Beer-Lambert Law Calculator - Solve the Beer-Lambert law A = εlc for any unknown — absorbance, molar absorptivity, path length, or concentration. This spectrophotometry calculator converts absorbance to percent transmittance, draws an animated cuvette showing how light is attenuated through your sample, plots the A-versus-concentration calibration line, and flags whether your reading sits in the reliable measurement range. Supports M / mM / µM / nM concentration units and cm / mm path lengths with a full step-by-step breakdown.

Boiling Point Elevation Calculator - Calculate boiling point elevation (ΔTb) from molality and the ebullioscopic constant using the colligative formula ΔTb = i × Kb × m. Includes a built-in solvent library (water, ethanol, benzene, acetic acid and more) with real Kb and boiling-point data, a van't Hoff factor for ionic solutes, an animated thermometer showing how far the boiling point rises, a "salt-to-boil" kitchen reality check that debunks the salted-pasta-water myth, an optional molality-from-mass helper, and a full step-by-step breakdown. Works on mobile and desktop.

Chemical Equation Balancer - Automatically balance chemical reaction equations by finding the correct stoichiometric coefficients for reactants and products. Enter any unbalanced equation and get instant results with detailed explanations and atom conservation verification. New

Corrected Calcium Calculator - Calculate corrected calcium level adjusted for albumin with multiple formulas (Payne, modified), clinical interpretation, visual calcium distribution diagram, and step-by-step calculation breakdown.

Corrected Sodium Calculator - Calculate corrected sodium for hyperglycemia using Katz and Hillier formulas. Includes clinical interpretation, step-by-step calculations, and severity assessment for DKA and HHS management.

Dilution Calculator - Calculate solution dilutions using the M₁V₁ = M₂V₂ equation. Find the stock volume, final volume, or resulting concentration when preparing diluted solutions in the lab. New

Electron Configuration Calculator - Find the electron configuration of any element or ion. This calculator generates the full and noble-gas (condensed) electron configuration, an interactive orbital box diagram with Hund's-rule spin arrows, the Aufbau diagonal-filling chart, and tells you the number of unpaired electrons, whether the species is paramagnetic or diamagnetic, the valence electrons, and the quantum numbers of the last electron. It correctly handles the d- and f-block exceptions such as chromium, copper, and silver that most calculators get wrong.

Empirical Formula Calculator - Determine the empirical formula of a chemical compound from element mass percentages or experimental mass data. Optionally compute the molecular formula using molar mass. New

Freezing Point Depression Calculator - Calculate freezing point depression (ΔTf) from molality and the cryoscopic constant using the colligative formula ΔTf = i · Kf · m. Includes a built-in solvent library (water, benzene, cyclohexane, camphor and more) with real Kf and freezing-point data, a van't Hoff factor for ionic solutes, an animated thermometer showing how far the freezing point drops, an optional molality-from-mass helper, and a full step-by-step breakdown. Works on mobile and desktop.

Henderson-Hasselbalch Calculator - Calculate buffer pH from pKa and the conjugate base / weak acid ratio using the Henderson-Hasselbalch equation. This solver works three ways: find the pH of a buffer, find the exact base-to-acid ratio (and recipe concentrations) needed to hit a target pH, or back-calculate the pKa from a measured pH. See your buffer on an interactive 0-14 pH scale with its effective buffering window, a base-vs-acid balance, a buffer-capacity gauge, common buffer presets, and a full step-by-step breakdown.

Interactive Periodic Table - Explore a searchable, interactive periodic table of all 118 chemical elements. Recolor the whole table by any property (electronegativity, atomic radius, ionization energy, density, melting point or discovery year) to see periodic trends as a live heatmap, filter by element category, and click any element for its key data, electron configuration and an animated Bohr atomic model. Mobile-friendly, no sign-up, completely free.

Limiting Reactant Calculator - Enter any balanced chemical equation and the amounts of each reactant (in grams or moles) to instantly find the limiting reactant, the excess reactant left over, and the theoretical yield of every product. Molar masses are parsed automatically, and a visual reaction-extent chart shows exactly which reactant runs out first, with an optional percent-yield calculation and a full step-by-step worked solution.

Molality Calculator - Calculate molality (m) from the moles of solute and the mass of solvent, or enter the solute in grams with its molar mass and let the tool find the moles for you. See the result on an animated solution beaker, then watch how molality drives the real-world colligative effects — freezing-point depression and boiling-point elevation — on a live temperature-range bar for water and other common solvents. Includes a step-by-step formula breakdown, a molality-versus-molarity explainer, and full unit handling (mg, g, kg).

Molar Mass Calculator - Calculate the molar mass of any chemical compound with detailed element breakdown, percentage composition, step-by-step calculations, and interactive periodic table.

Molarity Calculator - Calculate molarity (M), mass of solute, or volume of solution with step-by-step formulas. Features common compound database, unit conversion, and dilution calculator. Featured

Mole/Gram/Particle Converter - Convert between moles, grams, and number of particles (atoms, molecules, ions) using molar mass and Avogadro's number. Get step-by-step conversion solutions with detailed formulas. New

Nernst Equation Calculator - Calculate the cell potential of an electrochemical (galvanic) cell under non-standard conditions using the Nernst equation E = E° − (RT/nF)·ln Q. Enter the standard cell potential, the number of electrons transferred, the temperature, and the reaction quotient Q (or product and reactant concentrations) to get the actual voltage, the Gibbs free energy ΔG, the equilibrium constant K, and a spontaneity verdict. Includes an interactive Nernst line chart of E versus log Q, an animated galvanic-cell diagram, and a full step-by-step breakdown. Supports any temperature.

Normality Calculator - Calculate the normality (N) of a solution from the number of equivalents and the volume, or work it out straight from the grams of a compound using its molar mass and n-factor. The tool also converts between normality and molarity through the equivalence factor (N = M x n) and shows the relationship on an animated equivalence bridge, so you can see at a glance how reactive equivalents compare with moles. Includes one-click n-factor presets for common acids, bases and salts, a step-by-step formula breakdown, equivalent-weight output and full volume handling (L and mL).

Osmotic Pressure Calculator - Calculate osmotic pressure (π) of a solution with the colligative formula π = i · M · R · T. Enter molarity directly or derive it from mass, molar mass and volume, pick the van't Hoff factor for ionic solutes, and set the temperature in °C, K or °F. See the pressure in atm, kPa, mmHg, bar and psi at once, an animated osmometer tube showing the column height a solution would climb, a tonicity verdict (hypotonic / isotonic / hypertonic) against blood plasma, and a full step-by-step breakdown. Works on mobile and desktop.

Percent Composition Calculator - Calculate the percent composition of any chemical compound — the mass percent of every element in the formula. Enter a formula like H2O, C6H12O6, or CuSO4·5H2O and get the molar mass, a per-element breakdown table, and a unique side-by-side comparison of composition by mass versus by number of atoms, with element-colored charts and a full step-by-step solution.

Percent Yield Calculator - Calculate the percent yield of a chemical reaction by comparing the actual yield to the theoretical yield. Solve for any unknown variable with detailed step-by-step solutions and efficiency analysis. New

pH Calculator - Calculate pH values from hydrogen ion concentration [H+], pOH, or scientific notation with interactive pH scale visualization and detailed step-by-step calculations.

pKa to Ka Converter - Convert between Ka, pKa, Kb, and pKb instantly. Enter any one of the four acid-base equilibrium constants and this converter computes the other three using pKa = -log10(Ka) and the conjugate-pair relationship pKa + pKb = pKw. See where your acid sits on a visual acid-strength spectrum, how strong its conjugate base is, the approximate percent ionization in a 0.1 M solution, and a full step-by-step breakdown. Includes a reference table of common acids.

Stoichiometry Calculator - Convert between moles, mass, and volume in chemical reactions using balanced equations, molar ratios, and molar masses. Get step-by-step stoichiometric solutions. New

Theoretical Yield Calculator - Enter a balanced chemical equation, choose the product you want to make, and enter how much of each reactant you have (in grams or moles) to instantly find the theoretical yield in both grams and moles. A visual "yield race" shows how much product each reactant could make on its own - the smallest amount is the theoretical yield and reveals the limiting reactant. Molar masses are parsed automatically, with an optional percent-yield calculation and a full step-by-step worked solution.

Titration Calculator - Calculate the molarity of an unknown acid or base solution using titration data. Features equivalence point pH, indicator recommendations, and step-by-step solutions with titration curve visualization. New