These chemistry calculators support lab work from first principles through advanced analysis. Determine solution properties with the Molarity Calculator and Osmotic Pressure Calculator, find macromolecule concentrations using the Protein Concentration Calculator and DNA Concentration Calculator, or model Boiling Point Elevation and Ionic Strength for colligative property coursework and solution characterization.
Browse the most-used tools in the ranked list or open the Trending tab to see what researchers and students are calculating right now. Every calculator is free, requires no account, and works on any device.
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Pediatric Dose Volume CalculatorConvert a weight-based dose (mg/kg) into the liquid volume (mL) to administer using the medication concentration. Quick, accurate dosing helper.
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Hydrometer Temperature Correction CalculatorCorrect a hydrometer specific gravity reading for sample temperature versus calibration temperature using the water-density polynomial. Free online tool.
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Proof to ABV Calculator (US)Convert alcohol proof to ABV (% alcohol by volume) instantly. Uses the US standard ABV = Proof ÷ 2. Enter any proof value to get the percentage.
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pH After Dilution CalculatorCalculate the pH of a strong acid or base after dilution. Enter C1, V1 and V2 to get the diluted concentration C2, pH and pOH instantly.
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Dilute Stock to Target Percent CalculatorCalculate how much stock solution and water you need to dilute a concentrated solution to a target percent concentration using V1 = (C2·V2)/C1.
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Chlorine Solution Dilution CalculatorCalculate how much stock chlorine (bleach) to dilute to reach a target ppm. Enter target ppm, final volume, and stock % to get the exact amount.
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Concentration to Absorbance CalculatorCalculate absorbance from concentration using the Beer-Lambert law (A = ε·c·l). Enter molar absorptivity, concentration and path length to get A and %T.
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Ksp from Solubility CalculatorCalculate the solubility product constant (Ksp) from molar solubility for any AnBm salt. Enter s, n, and m to get Ksp and ion terms.
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Serum Osmolality CalculatorCalculate estimated serum osmolality (mOsm/kg) from sodium, glucose, and BUN using the standard 2×Na + Glucose/18 + BUN/2.8 formula.
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Solute Mass from Mass Percent CalculatorCalculate the mass of solute in a solution from its mass percent (% w/w) and total solution mass. Free, instant chemistry concentration tool.
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Buffer pH After Adding Strong Acid/Base CalculatorCalculate the new pH of a buffer after adding strong acid or base using the Henderson-Hasselbalch equation. Enter pKa, moles of acid/base, and moles added.
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Buffer Ratio for Target pH CalculatorFind the conjugate base to acid ratio needed to hit a target pH from the buffer pKa using the Henderson-Hasselbalch equation.
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Molarity After Mixing Two Solutions (Same Solute)Calculate the final molarity when mixing two solutions of the same solute. Enter each concentration and volume to get M_final = (M1V1 + M2V2)/(V1 + V2).
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mEq/L CalculatorConvert mg/L to mEq/L for any electrolyte using its valence and atomic weight. Free milliequivalents per liter calculator with worked examples.
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ppm to Grains per Gallon CalculatorConvert water hardness from ppm (mg/L) to grains per gallon (gpg) instantly. Uses gpg = ppm / 17.118 for accurate water softener sizing.
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Number of Atoms CalculatorCalculate the number of atoms or particles from moles using Avogadro number (6.022 x 10^23). Fast, accurate chemistry conversion tool.
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Solution Density CalculatorCalculate the density of a solution from its total mass and total volume. Get results in g/mL and kg/m³ instantly with this free tool.
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Percent Solution Dilution CalculatorCalculate how much stock solution and diluent you need using C1V1=C2V2 with concentrations in percent. Get V1 and diluent volume instantly.
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Reagent Molarity CalculatorCalculate the molarity (mol/L) of a concentrated acid or reagent solution from its density, percent weight (%w/w) purity, and molar mass.
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Original Concentration from Dilution CalculatorReverse the dilution equation to find the original concentration C1 from the final concentration C2, final volume V2, and initial volume V1.
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Drug Infusion Rate from Dose CalculatorCalculate IV infusion pump rate in mL/hr from a weight-based dose (mcg/kg/min) and solution concentration. Fast, accurate drip rate tool for clinicians.
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% w/v to % w/w CalculatorConvert between % w/v, mg/mL and ppm instantly. 1% w/v = 10 mg/mL = 10000 ppm. Fast solution concentration converter for lab and pharmacy.
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Acid-Base Titration Volume CalculatorCalculate the titrant volume needed to reach the equivalence point in an acid-base titration using Va·Ca·na = Vb·Cb·nb. Free and instant.
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Dilution Factor CalculatorCalculate the dilution factor (fold) needed to reach a target concentration from a stock solution, plus stock and diluent volumes for a given final volume.
Frequently asked questions
What solution chemistry can I calculate here?
You can determine molarity, osmotic pressure, ionic strength, percent ionization of weak acids and bases, protein and DNA concentrations from absorbance or mass values, boiling point elevation from solute concentration, and fertilizer dilution ratios for water-soluble nutrient applications. The tools cover both common classroom problems and everyday laboratory workflows.
How accurate are these chemistry calculators?
Each tool applies well-established equations — the van't Hoff relation for osmotic pressure, Beer-Lambert principles for concentration, and standard colligative property formulas for boiling point elevation. Results are reliable estimates for typical lab conditions. For safety- or protocol-critical work, verify outputs against your governing standard and have a qualified scientist or engineer review the values.
Are the calculators free to use?
Yes. Every calculator is completely free with no login or subscription required. Enter your values — concentration, volume, temperature, or absorbance reading — and get results immediately on any browser or device, without an account.
Do you store the concentrations or sample data I enter?
No. All calculations happen locally in your browser. We do not collect, transmit, or store any of the chemical values, sample data, or experimental figures you enter — your work stays on your device.
Which calculators here are the most popular?
The list is sorted by actual usage, so the tools at the top are the ones students and researchers open most often. Switch to the Trending tab to see what's gaining interest recently, or check Recently Added for the latest additions to this category.
