Free STEM Calculators & Tools

Essential calculators for math, chemistry, physics, and statistics. Built for students, by students.

Calculate your GPA instantly. Supports 4.0, 5.0, and weighted scales. Add courses and see your cumulative GPA in real-time.

Quadratic Formula Calculator

Solve quadratic equations instantly. Enter coefficients and get real or complex roots with step-by-step solutions.

Standard Deviation Calculator

Calculate standard deviation, variance, and mean for any data set. Supports both population and sample calculations.

Derivative Calculator

Calculate derivatives of mathematical functions. Supports polynomial, trigonometric, exponential, and logarithmic functions.

Molarity Calculator

Calculate molarity, moles, volume, or molar mass. Essential for chemistry lab calculations and solution preparation.

Ohm's Law Calculator

Calculate voltage, current, resistance, or power using Ohm's Law. Essential for electronics and physics problems.

Matrix Calculator

Perform matrix operations: addition, subtraction, multiplication, determinant, inverse, and transpose.

Calculate pH, pOH, [H+], and [OH-] concentrations. Convert between different acidity measurements.

Projectile Motion Calculator

Calculate projectile motion parameters: range, max height, time of flight, and velocity components.

Chemical Equation Balancer

Balance chemical equations automatically. Enter reactants and products to get balanced coefficients.

Vector Addition Calculator

Add vectors in 2D and 3D. Calculate resultant magnitude, direction, and unit vectors. Supports component and polar forms.

Inclined Plane Calculator

Calculate forces on inclined planes. Find normal force, parallel force, friction, and acceleration.

Friction Calculator

Calculate static and kinetic friction forces. Find friction coefficients and determine if objects will slide.

Kinematics Calculator

Solve kinematics problems with constant acceleration. Calculate displacement, velocity, acceleration, and time.

Center of Mass Calculator

Calculate center of mass for systems of particles. Find the balance point of multiple objects.

Torque Calculator

Calculate torque, lever arm, and rotational forces. Solve lever and rotational equilibrium problems.

Pendulum Calculator

Calculate pendulum period, frequency, and length. Supports simple and physical pendulums.

Power & Efficiency Calculator

Calculate mechanical power, work, and efficiency. Convert between watts, horsepower, and other units.

Terminal Velocity Calculator

Calculate terminal velocity for falling objects. Account for air resistance and drag coefficients.

Relative Velocity Calculator

Calculate relative velocity between moving objects. Solve reference frame problems in 2D and 3D.

Coulomb's Law Calculator

Calculate electric force between charges using Coulomb's Law. Find force, charge, or distance.

Resistor Calculator

Calculate equivalent resistance for series and parallel circuits. Supports multiple resistors and mixed configurations.

Capacitor Calculator

Calculate capacitor charge, discharge, and RC time constants. Analyze capacitor circuits and energy storage.

Doppler Effect Calculator

Calculate observed frequency changes due to motion. Supports sound and light Doppler shifts.

Snell's Law Calculator

Calculate refraction angles using Snell's Law. Find critical angles and total internal reflection.

Lens Equation Calculator

Calculate image distance, magnification, and focal length using the thin lens equation.

Ideal Gas Law Calculator

Calculate pressure, volume, temperature, or moles using PV=nRT. Supports multiple unit systems.

Thermal Expansion Calculator

Calculate linear, area, and volumetric thermal expansion. Find dimension changes with temperature.

Heat Transfer Calculator

Calculate heat transfer through conduction, convection, and radiation. Find thermal conductivity and heat flow.

Limit Calculator

Evaluate limits numerically. Approach values from left, right, or both sides. Identify indeterminate forms.

Riemann Sum Calculator

Approximate definite integrals using Riemann sums. Compare left, right, midpoint, and trapezoidal methods.

Determinant Calculator

Calculate matrix determinants with step-by-step cofactor expansion. Supports 2x2, 3x3, and larger matrices.

Systems of Equations Solver

Solve systems of linear equations. Supports 2x2 and 3x3 systems with step-by-step solutions.

Vector Operations Calculator

Calculate dot product, cross product, and angle between vectors. Find projections and unit vectors.

Binomial Probability Calculator

Calculate binomial probabilities and cumulative distributions. Find mean, variance, and standard deviation.

Normal Distribution Calculator

Calculate probabilities for normal distributions. Convert between z-scores and raw values.

Prime Factorization Calculator

Find prime factorization of any number. Calculate GCD, LCM, and check primality.

Modular Arithmetic Calculator

Perform modular arithmetic operations. Calculate modular inverse, exponentiation, and solve congruences.

Arc Length Calculator

Calculate arc length for circles and curves. Find sector area and central angle.

Molar Mass Calculator

Calculate molar mass from chemical formulas. Find percent composition and convert between mass and moles.

Stoichiometry Calculator

Solve stoichiometry problems using mole ratios. Find limiting reactants and calculate theoretical yield.

Dilution Calculator

Calculate dilution using M1V1=M2V2. Plan serial dilutions and stock solution preparations.

Poisson Distribution Calculator

Calculate Poisson probabilities for rare events. Find cumulative probabilities and distribution properties.

Chi-Square Test Calculator

Perform chi-square goodness of fit and independence tests. Calculate test statistics and p-values.

T-Test Calculator

Perform one-sample, two-sample, and paired t-tests. Calculate test statistics, p-values, and effect sizes.

Confidence Interval Calculator

Calculate confidence intervals for means and proportions. Find required sample sizes for desired precision.

Percentile Calculator

Calculate percentiles, percentile ranks, and quartiles. Get five-number summaries and identify outliers.

Linear Regression Calculator

Calculate linear regression line of best fit. Find slope, intercept, R-squared, and make predictions.

Correlation Calculator

Calculate Pearson correlation coefficient. Determine strength and direction of linear relationships.

Eigenvalue Calculator

Calculate eigenvalues and eigenvectors of 2x2 matrices. Visualize the transformation.

Spring-Mass Oscillator Calculator

Calculate simple harmonic motion. Find period, frequency, amplitude, and energy of spring-mass systems.

Wave Interference Simulator

Visualize constructive and destructive interference. Calculate path difference and intensity patterns.

Half-Life Calculator

Calculate radioactive decay and half-life. Find remaining amount, decay constant, and time elapsed.

Titration Calculator

Calculate titration endpoints and pH curves. Determine unknown concentrations from titration data.

Punnett Square Generator

Generate Punnett squares for monohybrid and dihybrid crosses. Calculate genotype and phenotype ratios.

Population Growth Simulator

Model exponential and logistic population growth. Visualize carrying capacity and growth curves.

Sorting Algorithm Visualizer

Computer Science

Visualize sorting algorithms step-by-step. Compare bubble sort, quick sort, merge sort, and more.

Moment of Inertia Calculator

Calculate moment of inertia for common shapes. Find rotational inertia for disks, spheres, rods, and more.

Electric Field Calculator

Calculate electric field strength and potential. Visualize field lines for point charges and distributions.

Magnetic Field Calculator

Calculate magnetic field strength for wires, solenoids, and loops. Apply Biot-Savart and Ampere's law.

Work-Energy Theorem Calculator

Calculate work, kinetic energy, and potential energy. Apply the work-energy theorem to mechanics problems.

Taylor Series Calculator

Generate Taylor and Maclaurin series expansions. Visualize polynomial approximations of functions.

Polar to Cartesian Converter

Convert between polar and Cartesian coordinates. Visualize points and curves in both systems.

Complex Number Calculator

Perform operations on complex numbers. Convert between rectangular and polar form, find roots and powers.

Electrochemistry Calculator

Calculate cell potential using Nernst equation. Find standard reduction potentials and Gibbs free energy.

Hardy-Weinberg Calculator

Calculate allele and genotype frequencies. Test populations for Hardy-Weinberg equilibrium.

Enzyme Kinetics Calculator

Calculate Michaelis-Menten kinetics. Find Km, Vmax, and analyze Lineweaver-Burk plots.

Angular Momentum Calculator

Calculate angular momentum for rotating objects. Apply conservation of angular momentum.

Buoyancy Calculator

Calculate buoyant force and determine if objects float or sink. Apply Archimedes principle.

Wave Speed Calculator

Calculate wave speed, frequency, and wavelength. Analyze standing waves and harmonics.

Rotational Kinetic Energy Calculator

Calculate rotational kinetic energy. Compare translational and rotational energy for rolling objects.

Logarithm Calculator

Calculate logarithms with any base. Convert between log, ln, and log10. Apply log properties.

Permutation & Combination Calculator

Calculate permutations, combinations, and factorials. Solve counting problems.

Partial Fractions Calculator

Decompose rational expressions into partial fractions. Essential for integration.

Buffer Solution Calculator

Calculate buffer pH using Henderson-Hasselbalch equation. Design buffer solutions.

Reaction Rate Calculator

Calculate reaction rates and rate constants. Analyze zero, first, and second order kinetics.

Osmotic Pressure Calculator

Calculate osmotic pressure using van't Hoff equation. Analyze colligative properties.

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