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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Mass Percent to Moles CalculatorCalculate moles of solute from molarity and volume using n = M × V. Enter mol/L and liters to get the amount of substance in moles instantly.
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Path Length from Absorbance CalculatorCalculate solution concentration from absorbance using the Beer-Lambert law: c = A / (ε · l). Enter absorbance, molar absorptivity, and path length.
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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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Grams per Gallon Fertilizer to PPM CalculatorConvert grams of fertilizer per gallon or liter into N-P-K ppm. Enter weight, nutrient percentage, and water volume to get parts-per-million instantly.
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Buffer pH CalculatorCalculate the pH of a buffer solution from pKa and conjugate base/acid concentrations using the Henderson–Hasselbalch equation. Free and instant.
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Henderson-Hasselbalch CalculatorCalculate buffer solution pH with the Henderson-Hasselbalch equation from pKa and the conjugate base to weak acid concentration ratio.
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Moles to Grams CalculatorConvert moles to grams instantly. Enter the amount in moles and the molar mass (g/mol) to find mass using mass = moles × molar mass.
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Water to Add for Dilution CalculatorFind how much water to add to dilute a solution from one concentration to a lower target. Uses V_water = V1·(C1−C2)/C2. Free and instant.
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Acid Dilution Preparation CalculatorCalculate how much concentrated stock acid and water you need to prepare a dilute acid solution at a target molarity and volume using M1V1 = M2V2.
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Final Concentration After Mixing Two Solutions CalculatorCalculate the final concentration when two solutions are mixed using C_final = (C1·V1 + C2·V2)/(V1+V2). Free, fast, and unit-agnostic.
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Molarity to Mass Percent CalculatorConvert molarity (mol/L) to mass percent (% w/w) using molar mass and solution density. Free, instant chemistry concentration converter.
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Percent by Mass (%w/w) CalculatorCalculate percent by mass (%w/w) of a solution from the mass of solute and the total mass of solution. Free, instant chemistry concentration tool.
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Stock Volume Needed Calculator (V1 = C2V2 / C1)Find the stock volume (V1) needed to make a diluted solution. Solve V1 = (C2 × V2) / C1 from the dilution equation and get diluent to add.
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Molarity from Grams and Volume CalculatorCalculate molarity (mol/L) from grams of solute, molar mass, and solution volume. Free chemistry tool using M = (mass / molar mass) / volume.
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Final Concentration from Dilution Factor CalculatorCalculate the final concentration of a diluted solution from its stock concentration and dilution factor using C_final = C_stock / DF.
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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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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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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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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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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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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.
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.
