbody radiation spectral radiance, peak wavelength (Wien's law), and total power (Stefan-Boltzmann law) for any temperature.

Debye Length Calculator

Calculate the Debye screening length for plasmas and electrolyte solutions. Covers semiconductor processing, battery design, colloidal stability, and biosensor applications.

Kinetic Energy Calculator for Students

Calculate kinetic energy from mass and velocity. Understanding motion energy with step-by-step explanations.

Mole to Grams Calculator

Convert moles to grams using molar mass. Essential chemistry homework calculator with step-by-step explanations.

Potential Energy Calculator for Students

Calculate gravitational and elastic potential energy. Understand stored energy with examples and step-by-step explanations.

Work Energy Theorem Calculator

Calculate work, kinetic energy change, and force using the work-energy theorem. Physics calculation tool.

Sign Magnitude Calculator

Convert between decimal and sign-magnitude binary representation. Compare sign-magnitude, two's complement, one's complement, and unsigned binary side-by-side. Understand why sign-magnitude is intuitive but rarely used in modern CPUs.

Parts per Million Calculator

Calculate parts per million from solute mass, sample mass, volume, and density with ppm, ppb, and percent breakdowns.

Sky Background Electron Rate Calculator

Estimate sky background electron rate from sky brightness, photometric zero point, pixel scale, aperture pixels, and exposure time.

Angle of Impact Calculation

Calculate impact angle from stain width and length using the arcsine width-over-length method.

Air to Fuel Ratio Calculator

Calculate air-to-fuel ratio, lambda, and equivalence ratio from air mass, fuel mass, and stoichiometric fuel type.

Ag PhD Crop Removal Calculator

Estimate crop nutrient removal from yield and nutrient removal coefficients for N, P2O5, K2O, and sulfur.

Bentonite Clay Pond Calculator

Estimate bentonite clay needed for pond sealing from area, application rate, and safety allowance.

Acres per Hour Calculator

Calculate acres per hour from implement width, travel speed, and field efficiency.

Calculate the Solubility of Potassium Bromide at 23

Estimate potassium bromide solubility at 23°C using linear interpolation between nearby solubility data points.

Calculate the Heat of Reaction in Trial 1

Calculate heat of reaction for Trial 1 using solution mass, specific heat, temperature change, calorimeter constant, and moles reacted.

How to Calculate Superheat

Calculate HVAC superheat from measured suction line temperature and saturation temperature.

Air Flow Through an Orifice Calculator

Estimate air flow through an orifice from diameter, pressure drop, air density, and discharge coefficient.