Comparison

Ultra Measure Master vs Unit Eater

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Ultra Measure Master

This professional conversion calculator offers over 400 standard and metric unit conversions for linear, area, and volume measurements. It's ideal for professionals needing quick and accurate calculations in various dimensional formats, including feet-inch-fractions and decimal units.

Highlights
  • Over 400 conversion combinations
  • 60+ standard and metric units
  • Converts between feet-inch-fractions, decimal feet/inches, and metric
  • Calculates linear, area, and volume
  • Includes weight, velocity, flow rate, pressure, and temperature conversions
  • Built-in User's Guide with key-specific help
Features
Read full description

Professional Grade U.S. Standard to Metric Conversion Calculator by Calculated Industries The Ultra Measure Master® app from Calculated Industries gives you the power to solve metric and standard unit conversions on your iPhone and iPad. And while perhaps obvious, if you change from an iOS device to a non-iOS device, you WILL need to buy a new license as they are incompatible. Forget complex scientific calculators, memorizing conversion formulas or using tables — instantly calculate with more than 400 conversion combinations using 60 built-in standard and metric units. The Ultra Measure Master is especially helpful for those working in federal DOT environments where frequent metric to foot-inch conversions and “dual unit” reporting is required -- and includes a full User’s Guide built in as well as the ability to press and hold a key for specific help! Ideal for Engineers, Architects, Designers, Contractors/Builders, Draftspersons, Excavation/Highway Contractors, Scientists, Pharmaceutical Lab Techs, Purchasing, Importers/Exporters, Students (or anyone who needs fast, easy, professional unit conversions). • Work in and convert between all building dimensional formats: feet-inch-fractions, inch fraction, yards, decimal feet (10ths, 100ths), decimal inches and metric (m, cm, mm) • Easily calculate linear, area and volume measurements • Find dry and liquid weight per volume • Solve for velocity, flow rate, pressure, temperatures Created by Calculated Industries, the originator of the award-winning Construction Master® calculators. FEATURES: Dimensional Math and Conversions • More than 60 Standard and Metric (SI) units built-in • Over 400 conversion combinations • Works in and converts between • Feet-Inch-Fraction • Inch Fraction • Yards • Decimal Feet (10ths, 100ths), Decimal Inches • Full Metric (m, cm, mm) Dedicated Functions Help You Measure and Calculate: • Linear • Feet-Inch-Fractions • Yards, Miles • Decimal Feet/Inch • Millimeters, Centimeters, Meters and Kilometers • Area • Feet, Inch, Yards, Acres, Miles • Millimeters, Centimeters, Meters, Hectares and Kilometers • Volume • Feet, Inch, Yards, Miles • Millimeters, Centimeters, Meters, Kilometers • Gallons, Liters, Fluid Ounces • Acre-Feet and Board Feet • Weight • Pounds, Dry Ounces, Tons • Metric Tons, Grams and Kilograms • Weight per Volume • Tons per Cubic Yard • Pounds per Cubic Yard • Kilograms per Cubic Meter • Linear Velocity • Inches per Second • Feet per Second • Feet per Minute • Miles per Hour • Millimeters per Second/Minute • Meters per Second/Minute • Kilometers per Hour • Flow Rate • Ounces per Second • Gallons per Minute • Milliliters per Second • Liters per Second • Pressure • Pounds per Square Inch (PSI) • Pounds per Square Foot (PSF) • Kilopascal, Megapascal and Bars • Bending Moment • Inch-Pounds, Foot-Pounds and Newton-Meters • Temperature • Fahrenheit (°F) and Celsius (°C) Special Functions • Entry Editing Backspace Key – with a swipe of a finger • Cost per Unit: Solve unit cost and pricing • Paperless Tape • Board Feet • Memory function •User-Definable Preferences — set custom options: Fractions, Area, Volume. TRADEMARKS: Ultra Measure Master® and Construction Master® are registered trademarks of Calculated Industries, Inc.

About

Unit Eater

This utility app functions as a powerful calculator that handles unit conversions and calculations. It supports a vast array of predefined units and allows users to define their own, making it ideal for scientific and academic tasks. Features include a calculation history, customizable results, and dark mode.

Highlights
  • Unit conversion and calculation
  • Custom unit definition
  • Extensive unit library
  • Calculation history
  • Customizable result format
  • Dark mode
Read full description

Unique calculator that not only converts units, but can also perform calculations with them. Perfect for school, university, work, or personal use! For math, physics, chemistry, biology, engineering, or any other natural sciences! - Standard calculator functions usable with or without units - Target unit freely definable - Define your own units if you need them - History of recent calculations - Quick transfer of parts or entire calculations from history - ANS function to dynamically use the last result - Customizable result format - Quick search - Quick access to important functions like square or cube - Undo and redo of last steps - Dark mode Boost your productivity, focus on the essentials, and leave conversion errors in the past! Supports many units, prefixes, and constants: * Prefixes: kilo, mega, giga, tera, centi, milli, micro, nano, … * Constants: mass of proton, neutron, electron, Avogadro's constant, electric field constant, gas constant, Planck's constant, … * Angles: radian, degree, degree-minute, degree-second, gradian, turn, steradian, … * Length: meter, mile, inch, foot, yard, nautical mile, chain, furlong, cable length, rod, … * Area: square meter, hectare, acre, are, square kilometer, square inch, square foot, square yard, … * Volume: liter, cubic meter, fluid ounce, gallon, gill, pint, quart, barrel, tablespoon, teaspoon, … * Mass: gram, ton, ounce, pound, carat, grain, … * Time: second, minute, hour, day, year, … * Speed: meter per second, kilometer per hour, miles per hour, knot, speed of light, … * Acceleration: gravitational acceleration, meter per second squared, … * Energy: joule, kilocalorie, erg, watt-hour, electronvolt, … * Power: watt, horsepower, … * Force: Newton, pond, kilopond, tf, ozf, lbf, … * Torque: Newton meter, ozfin, ozfft, lbf*in, … * Frequency: Hertz, revolutions per minute, … * Pressure: pascal, bar, atm, at, Torr, mmHg, osi, ose, psi, psf, … * Viscosity: Poise, Stokes, … * Density: gram per cubic centimeter, kg per cubic meter, … * Radiation: Becquerel, Curie, Rutherford, Roentgen, Gray, Sievert, rem, … * Light: candela, lumen, lux * Electricity: volt, ampere, ohm, coulomb, elementary charge, farad, siemens, … * Magnetism: Weber, Tesla, Henry, … Is your desired unit not listed? You can define any additional units! Privacy Policy: https://www.iubenda.com/privacy-policy/22446614 Terms and Conditions: https://www.iubenda.com/terms-and-conditions/22446614

Screenshots

Ultra Measure Master4 screens
Unit Eater4 screens

Verdict

The call

The clearest difference is price: Unit Eater at Free against Ultra Measure Master's $29.99. Unit Eater also leads on update cadence (every 2 weeks vs every 11 months) and review sentiment (100% vs 88%). Ultra Measure Master's advantage is in-app purchases (none vs 2). On ads and device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Unit Eater is free to download; Ultra Measure Master costs $29.99 up front. Unit Eater sells 2 in-app purchases, starting at $0.99 per month. Ultra Measure Master asks for nothing beyond the download.

UpkeepUpdate frequency

Ultra Measure Master ships an update every 11 months, Unit Eater every 2 weeks. The most recent releases landed on October 8, 2026 and October 16, 2026 respectively.

Scorecard6 real differences · 4 level
Ultra Measure Master versus Unit Eater: the parameters behind the verdict, then further details
ParameterUltra Measure MasterUnit Eater
Price$29.99Free — better
Rating5.0 (8 ratings) — better—
Positive reviews87.5% of reviews100.0% of reviews — better
Number of ratings8 — better—
Update frequencyEvery 11 monthsEvery 2 weeks — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationPaidFree with in-app purchases — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod, Mac — better
Requires iOS15.012.0 — better
Further details — not scored
Size61 MB65 MB
Age rating12+4+
DeveloperCalculated IndustriesTom Leon Schmidt

Customer experience

Ultra Measure Master

All ratings8 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews8 reviews
Positive87.5%
Neutral0.0%
Negative12.5%

Unit Eater

Written reviews2 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Ultra Measure Master

No in-app purchases

2 purchases

Unit Eater

Subscriptions1
  • Premium - Monthly$0.991 Month
One-time1
  • Premium - Pay once$3.99

Questions

Is Ultra Measure Master free?
Ultra Measure Master costs $29.99, with no in-app purchases.
Is Unit Eater free?
Unit Eater is free to download, with in-app purchases available.
Do Ultra Measure Master or Unit Eater have ads?
Neither Ultra Measure Master nor Unit Eater shows ads.
Which is updated more often, Ultra Measure Master or Unit Eater?
Ultra Measure Master ships an update every 11 months, and Unit Eater every 2 weeks. Most recently, Ultra Measure Master was updated on October 8, 2026 and Unit Eater on October 16, 2026.

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