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Mass Flow Conversion
Tool Description
Mass Flow Conversion is an online mass flow rate unit converter supporting kilogram per second (kg/s), kilogram per hour (kg/h), gram per second (g/s), gram per minute (g/min), tonne per hour (t/h), tonne per day (t/d), pound per second (lb/s), and pound per hour (lb/h). Enter any value and unit to instantly see the corresponding results in all other units, suitable for chemical process design, pipeline transport calculations, industrial production monitoring, water supply and drainage engineering, energy metering, and more.
How to Use
- Enter a value
Type the value to convert in the input box. Supports integers and decimals, e.g.
100,0.5 - Select source unit
Choose the unit of the current value from the dropdown list (kg/s/kg/h/g/s/g/min/t/h/t/d/lb/s/lb/h)
- View results
Click the "Convert" button or press Enter. The result area below will display the corresponding values in all units, with a copy button next to each result for convenience
Use Cases
- Chemical and process industries: In chemical production, the mass flow rate of materials is a core process parameter. Control systems often display values in kg/h or t/h, while design calculations may use kg/s. This tool enables quick switching between different units for process design and operation monitoring
- Pipeline transport and water engineering: Flow rate is a critical design parameter in pump selection and pipeline design. Chinese standards commonly use t/h or kg/s, while international standards often use lb/s or lb/h. Use this tool to unify units for equipment selection and scheme comparison
- Energy and power engineering: The mass flow rate of fuel and working fluid in boilers, steam turbines, and gas turbines is a key indicator for performance evaluation. Steam flow is often measured in t/h, cooling water in kg/s, and fuel in lb/h (imperial). Use this tool to quickly convert between systems for cross-system data comparison
Key Advantages
- Free and Easy
The tool is completely free, requiring no registration or installation. Just open the page and start using it, lowering the barrier to entry.
- Local Computation
All conversions run in your browser; your input data is never uploaded to a server, ensuring privacy and security.
- Instant to Use
The interface is clean and intuitive. Enter a value and unit to get all results with one click—no complex operations to learn.
- Full Coverage
Supports mutual conversion among major mass flow rate units such as kg/s, kg/h, g/s, g/min, t/h, t/d, lb/s, and lb/h.
- Accurate Conversion
Based on precise time relationships (1 h = 3,600 s) and the international pound definition (1 lb = 0.45359237 kg), delivering stable and reliable results.
- One-Click Copy
Each result has a copy button on the right, so you can quickly paste values into documents or spreadsheets for further use.
Mass Flow Rate Unit Conversion Relationships
The following table shows the conversion relationships between mass flow rate units, using kilogram per second (kg/s) as the base unit:
| Unit Name | Abbreviation | Conversion Relationship | Equivalent kg/s |
|---|---|---|---|
| Kilogram per Second | kg/s | 1 kg/s (base unit) | 1 |
| Kilogram per Hour | kg/h | 1 kg/h = 1/3600 kg/s | 0.0002778 |
| Gram per Second | g/s | 1 g/s = 0.001 kg/s | 0.001 |
| Gram per Minute | g/min | 1 g/min = 1/60000 kg/s | 0.00001667 |
| Tonne per Hour | t/h | 1 t/h = 1000/3600 ≈ 0.2778 kg/s | 0.2778 |
| Tonne per Day | t/d | 1 t/d = 1000/86400 ≈ 0.01157 kg/s | 0.01157 |
| Pound per Second | lb/s | 1 lb/s ≈ 0.4536 kg/s | 0.4536 |
| Pound per Hour | lb/h | 1 lb/h ≈ 0.000126 kg/s | 0.000126 |
Common Industrial Mass Flow Rate Reference Values
The following table shows typical mass flow rate ranges in different industrial scenarios for reference:
| Application Scenario | Mass Flow Rate Range |
|---|---|
| Laboratory micro-injection pump | ~0.001 kg/s |
| Small chemical experiment setup | 0.01 ~ 0.1 kg/s |
| Medium chemical production line | 0.1 ~ 10 kg/s |
| Large chemical plant / power plant auxiliary | 10 ~ 100 kg/s |
| Power plant boiler main steam pipe | 100 ~ 1,000 kg/s |
| Large oil pipeline | 1,000 ~ 10,000 kg/s |
| Large hydroelectric station / river | > 10,000 kg/s |
Difference Between Mass Flow Rate and Volumetric Flow Rate
Mass flow rate (symbol ṁ) and volumetric flow rate (symbol Q) are two closely related but different physical quantities in fluid mechanics. Mass flow rate measures the mass of fluid passing through a pipe cross-section per unit time, with units of kg/s; volumetric flow rate measures the volume of fluid passing through a pipe cross-section per unit time, with units of m³/s.
The relationship between the two is: Mass flow rate = Volumetric flow rate × Density, i.e. ṁ = Q × ρ. For example, the density of water is approximately 1,000 kg/m³. If the volumetric flow rate of water is 0.01 m³/s, the mass flow rate is 0.01 × 1,000 = 10 kg/s = 36 t/h. Mass flow rate is not affected by temperature and pressure changes (due to mass conservation), while volumetric flow rate changes with fluid density variations. Therefore, mass flow rate is typically used in high-precision metering and trade settlement.
FAQ
Mass flow rate (symbol ṁ) is the mass of fluid passing through a pipe cross-section per unit time. The SI standard unit is kilogram per second (kg/s). 1 kg/s means 1 kilogram of fluid mass passes through the cross-section every second. Mass flow rate follows the law of mass conservation — in steady-state flow, the mass flow rate at every cross-section of a pipe is equal (excluding leakage and accumulation), making it one of the most fundamental parameters in fluid transport and metering.
1 t/h = 1,000 kg / 3,600 s ≈ 0.2778 kg/s, 1 kg/s = 3.6 t/h. Tonnes per hour (t/h) is the most commonly used mass flow rate unit in industrial boilers, power plants, and large chemical plants. For example, a 1,000 MW ultra-supercritical coal-fired power unit has a main steam flow rate of approximately 3,000 t/h ≈ 833 kg/s. Quick memory tip: divide the t/h value by 3.6 to get the kg/s value.
1 lb/s = 0.45359237 kg/s (exact value, based on the international pound definition), 1 lb/h = 0.45359237 / 3,600 ≈ 0.000126 kg/s. The pound (lb) is an imperial mass unit still widely used in engineering practices in the United States and some Commonwealth countries. For example, the US petrochemical industry often labels pipeline flow rates in lb/h, while international standards use kg/s or t/h. Use this tool to quickly convert between the two unit systems.
1 g/s = 0.001 kg/s, 1 g/min = 1/60,000 ≈ 0.00001667 kg/s. Gram-level mass flow rate units are typically used in laboratory micro-injection, pharmaceutical preparation production, precision chemical dosing, environmental monitoring sampling, and other small-flow scenarios. For example, laboratory syringe pump flow rates are usually in the range of 0.1~100 g/min, and HPLC mobile phase flow rates are typically in the range of 0.5~5 g/min.
No. All conversion calculations are performed entirely locally in your browser using pure JavaScript mathematical computation. Your input data will never leave your device, so you can use this tool with confidence.
This tool uses JavaScript double-precision floating-point numbers (64-bit IEEE 754) for calculations, which provides sufficient accuracy for the vast majority of everyday engineering scenarios. Conversions between kg/s and other mass flow rate units are based on precise mathematical relationships (time conversion: 1 h = 3,600 s, 1 d = 86,400 s, 1 min = 60 s) and the international pound definition (1 lb = 0.45359237 kg). Conversion results are exact within floating-point precision. Decimal results are displayed with up to 6 significant decimal places, and excessively long decimals are automatically truncated.
It supports 8 common mass flow rate units: kilogram per second (kg/s), kilogram per hour (kg/h), gram per second (g/s), gram per minute (g/min), tonne per hour (t/h), tonne per day (t/d), pound per second (lb/s), and pound per hour (lb/h). Enter any unit and value, and the tool immediately shows the corresponding result in the other 7 units, making it easy to switch freely between metric and imperial units.
Currently it converts a single value instantly. Enter one value and select the source unit, and the results area shows all target units simultaneously. To process large batches of data, copy the results one by one. For higher-frequency batch needs, member benefits offer a more efficient tool experience.
It wins on being lightweight and instant. Unlike professional process simulation or pipeline design software that requires installation and licensing, this tool needs no download and works as soon as you open the page. It covers all everyday mass flow rate unit conversion needs, ideal for process checks, literature review, and quick on-site calculations. For complex pipeline network simulation, professional software is still recommended.
It is usually an input format issue. Make sure the input box contains a valid number (integers and decimals such as 100, 0.5) with no spaces, letters, or special symbols. If there is still no result, try refreshing the page and entering again. The tool computes entirely locally, so it is not affected by network fluctuations.
They measure different things. Mass flow rate (unit kg/s) measures the mass of fluid passing through a cross-section per unit time and does not change with temperature or pressure; volumetric flow rate (unit m³/s) measures the volume and changes with fluid density. The relationship is mass flow rate = volumetric flow rate × density (ṁ = Q × ρ). Mass flow rate is typically used in high-precision metering and trade settlement. This tool focuses on mass flow rate unit conversion.
Yes. The page is responsive and works normally on mobile browsers for input, conversion, and copying. All calculations run locally, so the mobile experience is smooth—no app installation required to convert units anytime, anywhere.
Content last updated：2026-08-06
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