Simplify Your Workflow: Search MiniWebtool.
Add Extension
See also
Mole/Gram/Particle ConverterLimiting Reactant CalculatorPercent Composition CalculatorTheoretical Yield CalculatorMolar Mass CalculatorEmpirical Formula CalculatorChemical Equation Balancer
Home Page > Miscellaneous > Chemical Calculators > Stoichiometry Calculator

Stoichiometry Calculator

Convert between moles, mass, and volume in chemical reactions using balanced equations, molar ratios, and molar masses. Get step-by-step stoichiometric solutions.

Stoichiometry Calculator

Enter a balanced chemical equation, specify a known quantity, and convert between moles, mass, and volume with step-by-step solutions.

Hโ‚‚O COโ‚‚ NaCl NHโ‚ƒ
Quick Examples
Balanced Chemical Equation
Use -> or โ†’ for the reaction arrow. Coefficients go before formulas (e.g. 2H2O).
Known Substance
โ†’
Target Substance

Embed Stoichiometry Calculator Widget

About Stoichiometry Calculator

The Stoichiometry Calculator converts between moles, mass (grams), and volume (liters at STP) for any substance in a balanced chemical equation. It automatically calculates molar masses from chemical formulas and applies molar ratios to perform conversions, showing each step of the solution so you can follow the reasoning.

Key Concepts in Stoichiometry

โš– Molar Mass

The mass of one mole of a substance in grams per mole (g/mol). Calculated by summing the atomic masses of all atoms in the formula. For example, H2O = 2(1.008) + 15.999 = 18.015 g/mol.

๐Ÿ”— Molar Ratio

The ratio of coefficients from a balanced equation. In 2H2 + O2 โ†’ 2H2O, the ratio of H2 to O2 is 2:1, meaning 2 moles of hydrogen react with every 1 mole of oxygen.

๐Ÿ“ Molar Volume

At Standard Temperature and Pressure (STP: 0ยฐC, 1 atm), one mole of any ideal gas occupies exactly 22.414 liters. This allows direct conversion between moles and volume for gases.

๐Ÿ”„ The Mole Bridge

Stoichiometry problems always go through moles. Convert the known quantity to moles, apply the molar ratio, then convert to the desired unit. This three-step method works for any conversion.

Core Formulas

\( \text{moles} = \frac{\text{mass (g)}}{\text{molar mass (g/mol)}} \)
\( \text{moles} = \frac{\text{volume (L)}}{22.414 \text{ L/mol}} \)  (at STP)
\( \text{moles of B} = \text{moles of A} \times \frac{\text{coefficient of B}}{\text{coefficient of A}} \)

How to Use This Calculator

  1. Enter a balanced chemical equation using standard notation (e.g., 2H2 + O2 -> 2H2O). The calculator parses coefficients and formulas automatically.
  2. Select the known substance from the dropdown and enter its quantity. Choose whether the value is in moles, grams, or liters (for gases at STP).
  3. Select the target substance you want to convert to and pick the desired output unit.
  4. Click Calculate to see the step-by-step solution, including molar mass calculations, molar ratio applications, and unit conversions.
  5. Try the quick examples to see how different reaction types work, from water synthesis to the Haber process.

Common Applications

๐Ÿงซ

Lab Preparation

Calculate how much reagent to measure for an experiment

๐Ÿญ

Industrial Chemistry

Scale reactions for manufacturing and production

๐Ÿ’Š

Pharmaceutical

Determine drug synthesis quantities and yields

๐ŸŒ

Environmental Science

Analyze emissions and chemical pollutant reactions

Frequently Asked Questions

What is stoichiometry?

Stoichiometry is the branch of chemistry that deals with the quantitative relationships between reactants and products in a balanced chemical equation. It uses molar ratios from balanced equations to convert between amounts of different substances.

How do you convert grams to moles?

To convert grams to moles, divide the mass in grams by the molar mass of the substance. The molar mass is the sum of atomic masses of all atoms in the chemical formula, measured in grams per mole (g/mol).

What is a molar ratio?

A molar ratio is the ratio of the coefficients of two substances in a balanced chemical equation. For example, in 2H2 + O2 โ†’ 2H2O, the molar ratio of H2 to O2 is 2:1, meaning 2 moles of hydrogen react with 1 mole of oxygen.

What is molar volume at STP?

At Standard Temperature and Pressure (0ยฐC and 1 atm), one mole of any ideal gas occupies 22.414 liters. This is known as the molar volume at STP and allows conversion between moles and volume for gaseous substances.

Why must the chemical equation be balanced?

A balanced equation ensures conservation of mass and atoms. The coefficients in a balanced equation represent the molar ratios needed for stoichiometric calculations. An unbalanced equation would give incorrect ratios and wrong results.

Reference this content, page, or tool as:

"Stoichiometry Calculator" at https://MiniWebtool.com/stoichiometry-calculator/ from MiniWebtool, https://MiniWebtool.com/

by miniwebtool team. Updated: Mar 16, 2026

Chemical Calculators:

Top & Updated:

Instagram User ID LookupRandom Name Picker WheelRandom PickerImage ResizerFacebook User ID LookupLine CounterSort NumbersRSD Calculator - Relative Standard DeviationFPS ConverterMAC Address GeneratorRemove SpacesWord to Phone Number Converterโฌ› Aspect Ratio Calculator๐Ÿ“ท OCR / Image to TextSun Position CalculatorSun, Moon & Rising Sign Calculator ๐ŸŒž๐ŸŒ™โœจERA CalculatorRandom Quote GeneratorMAC Address Lookup๐Ÿ–ฑ๏ธ Click CounterMerge VideosSlope and Grade CalculatorJob FinderPercent Off CalculatorSquare Root (โˆš) CalculatorWeight Loss CalculatorRandom Truth or Dare GeneratorCm to Feet and Inches ConverterSHA256 Hash GeneratorSum CalculatorBatting Average CalculatorVertical Jump CalculatorMP3 LooperAdd Text to ImageRandom Credit Card GeneratorRandom Poker Hand GeneratorRandom Superpower GeneratorFeet and Inches to Cm ConverterNumber of Digits CalculatorRandom Fake Address GeneratorBitwise CalculatorRoman Numerals ConverterInvisible Text GeneratorRandom IMEI GeneratorSalary Conversion CalculatorPhone Number ExtractorAudio SplitterNumber to Word ConverterRandom Writing Prompt GeneratorImage SplitterRandom Birthday GeneratorText FormatterLog Base 10 CalculatorIP Subnet CalculatorBinary to Gray Code ConverterJulian Date ConverterCaffeine Overdose CalculatorBolt Torque CalculatorLunar Calendar ConverterName RandomizerOctal CalculatorCompound Growth CalculatorRandom Activity GeneratorHalfway Date CalculatorRandom Movie PickerFile Size ConvertereBay Fee CalculatorEmail ExtractorSHA512 Hash GeneratorYouTube Channel StatisticsQuotient and Remainder CalculatorImage CompressorDecimal to BCD ConverterStair CalculatorLeap Years ListLong Division CalculatorFirst n Digits of PiRandom Meal GeneratorWAR CalculatorVideo CompressorOutlier CalculatorHebrew Calendar ConverterBCD to Decimal ConverterWord Ladder GeneratorRandom Loadout GeneratorFlip Video๐Ÿ“… Date CalculatorMaster Number CalculatorOPS CalculatorBcrypt Hash Generator / CheckerCompare Two StringsMD5 Hash GeneratorMultiple Fraction CalculatorSlugging Percentage CalculatorAPI TesterPercent Growth Rate CalculatorAI Language DetectorRandom Number PickerList of Prime NumbersBreak Line by Characters๐Ÿ” Plagiarism CheckerSocial Media Username CheckerDMS to Decimal Degrees ConverterAdd Prefix and Suffix to TextRandomize NumbersIP Address to Hex ConverterArc Length CalculatorDay of the Year Calculator - What Day of the Year Is It Today?Bingo Card GeneratorBroken Link Checker๐ŸŽฐ Gacha Pity CalculatorMultiplication Calculator๐Ÿ”Š Tone GeneratorAstrological Element Balance CalculatorIs it a Prime Number?What is my Zodiac Sign?Percent to PPM ConverterOn Base Percentage CalculatorVideo to Image ExtractorYouTube Tag ExtractorModulo CalculatorGray Code to Binary ConverterAcreage CalculatorVideo SplitterTime Duration CalculatorURL ExtractorSmall Text Generator โฝแถœแต’แต–สธ โฟ แต–แตƒหขแต—แต‰โพCone Flat Pattern (Template) GeneratorMercury Retrograde CalendarNumber ExtractorRemove AccentRandom Chord GeneratorDecibel (dB) CalculatorRandom Tournament Bracket GeneratorSocial Media Post Time OptimizerGreat Circle Distance CalculatorLED Resistor CalculatorName Number CalculatorList RandomizerRandom Emoji GeneratorRandom Object GeneratorWord Scramble GeneratorDay of Year CalendarEstimation CalculatorBattery Life CalculatorRatio CalculatorConnect the Dots GeneratorWHIP CalculatorRandom Math Problem GeneratorSaturn Return CalculatorHeight Percentile CalculatorProportion CalculatorChinese Gender PredictorIP Address to Binary ConverterSquare Numbers ListBinary to BCD ConverterLove Compatibility CalculatorMAC Address AnalyzerGolden Ratio CalculatorRandom Line PickerLottery Number GeneratorText Case ConverterRemove Line BreaksPercentage Increase CalculatorRandom User-Agent GeneratorImage EnhancerFraction CalculatorImage CropperMagic 8-BallRatio to Percentage CalculatorAmortization CalculatorTaco Bar CalculatorBackronym Generator๐Ÿ“Š Bar Graph MakerAngel Number CalculatorPipe Flow CalculatorAdjust Video SpeedScientific Notation to Decimal ConverterWhitespace VisualizerAm I Overweight?HTML CompressorNumber Pattern FinderRandom Video Thumbnail GeneratorFirst n Digits of eLbs to Kg ConverterStandard Error CalculatorWhat is my Lucky Number?Color InverterInvisible Character RemoverReverse VideoRandom Excuse GeneratorPER Calculator๐Ÿ’ง Dew Point CalculatorSigma Notation Calculator (Summation)Effect Size CalculatorMcg to Mg ConverterNumber RandomizerRandom Chess Opening GeneratorAI ParaphraserAI Punctuation AdderSort Lines AlphabeticallyHex to BCD ConverterBCD to Binary ConverterBCD to Hex ConverterMedian CalculatorAverage CalculatorPVIFA CalculatorHypotenuse CalculatorRemove Audio from VideoActual Cash Value CalculatorLog Base 2 CalculatorRoot Mean Square CalculatorSum of Positive Integers CalculatorSHA3-256 Hash GeneratorAI Sentence ExpanderHex to Decimal ConverterRandom Group GeneratorConvolution CalculatorRandom String GeneratorRemove Leading Trailing SpacesMarkup CalculatorPVIF CalculatorDecimal to Hex ConverterInstagram Font GeneratorSocial Media Image Size GuideTikTok Money CalculatorTwitter/X Character CounterTwitter/X Timestamp ConverterYouTube Watch Time CalculatorTwitch Earnings CalculatorYouTube Shorts Monetization CalculatorFacebook Ad Cost CalculatorSocial Media ROI CalculatorCTR CalculatorROAS CalculatorInfluencer ROI CalculatorForce CalculatorAcceleration CalculatorVelocity CalculatorMomentum CalculatorProjectile Motion CalculatorKinetic Energy CalculatorPotential Energy CalculatorWork and Power CalculatorDensity CalculatorPressure CalculatorIdeal Gas Law CalculatorFree Fall CalculatorTorque CalculatorHorsepower CalculatorDilution CalculatorChemical Equation BalancerStoichiometry CalculatorPercent Yield CalculatorEmpirical Formula CalculatorBoiling Point CalculatorTitration CalculatorMole/Gram/Particle ConverterIrregular Polygon Area CalculatorFrustum CalculatorTorus Calculator3D Distance CalculatorCircumscribed Circle (Circumcircle) CalculatorInscribed Circle (Incircle) CalculatorAngle Bisector CalculatorTangent Line to Circle CalculatorHeron's Formula CalculatorCoordinate Geometry Distance CalculatorVolume of Revolution CalculatorSurface of Revolution CalculatorParametric Curve GrapherRiemann Sum CalculatorTrapezoidal Rule CalculatorSimpson's Rule CalculatorImproper Integral CalculatorL'Hรดpital's Rule CalculatorMaclaurin Series CalculatorPower Series CalculatorSeries Convergence Test CalculatorInfinite Series Sum CalculatorAverage Rate of Change CalculatorInstantaneous Rate of Change CalculatorRelated Rates SolverOptimization Calculator (Calculus)Gradient Calculator (Multivariable)Divergence CalculatorCurl CalculatorLine Integral CalculatorSurface Integral CalculatorJacobian Matrix CalculatorNewton's Method CalculatorRREF Calculator (Row Echelon Form)Matrix Inverse CalculatorMatrix Multiplication CalculatorDot Product CalculatorCross Product CalculatorVector Magnitude CalculatorUnit Vector CalculatorAngle Between Vectors CalculatorNull Space CalculatorColumn Space CalculatorCramer's Rule CalculatorMatrix Diagonalization CalculatorQR Decomposition CalculatorCholesky Decomposition CalculatorMatrix Power CalculatorCharacteristic Polynomial CalculatorBayes' Theorem CalculatorF-Test / F-Distribution CalculatorHypergeometric Distribution CalculatorNegative Binomial Distribution CalculatorGeometric Distribution CalculatorExponential Distribution CalculatorWeibull Distribution CalculatorBeta Distribution CalculatorSpearman Rank Correlation CalculatorFisher's Exact Test CalculatorContingency Table CalculatorOdds Ratio CalculatorBernoulli Equation CalculatorSurfboard Volume CalculatorTennis Grip Size CalculatorBackpack Size CalculatorCelsius to Fahrenheit ConverterFahrenheit to Celsius ConverterKm to Miles ConverterMiles to Km ConverterMM to Inches ConverterInches to MM ConverterStone to Kg ConverterKg to Stone ConverterLiters to Gallons ConverterGallons to Liters ConverterML to Oz ConverterOz to ML ConverterSquare Meters to Square Feet ConverterSquare Feet to Square Meters ConverterCubic Feet to Cubic Yards ConverterCubic Meters to Cubic FeetKnots to MPH ConverterMPH to KMH / KMH to MPHMg to Ml ConverterAI Text SummarizerAI TranslatorAI Story GeneratorAI Poem GeneratorAI Song Lyrics GeneratorIndian Land Unit ConverterTola to Gram ConverterPX to REM ConverterPT to PX ConverterMerge PDFSplit PDFCompress PDFPDF to JPGJPG to PDFRotate PDFDelete PDF PagesAdd Page Numbers to PDFProtect PDFReorder PDF PagesPDF Word CounterPDF Page ExtractorPDF to Text ExtractorUnlock PDF (Owner-Password Removal)PDF Flatten ToolAI Rap Lyrics GeneratorAI Cover Letter GeneratorAI Resume Bullet GeneratorAI LinkedIn Headline & Bio GeneratorAI Instagram Caption GeneratorAI YouTube Title & Description GeneratorAI Video Script GeneratorAI Product Description GeneratorAI Press Release GeneratorAI Wedding Speech GeneratorAI Thank-You Note GeneratorAI Dream InterpreterRandom Question GeneratorWould You Rather GeneratorNever Have I Ever GeneratorIcebreaker Question GeneratorCharades GeneratorPictionary Word GeneratorHangman Word GeneratorTrivia Question GeneratorRandom Fact GeneratorRandom Joke GeneratorDad Joke GeneratorPickup Line GeneratorCompliment GeneratorDaily Affirmation GeneratorJournal Prompt GeneratorDrawing Idea GeneratorFortune Cookie GeneratorFantasy Name Generator