MARTINDALE'S
CALCULATORS ONLINE CENTER PART I: AE AUTOMOBILE, TRUCK, MOTORCYCLE, LOCOMOTIVE, STEAMBOAT (Calculators, Applets, Spreadsheets, and where Applicable includes: Courses, Manuals, Handbooks, Simulations, Animations, Videos, etc.) 
FUEL ECONOMY GUIDE + CALCULATORS  Fueleconomy.gov, Energy Efficiency and Renewable Energy Network (EREN), U.S. Department of Energy VERY VERY VERY...EXTENSIVE. Fuel Economy Calculators
NEW CAR CALCULATORS & APPLETS  USED CAR CALCULATORS & APPLETS
NEW & USED CAR PRICE COMPARISON CALCULATORS & APPLETS KELLY BLUE BOOK  Kelly Blue Book VERY VERY VERY...EXTENSIVE. New & Used Cars. Kelly Blue Book
Indicate the Engine,Transmission, Equipment & Mileage; Enter Zipcode..." EDMUND'S AUTOMOBILE BUYER'S GUIDES  Edmunds.com, Inc. VERY VERY VERY...EXTENSIVE. CALCULATORS FOR NEW & USED CAR PRICING. "...Consumer Advice Since 1966..." NEW CARS, MOTORCYCLES & TRUCKS
SEE CARS, MOTORCYCLES & TRUCKS CENTER (BY COMPANY) Safety, Defects & Recalls
DEFECT CALCULATORS, APPLETS & DATABASES DEFECTS & RECALLS  Office of Defects Investigations (ODI), National Highway Traffic Safety Administration VERY VERY VERY...EXTENSIVE. Office of Defects Investigations (ODI)
MANUFACTURERS RECALL SEARCH BY VIN PAGES  National Highway Traffic Safety Administration (NHTSA), Department of Transporation Manufacturers recall search by VIN pages (by Light vehicle manufacturers: Ford, GM, etc. & Motorcycle manufacturers)
"...After entering the VIN number into the field, results will appear if the consumer has an open recall on their vehicle, and if there are none, owners will see "No Open Recalls."..." VEHICLE HISTORY REPORTS  PAST ACCIDENTS, ETC.
CARFAX
Accidents  Crash Investigations
CAR CRASH PERFORMANCE CALCULATORS, APPLETS, ANIMATIONS & SIMULATIONS CRASH WORTHINESS CALCULATORS, APPLETS, ANIMATIONS & SIMULATIONS REPAIR COST CALCULATORS, APPLETS, ANIMATIONS & SIMULATIONS CAR CRASH PERFORMANCE TOOL  Insurance News Network, LLC VERY VERY VERY...EXTENSIVE. Car Crash Performance Tool allows you to

CALCULATION OF ROAD TRAFFIC NOISE  CALCULATORS  National Physical Laboratory (NPL), U.K. VERY EXTENSIVE. Road Traffic Noise
Speed; Heavy Vehicles Percentage; Gradient; Road Surface; etc..."
Barrier Dimensions; etc..."
Total angle of reflective surfaces (opposite)..." ROAD TRAFFIC NOISE CALCULATOR  Rigolett, The Netherlands VERY EXTENSIVE. Road Traffic Noise Calculator
View Angle; Fraction Sound Absorbing Soil; etc...." Measurement & Torque
EXAMPLES INCLUDE UNITS OF MEASURE CALCULATORS  AUTO/TRUCK ETC.  DieselNet, ECOpoint Inc. Unit Conversion Calculators include:
Pressure; Energy; Power; Velocity; Flow Rate; Temperature; Fuel Consumption; etc..." Sulfate Particulates..." TORQUE CALCULATORS, APPLETS, ANIMATIONS & SIMULATIONS
Bolt Torque Calculator INPUT Values include:
Mating Thread Data Length; Mating Thread Data Material
Applied Load & K Factor..." TORQUE TENSION CALCULATOR (JAVA APPLET)  Norbar Torque Tools Ltd., Oxfordshire, U.K. VERY VERY EXTENSIVE. Torque Tension Calculator
"...The default friction values are suitable for non lubricated steel bolts. The calculated values (at the top of the calculator, in red) are the maximum recommended values, based on 90% of yield. If you want to know the torque needed to generate a lower load, vary the Yield parameter until the desired load appears..."
Root Diameter; Hex A/F..."
TIGHTING TORQUE TO PRELOAD A BOLT  Anton van Beek, Tribology/Machine Reliability and Performance, Mechanical Engineering, Faculty OCP, Delft University of Technology, The Netherlands VERY VERY EXTENSIVE. Tighting Torque to Preload A Bolt Calculator INPUT Values include:
Head Coefficient of Friction..."
Tensile Stress Area; Ultimate Tensile Strength; Yield Strength; Tensile Stress; Torsional Stress; Equivalent Stress; Thread Friction; Head Face Friction; Total Tightening Torque; etc..." TORQUE WRENCH EXTENSION CALCULATOR (JAVA APPLET)  Norbar Torque Tools Ltd., Oxfordshire, U.K. VERY EXTENSIVE. "...When you put an extension on a torque wrench, like a crow foot or a dog bone, the torque applied to the fastener increases..." Torque Wrench Extension Calculator INPUT Values include:

ACCELERATION CALCULATORS, APPLETS, ANIMATIONS & SIMULATIONS PHYSICS OF RACING COURSES & LESSONS BUILDING SPEED: PHYSICS OF NASCAR, RACING, TRACKS, RACING TEAMS, ETC.  Diandra LesliePelecky, Author of "The Physics of NASCAR" Multiemdia Physics of NASCAR, Racing, Tracks, Racing Teams, etc. (Text, Images, Videos/Movies & Audio/Sound). VERY VERY VERY...EXTENSIVE. Examples of "Physics of NASCAR, Racing, etc." Lessons, Technical Reports, etc. Sections & Subsections include
Turning, GForces & Banked Tracks; Center of Gravity; Centripetal Accleration; Centripetal Force; Friction; Pressure; etc...." Engines; Materials; Tracks; etc. THE SCIENCE OF SPEED  Written and Hosted by Diandra LesliePelecky; Produced for the National Science Foundation (NSF) Multimedia The Science of Speed (Text, Images, Videos/Movies & Audio/Sound). VERY VERY VERY...EXTENSIVE. The Science of Speed
"...This video series uses the elements of NASCAR to show that a racecar really is a science experiment on wheels..."
Friction & Heat Video; Grip Video; Tires & Pressure Video (NASCAR tires don't have "air pressure" because they're filled with nitrogen); Turning Video; Power Video; Balance Video; etc..." THE PHYSICS OF MOTORSPORT  R.G. Brower, Department of Physics, University of Durham, U.K. Multimedia Physics of Motorsport Course (Text & Images). Physics of Motorsport Course
The Straights; The Racing Line; Skids and Why they Happen; etc..." PHYSICS OF RACING  Articles written by: Brian Beckman (1991); Converted to HYML by Robert Keller; Hosted by: Miata.net, a service of Eunos Communications LLC. Multimedia Physics of Auto Racing Course (Text & Images). Examples from over "23" "Physics of Racing" Course Chapters include
Keeping Your Tires Stuck to the Ground; Basic Calculations; There Is No Such Thing as Centrifugal Force; Introduction to the Racing Line; Speed and Horsepower; The Traction Budget; Simulating Car Dynamics with a Computer Program; Straights; etc..." SPEED CALCULATORS, APPLETS, ANIMATIONS & SIMULATIONS
MOTION WITH CONSTANT ACCELERATION (JAVA APPLET)  W. Fendt, Augsburg, Bundesrepublik Deutschland (Germany) Motion with Constant Acceleration Calculator
"...you can vary the values of initial position, initital velocity and acceleration..." Automotive Design & Development
Buckling Calculation and Plotting Programme Clutches, with Torque Transmitted by Clutch Calculator Interactive Bolt Design Program  Java Applet Fatigue Calculation Programme  using the Goodman criterion  Java Applet Spring Calculation and Plotting Programme  Java Applet Examples of "Vehicles and Fuels Research Data, Models, and Tools" include
FASTSim (Future Automotive Systems Technology Simulator); Fleet DNA (Commercial Fleet Vehicle Operating Data); etc..." MODELING & SIMULATION  Argonne Transportation Technology R&D Center, Argonne National Laboratory VERY VERY VERY...EXTENSIVE. Examples of Transportation Technology Modeling & Simulation Software include
The VISION Model

DIESEL ENGINE AND THE DIESEL CYCLE (JAVA APPLETS)  Xing Min (Sherman) Wang, Sherman Visual Lab "...Diesel Engine Calculator & Diesel Cycle Calculator..." For more information see Welcome to Sherman Physics Lab or Sherman Visual Lab Electric Engines & Hybrid Cars
Hybrid GasElectric Car  Cas Calculator
ELECTRIC MOTOR CALCULATORS, APPLETS, ANIMATIONS & SIMULATIONS
4QD MOTOR CURRENT CALCULATOR  R. Torrens, 4QD, U.K. VERY EXTENSIVE. Motor Current Calculator
ELECTRIC VEHICLE ROAD SPEED CALCULATORS & APPLETS
Road Speed Calculator INPUT Values include:
Overall Reduction Gear Ratio; Road Wheel Diameter..." 
VEHICLES AND FUELS RESEARCH DATA, MODELS, AND TOOLS  Vehicles and Fuels Research, National Renewable Energy Laboratory (NREL) VERY VERY VERY...EXTENSIVE. Examples of "Vehicles and Fuels Research Data, Models, and Tools" include
FASTSim (Future Automotive Systems Technology Simulator); Fleet DNA (Commercial Fleet Vehicle Operating Data); etc..." INTERNAL COMBUSTION ENGINE CALCULATORS, APPLETS, ANIMATIONS & SIMULATIONS
FOURSTROKE CYCLE (JAVA APPLET)  Author: R. Moros, Institut für Technische Chemie, Bundesrepublik Deutschland (Germany) VERY EXTENSIVE. FourStroke Cycle Calculator Illustrates

Remote users can control
INTERNAL COMBUSTION ENGINE CALCULATORS, APPLETS, ANIMATIONS & SIMULATIONS
INTERNAL COMBUSTION ENGINE FLUID MECHANICS ONLINE  B. Willson & G. Hutcherson, Engines & Energy Conversion Laboratory (EELC), Department of Mechanical Engineering, College of Engineering, Colorado State University VERY VERY VERY...EXTENSIVE. Multimedia Course with Applets (Text & Images). Internal Combustion Engine Fluid Mechanics Calculators Categories include:
INTERNAL COMBUSTION ENGINE CALCULATORS, APPLETS, ANIMATIONS & SIMULATIONS
INTERNAL COMBUSTION ENGINE HEAT TRANSFER ONLINE  B. Willson & G. Hutcherson, Engines & Energy Conversion Laboratory (EELC), Department of Mechanical Engineering, College of Engineering, Colorado State University VERY VERY VERY...EXTENSIVE. Multimedia Course with Applets (Text & Images). Internal Combustion Engine Heat Transfer Calculators Categories include:
Review of Conduction, Convection, and Radiation; Resistance Modeling..."
Instantaneous Heat Transfer Coefficients; Intake and Exhaust System Heat Transfer; etc..." Heat Transfer in the Piston and Cylinder (Cylinder Heat Transfer Processes; etc.)..."
INTERNAL COMBUSTION ENGINE CALCULATORS, APPLETS, ANIMATIONS & SIMULATIONS
INTERNAL COMBUSTION ENGINE THERMODYNAMIC OUTLINE  B. Willson & G. Hutcherson, Engines & Energy Conversion Laboratory (EELC), Department of Mechanical Engineering, College of Engineering, Colorado State University Multimedia Course with Applets (Text & Images). VERY VERY VERY...EXTENSIVE. Internal Combustion Engine Thermodynamics Calculators Categories include:
Finite Heat Release Otto Cycle; Finite Heat Release Otto Cycle with Heat Transfer..."

SIMPLE PERFORMANCE PREDICTION METHOD FOR STIRLING ENGINE (CALCULATOR)  K. Hirata, Ship Research Institute, Ministry of Transport, Japan VERY EXTENSIVE. Stirling Engine Calculator
Swept volume of expansion space; Gas temperature of expansion space; Gas temperature of compression space; Working gas; etc..." STIRLING ENGINE CALCULATORS, APPLETS, ANIMATIONS & SIMULATIONS
Stirling Engine Animation illustrates
Steam Engine Design
STEAM ENGINE CALCULATORS, APPLETS, ANIMATIONS & SIMULATIONS
STEAM LOCOMOTIVE ENGINE (ANIMATIONS)  Animated Engines, Matt Keveney VERY EXTENSIVE. Steam Locomotive Engine Animations include:
Coomber; Crank Substitute; Revolving Cylinder; Watt Beam; Grasshopper Beam; etc..."
Examples of Steam Engines include
Trevithick High Pressure Engine; Boulton & Watt BellCrank Engine; etc..." RANKINE CYCLE CALCULATORS, APPLETS, LESSONS, ETC.
Organic Rankine Cycle Calculator
Steam Engine  Auto
World's Smallest Microsteam Engine

STEAM LOCOMOTIVE DESIGNER  W. Barris, Steam Locomotive VERY VERY EXTENSIVE. Steam Locomotive Designer (Steam Locomotive Calculator)
LOCOMOTIVE STEAM ENGINE CALCULATORS, APPLETS, ANIMATIONS & SIMULATIONS
In a Steam Locomotive Engine
Steam from the boiler enters the steam chest and is admitted to the front end of the cylinder..." Steam Engine  Steamboats
HEAT ENGINES OF PHYSICS: STEAM ENGINES  Big Chem Multimedia Steam Engine Lessons (Text, Images & Simulations). For more information see Big Chem Fire Engine Design
WILDLAND ENGINE DESIGN CALCULATORS & TECHNICAL REPORTS  Roscommon Equipment Center (REC), Forest Fire Experiment Station, Roscommon, MI VERY VERY EXTENSIVE. Examples of "Wildland Engine Design" Technical Reports include
SlipOn Water Tank Units; etc..."

Motorcycle Calculators, Simulations & Technology Designs include:
Harley Displacement Calculator; S&S Manifold Length Calculator; Intercooler Calculators; Professional Injector Pulsewidth Calculator; Additional Injector Controller Calculator; Boost Compression Ratio Calculator; Harley Advanced Dynamic Compression Calculator; Turbocharger and Supercharger Maps; HarleyDavidson Exhaust Technology; etc..."
Gearing Commander
Suzuki; Triumph; Yamaha; etc..."
Primary Drive Ratio; Speed in Km/h depending on Gear and RPM; RPM variation due to sprocket changes; Chain geometry changes due to sprocket & chain changes; etc... MOTORCYCLE WHEELY (JAVA APPLET)  HAMLET, A. James Clark School of Engineering, University of Maryland Motorcycle Wheely Calculator analyzes
GOKARTS CALCULATORS, APPLETS, ANIMATIONS & SIMULATIONS
MOTOR SCOOTERS CALCULATORS, APPLETS, ANIMATIONS & SIMULATIONS
2 STROKE OIL MIXING CALCULATOR  Scooter Help Motor Scooter Calculator  2 Stroke Oil Mixing Calculator
Farm Tractors  Farm Machinery
TRACTOR CALCULATORS, APPLETS, ANIMATIONS & SIMULATIONS TRACTOR ENGINE CALCULATORS, APPLETS, ANIMATIONS & SIMULATIONS TRACTOR HEATER TIMERS CALCULATOR  Wisconsin Public Service Tractor Heater Timers Calculator

Cams & Pistons
Piston Simulation
Car Stereo  Car Audio Design
CAR AUDIO DESIGN  CarStereo.com, Online ConneXions Inc. Multimedia Car Audio Design Calculators & Lessons (Text & Images). VERY VERY VERY...EXTENSIVE. Examples of "Car Audio Design" Subject Categories include
Amplifiers Lessons; Basic Electrical Lessons; Car Audio Basics Lessons; Crossovers & Filter Lessons; Equalizers Lessons; Installation and Wiring Lessons; etc..."
Box Dimensions Calculator & Solid Object Volume Calculator; SixthOrder Bandpass Subwoofer Enclosure Design Calculator; Vent Dimensions Calculator; Sealed Subwoofer Box Design Calculator  Sealed Speaker Enclosure Design Calculator; Subwoofer Box Dimension Calculator; etc..."
Ohm's Law Calculator (Impedance/Resistance)  Impedance/Resistance Calculations; etc..."
6th Order LinkwitzRiley Crossover Network Design Formulas & Calculator; 4th Order LinkwitzRiley Crossover Network Design Formulas & Calculator; Butterworth 2nd Order Crossover Network Design Formulas & Calculator; etc..."
CAR RADIO: SUBWOOFER ENCLOSURE CALCULATORS  the12volt.com VERY VERY EXTENSIVE. Car Radio: Subwoofer Enclosure Calculators include
Parallel Calculator; Series Calculator; Port Length Calculator; Volume Calculator  Rectangular/Square Enclosures; Volume Calculator  Wedge Enclosures 1; Volume Calculator  Wedge Enclosures 2; Volume Calculator  Tube/Cylinder Enclosures..." CAR RADIO: PASSIVE CROSSOVERS/CAPACITOR & COIL CALCULATOR  the12volt.com VERY VERY EXTENSIVE. For more information see Car Stereo, Mobile Video, Navigation or The 12Volt.com (Alarm, Stereo & Cruise Control Info for Installers)
Drag & Speedway Racing
DRAG RACING CALCULATOR  Ray Hall Turbocharging, Cairns, Queensland, Australia Drag Racing Calculators include
Differential Ratio Calculator..." Emissions
CARBON DIOXIDE EMISSIONS CALCULATORS, APPLETS, ANIMATIONS & SIMULATIONS NITROGEN OXIDE EMISSIONS CALCULATORS, APPLETS, ANIMATIONS & SIMULATIONS CALCULATE CARBON FOOTPRINT CALCULATOR  TerraPass Inc. VERY VERY VERY...EXTENSIVE. Carbon Footprint Calculators
SMOKE SOOT DENSITY CALCULATORS, APPLETS, ANIMATIONS & SIMULATIONS
Smoke Density Calculator
SULFATE PARTICULATE EMISSIONS CALCULATORS & APPLETS
Sulfate Particulates Calculator
Horsepower, Chassis, Compression, Grears, Etc.
COMPRESSION CALCULATORS & APPLETS, ETC... AUTOMOTIVE CALCULATIONS  B.A. Bowling & A.C. Grippo VERY VERY VERY...EXTENSIVE. "...edicated to providing you with useful applications for all aspects of automotive engineering and design..." Automotive Calculators include:
Ignition Circuit Calculator; Aerodynamic and Rolling HP Loss Calculator; Compression Ratio Calculator; MilesPerGallon Estimation Calculator; Speedometer Gear Calibration Calculator; RPM & MPH Correlation Calculator; Best Differential Gear Calculator; Best Header Calculator; Battery ColdCranking Amp Estimation Calculator; Battery ColdCranking Amp Temperature Adjustment Calculator; Compression Ratio Influence Calculator; Engine Displacement Calculator; Driveshaft Velocity Calculator; Roadway Vehicle Dynamometer Calculator; ET and MPH Environmental Correction Calculator; Cylinder Head Flow Correction Calculator; Holley Carburetor Jet Calculator; Intake Runner Harmonic Pulse Prediction Calculator; Fuel Injector Sizing Calculator; Rough Engine Horsepower Estimation Calculator; RPM Range Calculator; Optimum Shifter Calculator..." AUTOMOTIVE PERFORMANCE CALCULATORS  S. Weiss, World Wide Enterprises VERY VERY VERY...EXTENSIVE. Examples of Automotive Performance Calculators include:
Calculate Engine Size in Cubic Inches and CC's also Bore/Stroke Ratio and Rod/Stroke Ratio; Calculate Engine's Compression Ratio (CR) or Total Volume Or Combustion Chamber Volume; Calculate Change in Fuel Injector Flow from change in Fuel Pressure; Calculate Size of Carburetor Needed in CFM; Convert Airflow to a different Depression; Estimate Horsepower from Intake Airflow; Estimate Intake Airflow needed from Horse Power wanted; Calculate Density Altitude and Dew Temperature (Point); Estimate 1/8 Mile Horsepower Requirements from MPH; Estimate 1/8 Mile Horsepower Requirements from ET; etc... CHASSIS AND ENGINE CALCULATORS  The Dirt Forum Multimedia Chassis & Engine Calculators & Videos (Text, Images, Videos/Movies & Audio/Sound). VERY VERY VERY...EXTENSIVE. The Dirt Forum Tool Box includes:
Engine Calculators, Baseline Chassis Setup Sheets; Chassis Videos; etc..."
Dyno Calculator
Gear Ratio Calculator
Borg Wagner; Muncie; etc..."
Crawl Speed at Given RPM in Feet Per Minute for up to 6 Gears & Reverse; Road Speed at Given RPM in Miles Per Hour for up to 6 Gears & Reverse; Road RPMs at Given Speed for up to 6 Gears & Reverse..." 
Tire & Wheels
BRIDGESTONE/FIRESTONE TIRE SELECTOR  BridgestoneFirestone Multimedia BridgestoneFirestone Tire Selector (Text & Images). VERY VERY VERY...EXTENSIVE. For more information see BridgestoneFirestone GOODYEAR TIRE SELECTOR  Goodyear Tire & Rubber Multimedia Goodyear Tire & Rubber Tire Selector (Text & Images). VERY VERY VERY...EXTENSIVE. For more information see Goodyear Tire & Rubber MICHELIN TIRE SELECTOR  Michelin Multimedia Michelin Tire Selector (Text & Images). VERY VERY VERY...EXTENSIVE. PERELLI TIRE SELECTOR  Pirelli, Italy Multimedia Pirelli Tire Selector (Text & Images). VERY VERY VERY...EXTENSIVE. For more information see Pirelli YOKOHAMA CAR TIRE SELECTOR CALCULATOR  The Yokohama Tire Store Multimedia Yokohama Tire Selector (Text & Images). VERY VERY VERY...EXTENSIVE. TIRE SIZE CALCULATORS & APPLETS
Tire Size Calculator
TIRE SIZE CALCULATOR  Maintained by T. Day, Club DSM Tire Size Calculator
TIRE AND WHEEL UPGRADE CALCULATOR  Created: by M. Sink; Hosted by: the International MR2 Owners Club For more information see Tire Information or the International MR2 Owners Club TIRE AND WHEEL UPGRADE CALCULATOR  M. Sink VERY EXTENSIVE. Tire and Wheel Upgrade Calculator INPUT Values include:
Current Aspect Ratio; Current Wheel Size; Widest Tire Desired; Largest Wheel Size Desired; Acceptable +/ Speedometer Error (MPH)..." Towing
TRAVEL TRAILER WEIGHT CALCULATOR  Changin' Gears VERY EXTENSIVE. Travel Trailer Weight Calculator INPUT Values include
Gross Combination Weight Rating; Tow vehicle maximum loaded trailer weight rating; etc..." Turbocharging
"...Turbocharger specialists in the Automotive, Industrial, Agricultural & Marine Turbochargers..." Turbocharging Calculators include
Engine Compression Ratio or Combustion Chamber Volume Calculator; Engine Compression Ratio under Turbo Boost Calculator; Find a Suitable Turbocharger for a Engine; etc..."
Fuel: Costs & MPG
FUEL CONSUMPTION CALCULATORS, APPLETS, ANIMATIONS & SIMULATIONS FUEL ECONOMY GUIDE + CALCULATORS  Energy Efficiency and Renewable Energy Network (EREN), U.S. Department of Energy VERY VERY EXTENSIVE. "...Compares all models and makes from 1985 to the Present & Compare SidebySide; Search by Class; Search by MPG; Best & Worst MPG; etc..." Fuel Economy Guide include:
Output Values: MPG (City & Highway); Annual Fuel Costs; Greenhouse Gas Emissions; Air Polutiong Score..." MILES PER GALLON CALCULATORS & APPLETS
Fuel Consuption Calculator INPUT Values include:
Calculate amount of fuel from fuel consumption and distance in Liters, Imperial or U.S. Gallons; Calculate distance from fuel consumption and amount of fuel, etc..." FUEL CONSUMPTION CALCULATOR  F. Tapson & Cleave Books, Centre for Innovation in Mathematics Teaching, University of Exeter, U.K. Multimedia Fuel Consumption Calculator (Text & Images). For more information see Specialist Calculators; Cleave Books or the Centre for Innovation in Mathematics Teaching MILES PER GALLON CALCULATOR  D.C. Peterson Miles Per Gallon Calculator
Lease, Loans, Finance & Taxes
CAR COST COMPARISON CALCULATORS & APPLETS
Car Cost Comparison Calculator
FINANCING CALCULATORS & APPLETS
FORD MOTOR COMPANY: LEASE VS FINANCE CALCULATOR  Ford Motor Co. VERY EXENTSIVE. Automobile Lease vs. Finance Calculator

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