Accounting & Financial Statement Analysis 10 calculators
- Days Inventory Outstanding CalculatorUS GAAP ASC 330 / IFRS IAS 2 · 365-day conventionDays inventory outstanding converts your stock into the unit operations teams actually manage: days. Enter cost of goods sold…
- Days Sales Outstanding (DSO) CalculatorStandard DSO & Best Possible DSO definitionsDays sales outstanding is the average number of days your invoices wait before turning into cash. Enter the receivable balance…
- Debt Service Coverage Ratio CalculatorDSCR — cash available for debt service ÷ total debt serviceThe debt service coverage ratio is the single number a commercial lender underwrites to: cash available for debt service…
- Debt-to-EBITDA Leverage Ratio CalculatorCredit-agreement leverage ratio — EBITDA is non-GAAP (SEC Regulation G)Debt-to-EBITDA states leverage in turns: how many years of current earnings before interest, tax, depreciation and amortisation…
- Debt-to-Equity Ratio CalculatorUS GAAP / IFRS balance-sheet definitionsYour debt-to-equity ratio says how many dollars of borrowed money stand behind every dollar of owners’ capital. This calculator…
- Debt-to-Total-Assets Ratio CalculatorUS GAAP / IFRS balance-sheet definitionsYour debt-to-total-assets ratio says what share of everything the company owns was paid for with borrowed money. This…
- Diluted EPS CalculatorASC 260 / IAS 33Diluted earnings per share answers a specific question: what would EPS be if every contract that can turn into common stock…
- Direct Labor Rate & Efficiency Variance CalculatorStandard costing, two-variance labor modelThis calculator splits your total direct labor variance into the two components a cost accountant has to report: the rate…
- Direct Material Price & Quantity Variance CalculatorStandard costing, two-variance materials modelEnter the price you actually paid, your standard price, the quantity you actually consumed and the output it produced, and this…
- DuPont Analysis (ROE Decomposition) CalculatorDuPont identity — 3-step and 5-stepReturn on equity tells you how large the return was; the DuPont identity tells you where it came from. Enter revenue, EBIT…
Calculus, Linear Algebra & Discrete Math 7 calculators
- Definite Integral CalculatorFundamental Theorem of Calculus; adaptive Simpson quadratureEnter an integrand and two limits and this calculator evaluates the definite integral by adaptive Simpson quadrature, refining…
- Derivative CalculatorStandard differentiation rules (power, product, quotient, chain)Type a function of one variable and this calculator differentiates it symbolically, simplifies the result, and evaluates the…
- Dijkstra's Shortest Path CalculatorDijkstra's algorithm (1959)Enter a weighted graph as a list of edges - A-B:4, A-C:2 and so on - choose a source and a target, and this calculator runs…
- Directional Derivative CalculatorDirectional derivative Dᵤf = ∇f · uEnter a function of two or three variables, a point and a direction vector, and this calculator returns the directional…
- Divergence of a Vector Field CalculatorVector calculus: ∇·F in orthogonal curvilinear coordinatesEnter the three components of a vector field and a point, choose Cartesian, cylindrical or spherical coordinates, and this…
- Dot Product CalculatorEuclidean inner productType two vectors as lists of numbers and this calculator multiplies matching components, adds them, and shows every term of…
- Double Integral CalculatorFubini's theorem for iterated integrals; polar area element r dr dθA double integral adds up a quantity over a two-dimensional region, and Fubini's theorem lets you do it as two ordinary…
Corporate Finance & Valuation 7 calculators
- Days Payable Outstanding (DPO) CalculatorFASB ASU 2022-04 (supplier finance disclosure)Days payable outstanding tells you how many days of cost of sales you are currently financing with supplier credit rather than…
- DCF Enterprise Value CalculatorUnlevered DCF (FCFF discounted at WACC)This calculator runs a full unlevered discounted cash flow model. You give it a base free cash flow to the firm, a growth rate…
- Degree of Financial Leverage (DFL) CalculatorDegree of financial leverage (fixed-charge elasticity)The degree of financial leverage is the elasticity of earnings per share with respect to operating profit. A DFL of 2.0 says a…
- Degree of Operating Leverage (DOL) CalculatorContribution-margin operating leverageThe degree of operating leverage is the elasticity of operating profit with respect to sales volume. A DOL of 3.5 means a 10%…
- Discounted Payback Period CalculatorDiscounted payback (present-value capital recovery)The discounted payback period is how long an investment takes to repay its cost once every future receipt is valued at what it…
- Double Declining Balance Depreciation CalculatorASC 360 / IAS 16 accelerated depreciationDouble declining balance is the accelerated depreciation method that charges a fixed percentage of the remaining book value…
- DuPont ROE Calculator (3-Step)DuPont identity (3-step)This calculator breaks return on equity into the three factors that multiply to produce it: net profit margin, asset turnover…
Automotive, Diesel & Motorsports 4 calculators
- Density Altitude Calculator for RacingISA density relation; SAE J1349 correction factorDensity altitude is the single number that tells you how much air the engine has to work with. It is the altitude in the…
- Downforce & Aerodynamic Drag CalculatorSAE J1263 road load; ICAO/US Standard Atmosphere densityAerodynamic force rises with the square of speed and the power to overcome it rises with the cube, which is why a car that…
- Drivetrain Loss & Crank Horsepower CalculatorPercentage drivetrain loss conventionA chassis dyno measures power at the tyres. A manufacturer quotes power at the flywheel. Between them sits the gearbox…
- Dynamic Compression Ratio CalculatorSlider-crank piston position, polytropic compressionStatic compression ratio assumes the intake valve shuts at bottom dead centre. It never does. On any cam worth fitting the…
Investing & Retirement 4 calculators
- Dividend Payout Ratio CalculatorPayout ratio = DPS ÷ EPSThe dividend payout ratio tells you what share of a company's earnings is handed to shareholders as cash rather than kept…
- Dividend Reinvestment (DRIP) CalculatorTotal return with dividends reinvestedThis calculator follows a dividend-paying position payment by payment: each dividend buys more shares, those shares earn the…
- Dividend Yield CalculatorForward and trailing yield conventionsEnter the dividend one share receives per payment, how often it is paid, and the current share price, and this calculator…
- Dollar-Cost Averaging CalculatorHarmonic-mean cost averagingPaste the price you paid at each purchase and this calculator returns the three numbers that matter: how many shares or units…
Personal Finance, Loans & Credit 4 calculators
- Debt Avalanche CalculatorHighest-rate-first (avalanche) allocationWhen several debts compete for the same money, the order you clear them in changes what the whole exercise costs. The avalanche…
- Debt Consolidation Loan CalculatorRegulation Z (12 CFR 1026)A consolidation loan is worth taking when the interest it saves exceeds the fee it charges — and not otherwise. This calculator…
- Debt Snowball CalculatorDeclining-balance amortisation, monthly compoundingThe debt snowball pays your debts in order of smallest balance first , ignoring interest rates, and rolls every payment freed…
- Debt-to-Income Ratio CalculatorFannie Mae Selling Guide B3-6-02 / HUD Handbook 4000.1Your debt-to-income ratio is the single number that decides most mortgage applications. This calculator produces both halves of…
Biology, Genetics & Clinical Lab 3 calculators
- Delta Delta Ct Fold Change CalculatorLivak & Schmittgen 2^-ΔΔCt method; MIQE guidelinesEnter four Ct values — your target gene and your reference gene, each in the treated and the control sample — and this…
- Diagnostic Likelihood Ratio CalculatorBayes' theorem in odds form (Fagan nomogram)A likelihood ratio tells you how much a test result should move your belief, in a form that does not depend on how common the…
- DNA / RNA Concentration from A260 CalculatorBeer–Lambert law with standard A260 conversion factors (Sambrook, Molecular Cloning)This calculator turns a 260 nm absorbance reading into the three numbers you actually need at the bench: concentration in…
Construction, Carpentry & Concrete 3 calculators
- Deck Board CalculatorAWC DCA 6 framing practiceEnter the deck's dimensions, the actual width of the board you are buying and the gap you will hold between boards, and this…
- Deck Footing Size & Load CalculatorAWC DCA 6-2015; IRC Table R401.4.1A deck footing is sized by a single idea: work out how much deck each post carries, turn that into pounds, and divide by what…
- Drywall Sheet CalculatorGA-216 gypsum panel applicationEnter a room's length, width and ceiling height and this calculator returns the drywall takeoff a hanger actually needs: sheet…
Cooking, Baking & Brewing 3 calculators
- Desired Dough Temperature Water CalculatorDesired dough temperature (DDT) methodDough temperature is the one variable that decides whether a schedule written in a cool spring kitchen still works in August…
- Dough Hydration CalculatorBaker's percentage hydrationHydration is the water in a dough divided by the flour in that dough, written as a percentage of flour weight in the usual…
- Dry Brine Salt CalculatorDry brining is pre-salting: you weigh the meat, apply a percentage of its weight in salt, and let time carry the salt inward…
Everyday Life & Household 3 calculators
- Diaper Cost CalculatorDiapers are a fixed line in a new family's budget, and the total is larger than most parents expect because it accrues one…
- Dog Age in Human Years CalculatorAAHA canine life stages (2019)This calculator converts your dog's age into human-equivalent years two ways at once. The first is the epigenetic clock…
- Dog Water Intake CalculatorNRC (2006) allometric maintenance requirementA dog's daily water requirement tracks its energy requirement almost exactly — roughly one millilitre of water per kilocalorie…
HVAC, Refrigeration & Building Science 3 calculators
- Dehumidifier Size CalculatorASHRAE Fundamentals psychrometrics; ANSI/AHAM DH-1This calculator sizes a dehumidifier the way a moisture load is actually calculated: it converts your outdoor and target indoor…
- Dew Point Calculator (from Temperature & RH)Magnus-Tetens with WMO coefficientsDew point is the temperature at which the air you are standing in becomes saturated, and it is the number that decides whether…
- Duct Size Calculator (Equal Friction & Velocity Method)ASHRAE / ACCA Manual D friction equationEnter the airflow a duct has to carry and the friction rate your design allows, and this calculator returns the round diameter…
Insurance & Risk Management 3 calculators
- Disability Elimination Period CalculatorChoosing a longer elimination period on a disability policy is the cheapest premium reduction on the quote sheet, and it is the…
- Disability Insurance Benefit CalculatorIRC §104(a)(3) and §105(a) — taxability of disability benefitsA policy advertised as replacing 60% of income rarely replaces 60% of income. Four things stand between the headline percentage…
- Dwelling Coverage A Replacement Cost CalculatorISO HO-3 coverage structure and loss settlement conditionCoverage A is the limit that rebuilds your house, and it has almost nothing to do with what the house would sell for. Market…
Time, Date, Navigation & Astronomy 3 calculators
- Day of the Week CalculatorZeller's congruence (1882); ISO 8601 weekday numberingEnter any date and this calculator returns the weekday, the ISO 8601 weekday number, the day of the year and the Julian Day…
- Daylight Hours & Day Length CalculatorNOAA solar position algorithm (after Meeus, Astronomical Algorithms)This calculator gives the hours of daylight at any latitude on any date, together with the change from the day before, the…
- Daylight Saving Time Change Date CalculatorUS Energy Policy Act 2005; EU Directive 2000/84/ECDaylight saving transitions are defined by a rule, not by a published list, so you can compute them for any year. This…
Agriculture, Livestock & Landscaping 2 calculators
- Drip Irrigation Flow Rate & Run Time CalculatorASABE EP405.1, Design and Installation of Microirrigation SystemsA drip zone is only as good as its flow arithmetic: too many emitters on one valve and the far end starves, too few and the run…
- Dry Matter Intake (DMI) CalculatorNRC Nutrient Requirements of Dairy Cattle, 7th rev. ed. (2001)Every ration is balanced on a dry matter basis, but every feed is delivered wet. This calculator closes that gap. It predicts…
Arithmetic, Algebra & Number Theory 2 calculators
- Decimal to Fraction CalculatorExact rational conversionType a decimal and this calculator returns the exact fraction it equals, reduced to lowest terms, with the greatest common…
- Dividing Fractions CalculatorDivide one fraction or mixed number by another and get the exact quotient in lowest terms, as a mixed number, and as a decimal…
Aviation, Aerospace & Marine 2 calculators
- Density Altitude CalculatorICAO Standard Atmosphere (ISO 2533)Density altitude is the altitude your aeroplane's wing, propeller and engine think they are at. Enter field elevation, the…
- Distance to Horizon & Visibility Range CalculatorBowditch, The American Practical NavigatorYour horizon at sea is closer than most people expect: from a cockpit nine feet above the water it is only 3.5 nautical miles…
Business, Marketing & E-commerce 2 calculators
- Dimensional Weight & Billable Weight CalculatorIATA volumetric weight & carrier DIM divisorsCarriers do not bill the weight on your scale. They bill the greater of actual weight and dimensional weight — the volume of…
- Dropshipping Profit Margin CalculatorContribution margin methodThis calculator answers the two questions that decide whether a dropshipping product is worth running: how much each order…
Computing, IT, Networking & Security 2 calculators
- Data Compression Ratio CalculatorSNIA data reduction ratio conventionsCompression is quoted two ways and the two do not behave alike. A ratio of 4:1 sounds twice as good as 2:1, but it saves 75% of…
- Data Transfer Time CalculatorDecimal SI and IEC 80000-13 binary prefixesEnter how much data you have to move and how fast the link is, and this calculator returns the elapsed time in days, hours…
Electrical Trade & Electronics 2 calculators
- dBm to Watts CalculatordBm is a power level expressed on a logarithmic scale referenced to one milliwatt, and it exists because RF systems span an…
- Dwelling Load Calculation CalculatorNEC 2023 (NFPA 70) Article 220, Part IIIThis calculator runs the standard method dwelling load calculation from Article 220 of the National Electrical Code and returns…
Geometry & Trigonometry 2 calculators
- Degrees to Radians CalculatorSI angular measure (BIPM SI Brochure, 9th ed.)Enter an angle in degrees and read it back in radians, both as a decimal and as an exact multiple of π. You can type a plain…
- Distance Formula CalculatorEuclidean metric in the Cartesian planeEnter the coordinates of two points and this calculator returns the straight-line distance between them, the exact answer in…
Home Improvement Projects & Renovation 2 calculators
- Demolition Debris & Dumpster Size CalculatorTypical construction and demolition debris densitiesThis calculator turns a demolition scope into two numbers a container is billed on: loose volume in cubic yards and weight in…
- DIY vs Contractor Cost CalculatorOpportunity-cost comparisonThis calculator answers the only question that matters when you are holding a contractor's quote: does doing it yourself…
Legal, Claims & Settlements 2 calculators
- Debt Settlement vs Bankruptcy Cost CalculatorIRC 108 cancellation-of-debt income; 11 U.S.C. chapter 7Debt settlement is advertised as costing a fraction of what you owe, and the advertised fraction is never the price. The real…
- Divorce House Buyout CalculatorConventional 28/43 qualifying ratios; Fannie Mae limited cash-out refinance treatmentKeeping the marital home means two separate things have to work at once: you have to pay your spouse for their half of the…
Music Theory, Audio Engineering & Instruments 2 calculators
- Decibel Addition CalculatorEnergy summation of levels; geometric spreading per ISO 9613-2Decibels are logarithms, so they do not add. Two machines at 85 dB each do not make 170 dB, and they do not make 85 dB either -…
- Delay & Reverb Time CalculatorTempo defined as quarter notes per minuteA delay that is not locked to the tempo fights the groove; one that is locked disappears into it. The arithmetic is one…
Plumbing, Piping & Hydraulics 2 calculators
- Darcy-Weisbach Pressure Loss CalculatorDarcy-Weisbach with Colebrook-White friction factorEnter a flow rate, a pipe size and a fluid, and this calculator returns the friction head loss and pressure drop across the run…
- Drainage Fixture Unit (DFU) CalculatorIPC Chapter 7 drainage sizing tablesCount the fixtures on the segment you are sizing and this calculator totals their drainage fixture units, then returns the…
Professional Licensing & Applied Exam Math 2 calculators
- Diminished Value 17c Calculator17c formula (Mabry v. State Farm); market-appraisal methodA repaired vehicle is worth less than one that was never wrecked, and diminished value is that gap. This calculator runs the…
- Drone Flight Time CalculatorMomentum (actuator-disk) theoryThis calculator estimates how long a multirotor will stay up. Give it the pack capacity, cell count and the fraction of the…
Unit & Measurement Conversion 2 calculators
- Data Storage Unit Converter (GB vs GiB)IEC 80000-13:2008 binary prefixes / SI decimal prefixesConvert any data size between the decimal units drive makers print on the box — kB, MB, GB, TB, PB — and the binary units…
- Decimal Inches to Fraction CalculatorInternational inch, 1959 (1 in = 25.4 mm exactly)This converter turns a decimal inch measurement into the nearest fraction you can actually find on a rule — halves through…