Chemistry tools
Lab maths, analysis, kinetics, electrochemistry and more. 36 free tools, with no sign-up. Nothing you enter leaves your device.
General and lab chemistry 3
- Molar mass calculatorType any formula, including brackets, hydrates, isotope labels and charges, for its molar mass, exact mass, percentage of each element, and a grams, moles and particles converter. #78
- Equation balancerBalance any chemical equation, including ionic and redox ones, check the atoms on both sides, then find the limiting reagent, the theoretical yield, what is left over and your percent yield. #79
- Solutions and dilutions calculatorWork out how much to weigh for a solution in M, mM, mg/mL, % w/v or ppm, how much stock to dilute, and a full serial dilution plan with volumes for every tube. #30
Organic chemistry 3
- IR spectrum band finderType the peaks of an infrared spectrum, or open the spectrum itself, and see which bonds and functional groups each band could belong to: carbonyls, O–H, N–H, nitriles, aromatics and more, with groups that need several bands checked together and a searchable band table. #109
- Reaction equivalents tableThe reagent table of a lab notebook: molar masses from formulas, equivalents, density, purity and solution molarity, giving the mass to weigh or volume to measure for every reagent, and the theoretical and percent yield. #85
- TLC Rf calculatorOpen a photo of a TLC plate, tap the baseline, solvent front and spots, and get each spot's Rf, its lane, the column volumes it needs on a flash column and how well neighbouring spots separate. Or type measured distances. #91
Analytical chemistry 7
- Isotope pattern calculatorExact m/z of [M+H]+, [M+Na]+, [M−H]− and other ions, the full isotope pattern at your instrument's resolving power, and a check of your measured peaks with the ppm error. #80
- Titration curve simulatorDraw the exact pH curve for strong, weak and polyprotic acids and bases, see the equivalence points and the right indicator, and find the end point of your own measured titration from its derivatives. #82
- Beer–Lambert calculatorSolve A = εlc for absorbance, molar absorptivity, path length or concentration, convert to transmittance, check the reading is in the reliable range, and view UV-Vis spectra with their maxima. #84
- Chromatography calculatorResolution, retention factor, selectivity, plate number and HETP for two peaks, the plates needed for a target resolution, and moving an HPLC method to a shorter, narrower column (flow, injection, gradient times, USP <621> L/dp check). #86
- Method validation statisticsPaste replicate results by day, analyst or instrument: mean, SD, RSD and confidence interval, the Grubbs outlier test, bias and recovery against a true value, repeatability and intermediate precision by ANOVA, and the Horwitz ratio. #87
- Calibration curve with LOD and LOQPaste your standards and get the calibration line, R², limits of detection and quantitation (ICH Q2), and the concentration of each unknown with a 95 % interval. #28
- NMR solvent and impurity peak checkerPaste a peak list (even a journal-style one) and see which peaks are residual solvent, water, grease or common lab solvents such as ethyl acetate, DCM and ether, in CDCl₃, DMSO-d₆, CD₃OD, D₂O and six more, for ¹H and ¹³C. #106
Physical chemistry 7
- Colligative properties calculatorFreezing point, boiling point, vapour pressure and osmotic pressure of a solution in water or 10 other solvents, with the van 't Hoff factor, and the molar mass of an unknown from a measured freezing point drop, boiling point rise or osmotic pressure. #88
- Reaction kinetics fitterPaste concentration against time to find the reaction order, the rate constant with its uncertainty and the half-life; paste k at several temperatures for the activation energy, A, ΔH‡ and ΔS‡. #81
- Equilibrium solverType any reaction and K: the exact ICE table, Q and which way it goes, conversion, Kp ↔ Kc and pH for acids and bases; then add or remove a species, squeeze the volume or change the temperature and watch the equilibrium shift. #89
- Gas law calculatorWork out pressure, volume, amount or temperature of a gas in any units, with the mass and density of a named gas, the van der Waals real-gas answer and how far the ideal gas law is off. #83
- Diatomic spectroscopy calculatorVibrational and rotational spectroscopy of diatomic molecules (HCl, CO, H₂, N₂, O₂, HF, I₂ or your own constants): fundamental and overtones, force constant, bond length, the simulated IR spectrum with P and R branches at any temperature, the Morse potential with its levels, isotope substitution, and a fit of ωe and ωexe. #94
- Thermochemistry calculatorType a balanced reaction and get its standard enthalpy, entropy and Gibbs energy change, the equilibrium constant, ΔG and K at other temperatures, and the temperature where the reaction turns spontaneous. Values for 38 common substances fill in by themselves; type your own for anything else. #95
- Binary phase diagram and lever rule calculatorDraw the phase diagram of a two-component mixture from the melting points and enthalpies of fusion (complete solid solution like Cu–Ni, or a simple eutectic like Bi–Cd), find the phases, their compositions and amounts at any temperature, and use the lever rule on compositions read off any real diagram, in wt % or mol %. #108
Inorganic and coordination chemistry 3
- Crystal field and spin state calculatorPick a d-block metal ion and a geometry (octahedral, tetrahedral, square planar, square pyramidal), give Δ and the pairing energy or an absorption band, and get the d-orbital diagram, high or low spin, CFSE, unpaired electrons, spin-only moment and the Jahn–Teller tendency. #93
- 18-electron rule and oxidation state checkerPick the metal, the charge and the ligands (CO, phosphines, halides, Cp, arenes, allyl, hydride, oxo and more) to get the valence electron count, the metal's oxidation state, its dⁿ count and the L/X bond classification, with both the covalent and ionic counts and 15 textbook examples. #107
- Molecular point group finderPaste a molecule's XYZ coordinates or open an .xyz file to get its point group (C₂ᵥ, D₃h, T_d, O_h, I_h and the rest), every symmetry element, the group order, and whether the molecule can be chiral or polar. No coordinates? Answer the flowchart questions instead. 23 example molecules. #110
Computational chemistry 1
Electrochemistry and battery science 6
- Cyclic voltammetry analyserPaste or open a cyclic voltammogram for peak potentials and currents with a baseline, ΔEp, E½, Ep − Ep/2 and Nicholson's peak ratio; solve the Randles–Sevcik equation for D, concentration or area; and fit a scan-rate study. #90
- Nernst and cell potential calculatorElectrode potentials at any concentration, pH and temperature by the Nernst equation, and full galvanic cells: E°cell, Ecell, the balanced cell reaction, cell notation, ΔG, K and Q. Pick from 44 standard half-reactions or type your own, and convert potentials between SHE, SCE, Ag/AgCl and RHE. #96
- Electroplating and electrolysis calculatorPlating thickness from current, time and area, or the time or current needed for a thickness, for copper, nickel, zinc, chrome, silver, gold, tin and more (or your own metal), with current efficiency, current density in A/dm² and ASF, plating rate, mass and charge. Also gas volumes from electrolysis of water or brine. #97
- Battery cycling data analyserPaste or open per-cycle charge and discharge capacities for first-cycle efficiency, average coulombic efficiency, retention, fade per cycle and cycles to 80 %. Paste one voltage curve for incremental capacity (dQ/dV) and its peaks. Works with exports from any cycler. #104
- Corrosion rate from Tafel plotsPaste or open a potentiodynamic polarisation scan for Ecorr, icorr and both Tafel slopes by Tafel extrapolation, a Wagner–Traud fit and Stern–Geary (Rp), then the corrosion rate in mm/y and mpy by ASTM G102. Also works out weight-loss coupon rates. #105
- Impedance (EIS) equivalent circuit fitterPaste or open an electrochemical impedance spectrum and fit an equivalent circuit (R(RC), R(RQ), Randles with Warburg diffusion, two-arc R(RQ)(RQ) or a blocking CPE) by complex non-linear least squares. Get each element with its error, the effective capacitance, time constants, exchange current density and a comparison of all circuits. #111
Polymer chemistry 4
- Polymer molar mass calculator (GPC)Number- and weight-average molar mass, Mz, Mp, dispersity (PDI) and degree of polymerisation from a GPC/SEC trace with a calibration fitted to your standards, or from a list of chain masses. Paste the data or open a CSV or Excel file; see the distribution and the integration baseline. #100
- Copolymer composition and reactivity ratio calculatorCopolymer composition from the feed and reactivity ratios (Mayo–Lewis), the azeotropic feed, and how feed and copolymer composition drift with conversion in a batch. Fit r₁ and r₂ to your own data by Fineman–Ross, Kelen–Tüdős and non-linear least squares; paste or open CSV or Excel. #101
- Glass transition (Tg) calculatorEstimate the Tg of a random copolymer or miscible blend by the Fox equation and find the monomer ratio for a target Tg. Gordon–Taylor (with Simha–Boyer or your own k, and Kwei q) for a polymer with water or a plasticiser, and Flory–Fox for short chains. #102
- DSC and TGA curve analyserPaste or open a DSC scan to get Tg (onset, midpoint, end, ΔCp), melting and crystallisation peaks with onset and enthalpy, and percent crystallinity. Paste a TGA run for the mass loss steps, DTG peaks, T at 5 % loss, residue and which molecule each step lost. #103
Green chemistry and safety 1
Nuclear and radiochemistry 1
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