TechTools

Flow Rate Converter

From
To
Sig. figures:

Milliliter per Second

mL/s

1666.67

Milliliter per Minute

mL/min

100000

Liter per Second

L/s

1.66667

Liter per Minute

L/min

100(input)

Liter per Hour

L/h

6000

Cubic Meter per Second

m³/s

0.00166667

Cubic Meter per Minute

m³/min

0.1

Cubic Meter per Hour

m³/h

6

Cubic Foot per Second

ft³/s

0.0588578

Cubic Foot per Minute

ft³/min

3.53147

Cubic Foot per Hour

ft³/h

211.888

Gallon per Minute (US)

GPM

26.4172

Gallon per Hour (US)

GPH

1585.03

Gallon per Day (US)

GPD

38040.8

Million Gallons per Day

MGD

0.0380408

Gallon per Minute (UK)

UK gal/min

21.9969

Gallon per Hour (UK)

UK gal/h

1319.82

Gallon per Day (UK)

UK gal/d

31675.6

Oil Barrel per Hour

bbl/h

37.7389

Oil Barrel per Day

bbl/day

905.733

Acre-Foot per Hour

ac·ft/h

0.00486428

Acre-Foot per Day

ac·ft/d

0.116743

Hover any row to copy the value or use it as the new input.

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A comprehensive flow rate converter covering 22 units across four groups - all results shown simultaneously. Metric/SI covers mL/s, mL/min, L/s, L/min, L/h, m³/s, m³/min, and m³/h - the standard units for European HVAC design, water treatment, and laboratory work. US Customary covers CFS (ft³/s), CFM (ft³/min), ft³/h, GPM, GPH, GPD, and MGD - the everyday units for North American pump sizing, plumbing, fire suppression, and municipal water systems. UK Imperial covers UK gal/min, UK gal/h, and UK gal/day - 20% larger than US gallons. Industrial covers oil barrel per hour and per day (42 US gal = 1 bbl), plus acre-foot per hour and per day for large-scale irrigation and reservoir management. Type a value, select a unit, and every other unit updates instantly. Click any result row to use it as the new input for reverse conversion. Adjustable significant figures (3–12) and toggleable scientific notation. Includes a 12-entry quick-reference table covering the most common engineering conversions. 100% browser-based - your data never leaves your device.

How to Use

  1. 1Type a flow rate value in the input field
  2. 2Select your starting unit from the From dropdown - choose from Metric/SI, US Customary, UK Imperial, or Industrial
  3. 3Select your target unit from the To dropdown - the result appears instantly
  4. 4All 22 conversions appear simultaneously, grouped by system: Metric/SI, US Customary, UK Imperial, and Industrial
  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 large or small values (e.g. m³/s ↔ mL/min)
  11. 11Collapse a group by clicking its header to reduce clutter when you only need one unit system
  12. 12Open 'Common conversions' at the bottom for a quick-reference table of key flow rate equivalents

Features

  • 22 flow rate units across 4 unit systems
  • Metric/SI: mL/s, mL/min, L/s, L/min, L/h, m³/s, m³/min, m³/h
  • US Customary: CFS (ft³/s), CFM (ft³/min), ft³/h, GPM, GPH, GPD, MGD
  • UK Imperial: UK gal/min, UK gal/h, UK gal/day (UK gallon = 4.546 L vs US 3.785 L)
  • Industrial: oil bbl/h, oil bbl/day (42 US gal), acre-ft/h, acre-ft/day
  • All 22 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 extreme values (mL/s ↔ MGD)
  • Collapsible unit groups to reduce visual clutter
  • One-click copy to clipboard for any converted value
  • 12-entry quick-reference table for the most common engineering flow rate conversions
  • Exact conversion factors: 1 US gal = 3.785411784 L, 1 UK gal = 4.54609 L, 1 oil bbl = 42 US gal
  • 100% browser-based - no server, no data upload

Frequently Asked Questions

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