Chemistry Calculators
Concentration, molar mass, reactions and more chemistry tools.
Molarity Calculator
Enter solute mass, molar mass and solution volume to instantly compute moles of solute and molarity (mol/L, i.e. M), with a reference table of common reagent molar masses.
Serial Dilution Calculator
Enter the initial concentration C₀, dilution factor d and number of steps n; using Cₙ = C₀ × dⁿ the tool instantly computes the final concentration after serial dilution and the per-step volume scheme.
DNA Molecular Weight Calculator
Paste a DNA sequence (A/T/C/G/ or IUPAC ambiguous codes); the tool instantly computes molecular weight (MW), base count, length and extinction coefficient, and estimates OD and mass for a given concentration.
Buffer pH Calculator
Enter a weak acid's pKa, conjugate base concentration [A⁻] and weak acid concentration [HA]; using the Henderson–Hasselbalch equation the tool instantly computes the buffer pH and the [A⁻]/[HA] ratio — ideal for preparing buffers.
pH Calculator
Enter [H⁺] (or [OH⁻], or pH/pOH, depending on mode); the tool instantly computes pH, pOH, [H⁺] and [OH⁻], and shows whether the solution is acidic, neutral or basic.
Protein Molecular Weight Calculator
Enter the amino-acid residue count and average residue mass; the tool instantly estimates the protein molecular weight (Da and kDa) to quickly read SDS-PAGE bands and sequence size.
Molar Extinction Coefficient Calculator
Enter absorbance A, molar concentration c and path length l; by the Beer–Lambert law the tool instantly computes the molar extinction coefficient ε (M⁻¹·cm⁻¹), used to quantify nucleic acids and proteins.
Salinity (EC) Calculator
Enter the electrical conductivity (EC) of soil or irrigation water and a conversion factor; the tool instantly estimates total dissolved solids TDS (mg/L = ppm) and salt content (g/L) to assess water quality and salt-stress risk.
Dilution Calculator
Enter the stock concentration, target concentration and target volume; using C₁V₁ = C₂V₂ the tool instantly computes the required stock (concentrate) volume, the solvent (water) volume to add and the dilution factor.
Percent Yield Calculator
Enter the actual yield from the experiment and the theoretical yield from stoichiometry; using %yield = (actual / theoretical) × 100% the tool instantly computes the percent yield of a reaction.
Mass Percent Calculator
Compute the mass percent (w/w%) of a solute in a solution from solute and solution masses.
Radioactive Decay Calculator
Enter the initial amount N₀, half-life T½ and elapsed time t; using N = N₀·(½)^(t/T½) the tool instantly computes the remaining amount and activity and the decayed fraction.