Frank Harr’s Conversion App is a powerful unit conversion app built for Engineers, Scientists, Researchers, and anyone who simply enjoys measuring things with accuracy and flexibility. Designed as a professional-grade measurement conversion tool, it serves as a dependable engineering calculator and scientific measurement app that works entirely as an offline conversion app, requiring no internet access at any time.

What immediately sets this app apart is its philosophy. Created by Frank Harr, the app is the pure expression of one person’s vision of how unit conversions should work. It is a lightweight utility app that is privacy-focused, with no ads, no in-app purchases, and no user data collection, making it ideal for professional and academic environments.

At its core, the app is an advanced unit converter supporting an extraordinary range of systems of measurement. These include global and historical standards such as SI units, Imperial system, U.S. Customary units, U.S. Survey units, British Gravimetric system, Absolute English, English Engineering units, International Yard and Avoirdupois Pound, ISO Steam Table, International Steam Table (1956), Thermochemical units, Gravitational Metric, Gaussian units, cm-g-s, m-kg-s, m-t-s, Nautical units, Logarithmic units, HLU, U.K. 1995, Indian Survey, Bangladeshi, Nepalese, Burmese/Myanmarese, Hong Kongese, Japanese, Korean, Taiwanese, Thai, and even non-standard measurement systems.

Beyond systems, the app supports units across 39 measured properties, making it a truly professional measurement tool. These include length measurement, speed and velocity units, acceleration units, area measurement, volume and capacity units, flow rate measurement, mass measurement, density units, temperature conversion, force measurement, pressure units, torque measurement, time units, and probability units.

It also handles advanced scientific domains such as energy and work units, energy distribution, power measurement, thermal resistance, plane angles, solid angles, dynamic viscosity, kinematic viscosity, and fluidity, making it invaluable for physics, engineering, and applied sciences.

Electrical and electromagnetic properties are equally well supported, including electric charge, electric current, voltage and electrical potential, electric field units, magnetic B field, magnetic H field, magnetic moment, magnetic flux, electrical resistance, electrical resistivity, capacitance, inductance, luminance units, illuminance units, and radioactive source activity.

Unlike most conversion apps, this app excels at multi-unit conversion and mixed-unit input support. You can seamlessly work with feet and inches conversion, pounds and ounces conversion, or even miles and furlongs conversion without being forced into a single-unit format. This approach mirrors how measurements are actually used in real-world engineering and scientific workflows.

One of its most distinctive strengths is fraction-based measurement. The app fully supports fraction conversion, engineering fractions, and scientific fractions, allowing users to work naturally with halves, eighths, sevenths, and other real-world divisions. It embraces non-decimal measurements, acknowledging that measurement precision tools don’t always belong in decimal-only systems.

The app also goes beyond simple unit swapping by offering a powerful ratio conversion tool. With this unit ratios calculator, users can perform complex conversions such as liters per kilometer to miles per gallon or meters per megawatt to feet per horsepower, enabling true cross-domain unit conversion across unrelated measurement types.

For ultimate flexibility, the app supports custom unit conversion through custom unit creation. Users can define and apply user-defined measurement units, adapting the tool to niche research needs, proprietary systems, or experimental workflows that standard apps cannot accommodate.

Whether used as a research utility app, an engineering productivity app, or a precision measurement utility, Frank Harr’s Conversion App stands apart as a deeply thoughtful, rigorously capable tool. It is not just about converting numbers—it is about respecting how measurements are actually understood, combined, and used in science, engineering, and everyday problem-solving.