ABC CHEMISTRY CALCULATORFree chemistry, physics & maths calculators — 65 tools
Interactive Periodic Table 118 ELEMENTS
Tap any element for atomic mass, electron configuration, oxidation states, electronegativity and more.
Molar Mass & Composition
Enter a formula. Supports brackets and hydrates, e.g. CuSO4.5H2O, Ca(OH)2, KAl(SO4)2.12H2O.
Structure Analyzer SMILES · RDKit
Type a SMILES string for real cheminformatics — molecular formula, average & exact mass, LogP, TPSA, H-bond donors/acceptors, rings, rotatable bonds, stereocentres and a 2D structure — computed by the RDKit engine, the same open-source library used in professional drug-discovery software. Loads only when you open this tool.
Compound Lookup PubChem · free, no key
Type a compound name, formula, CAS number or CID and pull real identifiers & properties from PubChem's public database — IUPAC name, formula, molecular weight, exact mass, SMILES, InChI/InChIKey, XLogP, TPSA, H-bond donors/acceptors, rotatable bonds, complexity, charge — plus PubChem's own 2D structure image. This looks a compound UP in PubChem's database; the Structure Analyzer above computes properties locally from a SMILES you type yourself — use both together.
Chemical Equation Balancer
Use + between species and = (or ->) between sides.
Concentration
Molarity, moles, mass — fill any two.
Dilution (M₁V₁ = M₂V₂)
Leave the unknown blank.
pH / pOH
Enter one value; the rest are derived (25 °C).
Buffer — Henderson–Hasselbalch
pH = pKa + log([A⁻]/[HA])
Oxidation Number
Formula + element → oxidation state. (Standard rules; peroxide/hydride exceptions differ.)
Ideal Gas Law (PV = nRT)
Leave the unknown blank. R = 0.08206 L·atm/mol·K.
Gibbs Free Energy (ΔG = ΔH − TΔS)
Nernst Equation
E = E° − (0.0592/n)·log Q (298 K)
Arrhenius Equation
k = A·e^(−Ea/RT). Leave one blank.
Combined Gas Law (P₁V₁/T₁ = P₂V₂/T₂)
Leave exactly one blank (T in Kelvin).
Graham's Law of Effusion
r₁/r₂ = √(M₂/M₁) — molar mass ya formula.
Equivalent Weight
Eq. wt = Molar mass / n-factor
Scientific Constants
Tap a value to copy. CODATA / standard.
Unit Converter
💰 Currency
Rate is editable — check today’s exact rate online and update it.
📅 Date Calculator
🏷️ Discount
🧾 GST
💪 BMI
🔢 Numeral System
💵 Finance — EMI
Function Plotter
Plot y = f(x). Use x, and functions like sin, cos, sqrt, log, exp, abs, ^.
Converter
Tap an icon — the converter opens.
Kinematics (u, v, a, t, s)
Enter any 3 values, leave the rest blank — the rest are solved.
Force · Work · Energy
Computes F, KE, PE and W from whichever pairs you provide (g = 9.80665).
Ohm’s Law & Power
Enter any 2 of V, I and R.
Coulomb’s Law
Waves (v = fλ)
Enter any 2. Use the c button for light.
Optics — Lens / Mirror
Enter values with sign convention; leave one blank.
Modern — de Broglie & Photon
de Broglie: enter m and v. Photon: enter λ only.
Bohr Model
Beer–Lambert (A = εlc)
Leave one field blank.
Van’t Hoff
Leave either K₂ or ΔH° blank.
Clausius–Clapeyron
Leave either P₂ or ΔHvap blank.
Ksp ↔ Solubility
Salt AxBy — enter either Ksp or s.
Radioactivity / Half-life
Leave one field blank. N = N₀(½)^(t/t½)
Quantum Numbers
Equivalent Weight
Oxidation Number
Mass ⇄ Mole
Formula + (mass ya moles) — doosra nikal jayega.
Electron Configuration
Derivative f′(a), f″(a)
Definite Integral ∫ₐᵇ f dx
Limit lim x→a f(x)
Taylor Series (5 terms)
Equation Solver f(x)=0
Polynomial Roots
Coefficients, highest power first. x³−6x²+11x−6 → 1,-6,11,-6
Matrix (3×3 / 2×2)
Rows me numbers space se, rows new line se.
Complex Numbers
Statistics
Linear Regression
Permutation / Combination
Basic Calculator
Simple +, −, ×, ÷ — for everyday calculations.
Income Tax Calculator (India)
New Regime — FY 2025-26 (AY 2026-27) slabs, §87A rebate & marginal relief ke saath.
Estimate only — surcharge and other deductions may vary.
Calculation Screenshot
Download a branded PNG card of your last calculation — perfect for sharing.
Graph Image
A branded PNG of the function currently plotted in the Graph tab.
Data Download (CSV)
History CSV here; for element data, open any element and export CSV/JSON/TXT.
ABC Chemistry AI Tutor STEP-BY-STEP
Ask any chemistry or calculation question in plain language — balancing, mechanisms, stoichiometry, concepts.
Choose a provider and paste your key. The key is stored only on this device and is never sent anywhere except directly to that provider.
Get a key at console.anthropic.com → API Keys. Model used: Claude Sonnet.
Get a key at platform.openai.com → API keys. Model used: GPT-4o mini.
The app checks abcchemistry.com for a newer version automatically. When the AI confirms a reported bug, it re-checks immediately so you get the fix as soon as it is published.