Professional Unit Conversion
Select a physical quantity. Only units of the same dimension can be converted.
Physics / Quantity Reference
Selected Unit Information
Convert to All Units
The entered value converted into every supported unit within the selected physical quantity.
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Professional Physics & Engineering Unit Converter
Reportix All-in-One Unit Converter is designed around dimensional consistency. A unit conversion changes the numerical representation of a physical quantity without changing the quantity itself. For that reason, the tool keeps mass, force, energy, torque, pressure, power and other physical quantities logically separate.
Why dimensional consistency matters
Units can only be directly converted when they describe the same physical dimension. Mass such as kilograms cannot be directly converted to force such as newtons without introducing gravitational acceleration. Similarly, torque and energy can both contain the product N·m, but they represent different physical concepts and are therefore presented as separate categories.
Exact definitions and practical precision
Where international definitions are exact, the converter uses those exact relationships. Examples include 1 inch = 25.4 mm, 1 pound = 0.45359237 kg, standard gravity g₀ = 9.80665 m/s², 1 bar = 100,000 Pa and 1 standard atmosphere = 101,325 Pa. Derived decimal outputs are then displayed according to the selected precision.
Temperature is not an ordinary scale conversion
Temperature scales require both scale factors and offsets. Celsius, Fahrenheit and kelvin therefore use affine conversion equations rather than a simple multiplication factor. Values below absolute zero are flagged as physically invalid.
Useful for engineering and construction
Common construction and engineering conversions include millimetres to inches, metres to feet, square metres to square feet, cubic metres to cubic feet, MPa to psi, kN to N, N·m to lb·ft, kg/m³ to lb/ft³, litres per second to cubic metres per hour, and kW to horsepower.
Popular Unit Conversions Available on This Page
This single Reportix converter supports common searches in both directions, including mm to inches and inches to mm, meters to feet and feet to meters, square meters to square feet and square feet to square meters, cubic meters to cubic feet and cubic feet to cubic meters, kg to lb and lb to kg, Celsius to Fahrenheit and Fahrenheit to Celsius, MPa to psi and psi to MPa, bar to psi and psi to bar, km/h to mph and mph to km/h, kW to horsepower and horsepower to kW, and N·m to lb·ft and lb·ft to N·m.
Length, Area & Volume Conversions
Use the Length converter for millimetres, centimetres, metres, kilometres, inches, feet, yards, miles and nautical miles. The Area converter supports m², ft², in², yd², acres and hectares. The Volume converter supports m³, litres, millilitres, ft³, in³, yd³, US gallons and Imperial gallons.
Mass, Force, Pressure & Engineering Conversions
The Mass converter supports kilograms, grams, milligrams, tonnes, pounds, ounces and stones. Force supports N, kN, MN, lbf, kgf and dynes. Pressure supports Pa, kPa, MPa, bar, mbar, psi, atm, torr and mmHg. These categories are kept scientifically separate so mass is never incorrectly treated as force.
Temperature, Speed, Energy & Power Conversions
Convert Celsius, Fahrenheit, kelvin and Rankine using proper scale-and-offset equations. Speed supports m/s, km/h, mph, ft/s and knots. Energy supports J, kJ, MJ, Wh, kWh, calories, kilocalories, BTU and ft·lbf. Power supports W, kW, MW, mechanical horsepower, metric horsepower and BTU/h.
Torque, Density, Flow, Time, Frequency, Angle & Data
Use dedicated categories for torque, density, volumetric flow rate, time, rotational or electrical frequency, angular measure and digital storage. Decimal data units such as GB remain distinct from IEC binary units such as GiB.
Frequently Asked Questions
Can kilograms be converted directly to newtons?
No. Kilogram is a unit of mass and newton is a unit of force. Weight force is calculated using F = m·g, so a gravitational acceleration must be specified before mass can be converted into weight force.
Why is 1 inch exactly 25.4 millimetres?
The international inch is defined as exactly 25.4 millimetres. The converter therefore treats this relationship as exact rather than measured.
Why can torque and energy both use N·m but remain separate?
They represent different physical quantities. Energy is a scalar quantity associated with work or transferred energy, while torque is a moment of force associated with rotational effect. Their dimensional expressions are related, but their physical meaning is not interchangeable.
Does the converter work without uploading data?
Yes. All calculations are performed locally in the browser. No file upload or backend processing is required for the unit conversion engine.
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All-in-One Unit Converter FAQ
Can I convert units in both directions?
Yes. Select any compatible source and destination units in the same physical category. For example, you can convert MPa to psi or psi to MPa, kg to lb or lb to kg, and Celsius to Fahrenheit or Fahrenheit to Celsius.
Does this converter mix mass and force?
No. Mass and force are separate physical quantities. Kilograms belong to mass, while newtons and pound-force belong to force. The converter keeps dimensionally different quantities separate.
Which engineering conversions are included?
The page includes common engineering quantities such as length, area, volume, force, pressure, speed, acceleration, energy, power, torque, density, flow rate, frequency and angle, alongside everyday unit categories.
Are SI, metric and Imperial units supported?
Yes. Depending on the selected category, the tool includes SI and metric units together with commonly used US customary and Imperial units.
Unit Conversion Guide for Engineering, Construction and Everyday Work
Reportix combines compatible measurement categories in one browser-based converter so you can move between SI, metric, Imperial and US customary units without mixing different physical quantities. It is useful when drawings, equipment datasheets, BOQs, technical reports, laboratory values or everyday measurements use a different unit system from the one you need.
How to use the All-in-One Unit Converter
- Choose the physical quantity, such as Length, Pressure, Power, Torque or Flow Rate.
- Enter the source value and select its current unit.
- Select the target unit. The tool keeps the conversion within the same physical dimension.
- Review the result and adjust decimal precision, number format or trailing zeros when needed.
- Use Convert to All Units for a quick reference table across the supported units in that category.
Length, area and volume
Convert common drawing and measurement units including millimetres, centimetres, metres, kilometres, inches, feet, yards and miles, plus area and volume units used for land, rooms, materials and quantities. Common needs include mm to inch and inch to mm, meter to feet and feet to meter, m² to ft² and ft² to m², and m³ to ft³ and ft³ to m³.
Mass, force, acceleration, energy, power and torque
These mechanics categories are deliberately kept separate. Kilograms measure mass, newtons measure force, and torque is not treated as energy. This helps prevent physically invalid direct conversions when reviewing calculations, equipment data or technical schedules.
Pressure and flow rate
Pressure options include Pa, kPa, MPa, bar, mbar, psi, standard atmosphere, torr and conventional mmHg. Volumetric flow includes m³/s, m³/h, L/s, L/min, CFM and US GPM. Typical engineering searches include MPa to psi, psi to MPa, bar to psi, L/s to m³/h and CFM to m³/h.
Temperature conversions
Celsius, Fahrenheit, kelvin and Rankine use their proper scale-and-offset equations rather than a single multiplication factor. The converter also guards against temperatures below absolute zero.
Digital storage
Decimal storage units such as kB, MB, GB and TB are kept distinct from binary IEC units such as KiB, MiB, GiB and TiB, so GB and GiB are not silently treated as the same quantity.
Real-world uses
Construction and site work: compare metric drawings with Imperial supplier data, convert areas and volumes for quantities, or standardize measurements before reporting.
Equipment and technical submittals: compare kW and horsepower, N·m and lb·ft, MPa and psi, or metric and Imperial density values.
Reports and spreadsheets: normalize source measurements before entering them into BOQs, progress reports, inspection records or calculation sheets.
Education and general use: check common measurement relationships while keeping the physical quantity visible.
Important engineering limits
A direct unit conversion is valid only when the source and target represent the same physical quantity. Kilograms cannot become newtons without an acceleration assumption; volumetric flow cannot become mass flow without density; and gauge pressure cannot become absolute pressure without a reference atmospheric pressure. Reportix does not hide these extra assumptions inside a simple conversion.
Precision and rounding
The calculation is performed before the displayed result is formatted. Choose a precision appropriate to your source measurement and engineering method; extra displayed decimals do not make the original measurement more accurate.
Privacy and processing
No file upload is required. Unit values are converted in the browser. Normal site-level technologies such as analytics and, when enabled, advertising services are covered by the Reportix Privacy Policy.
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Frequently Asked Questions
Can I convert units in both directions?
Yes. Compatible pairs work either way—for example mm to inch or inch to mm, kg to lb or lb to kg, MPa to psi or psi to MPa, and Celsius to Fahrenheit or Fahrenheit to Celsius.
Why can’t kilograms be converted directly to newtons?
Kilograms measure mass and newtons measure force. A mass-to-force calculation needs an acceleration assumption, so they remain separate categories.
Why are temperature conversions different?
Temperature scales have different zero points and scale sizes, so Celsius, Fahrenheit, kelvin and Rankine require their proper equations rather than a simple ratio.
Are US gallons and Imperial gallons the same?
No. They are different volume definitions. Where gallon-based units are supported, the relevant system is identified.
What is the difference between GB and GiB?
GB is decimal and based on powers of 1000; GiB is an IEC binary unit based on powers of 1024.
Can I use these results for engineering work?
The tool is useful for routine conversion and reference work. For safety-critical design, contractual quantities or regulated calculations, verify the source unit, reference condition, significant figures and applicable project standard.
Does Reportix upload my conversion values?
No file upload is required for this converter. The conversion engine works in the browser. See the Privacy Policy for site-level analytics and related data practices.