Laboratory Calculators

Every calculator on the site, grouped by the job at the bench. Each one shows the formula and the steps with your numbers, keeps its inputs in the link so you can share or repeat a result, and prints a dated record. Nothing you type is uploaded.

Solutions and dilutions

• Dilution calculator (C1V1 = C2V2) — stock volume, final concentration or final volume for a single dilution.
• Dilution ratio calculator — 1:10, 1:64 per gallon and other ratios in both conventions, and the dilution factor.
• Serial dilution calculator — a dilution series tube by tube, plus CFU/mL from a plate count.
• Alcohol dilution calculator — water to add to bring ethanol or a spirit to a target ABV or proof.
• Concentration converter — molar, mass per volume, percent, ppm and ppb in one table.
• PPM calculator — ppm, ppb, percent and mg/L conversions, ppm from amounts, gas ppm to mg/m³.

Chemistry

• Molarity calculator — mass to weigh out, molarity of a solution, or molarity of a concentrated acid.
• Molecular weight calculator — molar mass and element composition from a chemical formula.
• Mass to moles calculator — grams, moles and number of particles.
• Titration calculator — unknown concentration, equivalence point and the titration curve.
• Significant figures calculator — count, round and calculate with sig fig rules.
• Stoichiometry calculator — balance an equation, find the limiting reagent, theoretical yield and percent yield.
• pH calculator — pH, pOH, [H⁺] and [OH⁻], and the pH of strong and weak acids and bases.
• Percent recovery calculator — recrystallization recovery, spike recovery and percent yield.
• Specific gravity calculator — density, specific gravity and API gravity.

Buffers

• Buffer calculator — grams of acid and base forms for a target pH (acetate, Tris, MOPS and more), and pH from concentrations.
• Phosphate buffer calculator — sodium or potassium phosphate at a target pH, from salts or stock solutions, and PBS.

Cell culture

• Hemocytometer calculator — cells/mL and viability from Neubauer chamber counts.
• Cell seeding calculator — suspension and medium volumes for plates, dishes and flasks.
• Doubling time calculator — doubling time, growth rate and projected cell numbers.
• RPM to RCF calculator — centrifuge speed to g-force and back for your rotor radius.

DNA and protein

• DNA concentration calculator — µg/mL from A260, purity ratios and oligo concentration.
• DNA molarity calculator — ng/µL to nM, pmol and copy number for DNA or RNA of a given length.
• Ligation calculator — insert mass for a chosen insert:vector molar ratio.
• Protein molecular weight calculator — mass and composition of a protein sequence.
• Protein concentration calculator — mg/mL from A280 and the extinction coefficient.

Materials testing

• Stress strain calculator — engineering stress, strain, Young’s modulus and elongation.