Business, Marketing & E-commerce 8 calculators
- A/B Test Sample Size CalculatorTwo-proportion normal approximation (Fleiss)Enter your current conversion rate, the smallest lift worth acting on, and your daily traffic. You get the visitors each…
- A/B Test Statistical Significance CalculatorTwo-proportion z-test (pooled variance)Enter the visitors and conversions for your control and your variant, and this calculator runs the two-proportion z-test that…
- Ad Budget Forecast CalculatorMarketing Metrics (Farris et al.) funnel arithmeticSet a conversion goal and this calculator runs the paid-media funnel backwards to the money. It divides your goal by your…
- Amazon ACoS & TACoS CalculatorAmazon Ads reporting definitionsEnter your ad spend and your ad-attributed sales and this calculator returns your ACoS — advertising cost of sale — together…
- Amazon FBA Profit CalculatorSelling on Amazon fee schedule (US)This calculator turns an Amazon listing into the only three numbers that matter before you place a purchase order: net profit…
- ARPU / ARPA CalculatorSEC key-performance-indicator disclosure guidanceThis calculator produces the three revenue-per-user figures that get confused for one another: ARPU, which divides period…
- ARR Calculator (Annual Recurring Revenue)Non-GAAP operating metric (ASC 606 / IFRS 15 govern recognised revenue)Annual recurring revenue is the annualised value of the subscriptions you hold under contract right now. This calculator builds…
- Average Order Value (AOV) CalculatorMarketing Metrics (Farris et al.) definitionsAverage order value is revenue divided by orders — but the useful part is what you do with it. Enter your period revenue, order…
Accounting & Financial Statement Analysis 5 calculators
- Accounting Equation CalculatorFASB Concepts Statement 8, Ch. 4Enter any two of the three balance-sheet totals and this calculator returns the third, then proves the answer against the…
- Accounts Receivable Turnover CalculatorUS GAAP statements (ASC 310) · 365-day yearReceivables turnover tells you how many times a year you sell on credit, collect the cash, and lend it out again. Enter net…
- Accruals Ratio CalculatorSloan (1996); Richardson, Sloan, Soliman & Tuna (2005)Reported profit is cash flow plus accruals, and accruals are estimates. The accruals ratio measures how much of a year's…
- Allowance for Doubtful Accounts CalculatorFASB ASC 326 (CECL) / IFRS 9Enter your receivables aging and the loss rate you expect from each bucket, and this calculator returns the allowance balance…
- Altman Z-Score CalculatorAltman (1968, 1983, 1995) Z-Score modelsThe Altman Z-Score turns five balance-sheet and income-statement ratios into one number that says how closely a company…
HVAC, Refrigeration & Building Science 4 calculators
- Air Changes Per Hour (ACH) CalculatorASHRAE 62.1 / 62.2 ventilationAir changes per hour is airflow expressed as multiples of the room's own volume: 6 ACH means the fan moves six times the room's…
- Air Conditioner BTU & Tonnage CalculatorAHAM / ENERGY STAR room AC sizing methodEnter the room's floor area and this calculator returns the cooling capacity it needs in BTU per hour and in tons, using the…
- Air Conditioner Running Cost CalculatorAHRI 210/240 and DOE 10 CFR 430 Appendix M1 ratingsThis calculator separates the two questions people ask about cooling cost and answers both. What does it cost while it is…
- Available Static Pressure & Friction Rate CalculatorACCA Manual D friction rate procedureA blower produces a fixed amount of static pressure at its design airflow, and the filter, coil, humidifier, grilles and…
Insurance & Risk Management 4 calculators
- Actual Cash Value (ACV) CalculatorStraight-line depreciation, ACV and RCV settlement provisionsActual cash value is replacement cost minus depreciation, and depreciation is what turns a $12,000 roof into a $6,240 check…
- Actuarial Credibility Weighting CalculatorLimited fluctuation (classical) credibilityAn account with three claims does not tell you much; the same account with three thousand tells you a great deal. Credibility…
- Auto Insurance Deductible Break-Even CalculatorExpected-cost comparison of retained riskRaising a deductible is a trade of a certain small saving against an uncertain larger cost. Two numbers settle it. The…
- Auto Liability Coverage Limit CalculatorCCPA Title III garnishment cap (15 U.S.C. §1673)Liability limits are not sized against the car you drive. They are sized against what a plaintiff could collect from you if a…
Aviation, Aerospace & Marine 3 calculators
- Aircraft Weight & Balance CalculatorFAA-H-8083-1BEnter the weight and arm of every station on your aircraft and this calculator returns the loaded weight, the total moment and…
- Anchor Rode & Scope CalculatorScope measured from bow roller to seabedScope is the ratio of rode deployed to the vertical distance from your bow roller down to the seabed — and that vertical…
- Aviation Fuel Burn & Reserve Calculator14 CFR 91.151 / 91.167 fuel reservesThis calculator builds a complete fuel plan for one leg. Enter your cruise fuel flow, the distance and expected ground speed…
Biology, Genetics & Clinical Lab 3 calculators
- Allele Frequency CalculatorDirect gene counting; Wright's fixation index F-ISEnter how many individuals in your sample carry each of the three genotypes and this calculator counts alleles directly: it…
- Anion Gap CalculatorSerum anion gap with Figge albumin correctionEnter a basic metabolic panel and this calculator returns the serum anion gap, the albumin-corrected gap, the delta gap, the…
- Autosomal Recessive Carrier Risk CalculatorMendelian inheritance with Bayesian residual risk after screeningGive each prospective parent a carrier probability — a population figure, a pedigree-derived number, or 100% for a confirmed…
Calculus, Linear Algebra & Discrete Math 3 calculators
- Angle Between Two Vectors CalculatorDot product identity a·b = |a||b|cos θEnter the components of two vectors and this calculator returns the angle between them in both degrees and radians, along with…
- Arc Length of a Curve Calculator (Integral Form)Arc-length integral; composite Simpson quadratureGive this calculator a curve — explicitly as y = f(x) , parametrically as x(t) and y(t) , or in polar form as r(θ) — together…
- Area Between Curves CalculatorA = ∫ |f(x) − g(x)| dx, split at each intersectionEnter two functions and this calculator finds every point where they cross inside your search window, integrates the gap…
Education, Grading & Test Scores 3 calculators
- ACT Composite Score CalculatorACT scoring: composite as the rounded mean of section scaled scoresEnter your scaled ACT section scores and this calculator returns the composite exactly the way ACT computes it: the arithmetic…
- AP Exam Score CalculatorCollege Board AP composite scoring modelThis calculator rebuilds an AP exam score the way the College Board does it: it converts your multiple-choice and free-response…
- Attendance Percentage CalculatorInstitutional minimum-attendance rule (course or programme policy)Enter the classes you have attended and the classes held so far and this calculator returns your attendance percentage, how…
Electrical Trade & Electronics 3 calculators
- Appliance Electricity Cost CalculatorkWh = W × h ÷ 1000Enter an appliance's power in watts (or its amps and volts), how long you run it, and what you pay per kilowatt-hour. You get…
- Available Short Circuit Current CalculatorPoint-to-point method (Bussmann/IEEE 241); NEC 110.9, 110.24Every breaker and fuse carries two current ratings: the trip rating, which says when it opens, and the interrupting rating…
- AWG to mm² Wire Size Conversion CalculatorASTM B258 AWG definitionPick an AWG size and this calculator gives its exact diameter in millimetres and inches, its cross-sectional area in mm², its…
Agriculture, Livestock & Landscaping 2 calculators
- Acres per Spray Tank & Field Coverage CalculatorASABE EP496 / D497 machinery management methodTwo numbers decide how a spray day goes: how much ground a tankful covers, and how much ground the boom covers in an hour. This…
- Agricultural Lime Requirement CalculatorECCE basis under state agricultural liming materials lawA soil test reports a lime requirement in pounds of pure calcium carbonate per acre, and the quarry sells you a damp, variably…
Arithmetic, Algebra & Number Theory 2 calculators
- Adding & Subtracting Fractions CalculatorEnter two fractions or mixed numbers and this calculator adds or subtracts them exactly — no rounding, no decimal drift. It…
- Arithmetic Sequence CalculatorGive this calculator a first term and either the common difference or any other term of the sequence, and it returns the nth…
Automotive, Diesel & Motorsports 2 calculators
- Air Fuel Ratio & Lambda CalculatorStoichiometric mass air-fuel ratios by fuelAir-fuel ratio only means something once you know which fuel it refers to. 12.5:1 is rich on gasoline, dangerously lean on E85…
- Axle Gear Ratio & Final Drive CalculatorRing-and-pinion ratio identityEnter the tooth counts stamped on your ring gear and pinion and this calculator returns the axle ratio, the overall drive ratio…
Chemistry & Chemical Engineering 2 calculators
- Acid-Base Titration CalculatorStoichiometric equivalence, MₐVₐnₐ = M_bV_bn_bA titration converts a burette reading into a concentration. At the equivalence point the moles of titratable protons supplied…
- Arrhenius Equation CalculatorArrhenius equation, k = A·exp(−Ea/RT), R = 8.314463 J/(mol·K)The Arrhenius equation says a rate constant rises exponentially with temperature: k = A·e^(−Ea/RT). Enter the pre-exponential…
Computing, IT, Networking & Security 2 calculators
- Amdahl's Law Speedup CalculatorAmdahl (1967) and Gustafson (1988)Enter the fraction of your program that can run in parallel and the number of processors you plan to throw at it, and this…
- Aspect Ratio CalculatorITU-R BT.709 / BT.2020 image formatsLock an aspect ratio, give one dimension, and this calculator returns the other one exactly. It also reduces any resolution to…
Everyday Life & Household 2 calculators
- Airline Points & Miles Value Calculator (Cents Per Point)Cents-per-point (cpp) redemption valuationPoints are only worth what a specific redemption saves you in cash, and the number that measures it is cents per point : the…
- Appliance Repair vs Replace CalculatorAnnualised cost of ownership comparisonA repair quote and a new-appliance price are not comparable numbers, because they buy different lengths of service. This…
Industrial, Logistics & Plant Operations 2 calculators
- Air Compressor CFM Requirement CalculatorSCFM referenced to 14.696 psia, 68 °FThis calculator sizes an air compressor the way a plant engineer does: it time-averages each tool's rated consumption by its…
- API Gravity Calculator (Specific Gravity, lb/gal & bbl per Ton)API MPMS Chapter 11.1 volume correction; API gravity defined at 60/60 °FAPI gravity is an inverted density scale built so that heavier oil gets a lower number and 10 °API is exactly the density of…
Personal Finance, Loans & Credit 2 calculators
- Auto Lease Payment CalculatorRegulation M (Consumer Leasing Act)Every dealer lease payment is two numbers added together: a depreciation charge that pays for the value the car loses while you…
- Auto Loan Payment CalculatorAmortised loan formula; Regulation Z finance-charge disclosureThe payment a dealer quotes is built from more than the sticker price. Sales tax, documentation and registration fees, and any…
Time, Date, Navigation & Astronomy 2 calculators
- Add & Subtract Time CalculatorSexagesimal (base-60) duration arithmeticAdd or subtract up to three durations written as hours, minutes and seconds, and get the answer in h:m:s, in decimal hours, in…
- Age in Days, Hours & Minutes CalculatorFliegel–Van Flandern Julian Day NumberEnter a date of birth and this calculator returns the exact elapsed time to any reference date: total days, weeks, hours…