Mass Flow Rate Converter

How to Use

1. 1Type a mass flow rate value in the input field
2. 2Select your starting unit from the From dropdown - choose from SI / Metric, US Customary, or Slug / Aerospace
3. 3Select your target unit from the To dropdown - the result appears instantly
4. 4All 19 conversions appear simultaneously, grouped by unit system
5. 5Hover any result row to reveal the copy (📋) and use-as-input (⇅) buttons
6. 6Click the copy icon to copy a value to your clipboard
7. 7Click ⇅ on any row to use that unit and value as the new input for instant reverse conversion
8. 8Use the ⇄ button between From and To to swap both units while updating the value
9. 9Adjust 'Sig. figures' to control result precision (3 to 12 significant digits)
10. 10Toggle 'Sci notation' for very small values such as mg/s from a t/h input, or very large values such as slug/h from a mg/s input
11. 11Collapse a group by clicking its header to reduce clutter when you only need one unit system
12. 12Open 'Common conversions & mass flow reference' at the bottom for a quick-reference table with key conversions and real-world mass flow values

Features

• 19 mass flow rate units across 3 unit systems
• SI / Metric: kg/s, kg/min, kg/h, g/s, g/min, g/h, mg/s, t/s, t/min, t/h
• US Customary: lb/s, lb/min, lb/h, oz/s, oz/min, oz/h
• Slug / Aerospace: slug/s, slug/min, slug/h
• Includes kg/s - the SI base unit used in chemical and process engineering
• Includes lb/min - the dominant unit in North American HVAC and pump specifications
• Includes t/h - standard industrial unit for large-scale process and pipeline flow
• All 19 conversions shown simultaneously - no need to select a single target unit
• Click any result row to use it as the new input for instant reverse conversion
• Adjustable significant figures: 3, 4, 5, 6, 8, 10, or 12 digits
• Toggleable scientific notation for very small or very large values
• Collapsible unit-system groups to reduce visual clutter
• One-click copy to clipboard for any converted value
• Quick-reference table with 12 key conversions including real-world engineering references
• Exact factors: 1 lb = 0.45359237 kg (exact), 1 slug ≈ 14.5939 kg (NIST-traceable)
• Default: 1 kg/s → lb/min (most common process-to-HVAC conversion)
• 100% browser-based - no server, no data upload

Frequently Asked Questions