.calculator-container {
max-width: 800px;
margin: 0 auto;
font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
background: #fff;
padding: 20px;
border-radius: 8px;
box-shadow: 0 4px 15px rgba(0,0,0,0.1);
}
.calc-header {
text-align: center;
margin-bottom: 25px;
background-color: #f8f9fa;
padding: 15px;
border-radius: 6px;
border-left: 5px solid #007bff;
}
.calc-header h2 {
margin: 0;
color: #2c3e50;
font-size: 24px;
}
.input-group {
margin-bottom: 20px;
}
.input-group label {
display: block;
margin-bottom: 8px;
font-weight: 600;
color: #333;
}
.input-group input, .input-group select {
width: 100%;
padding: 12px;
border: 1px solid #ccc;
border-radius: 4px;
font-size: 16px;
box-sizing: border-box;
}
.input-group input:focus, .input-group select:focus {
border-color: #007bff;
outline: none;
box-shadow: 0 0 0 3px rgba(0,123,255,0.1);
}
.row {
display: flex;
gap: 20px;
flex-wrap: wrap;
}
.col-half {
flex: 1;
min-width: 250px;
}
button.calc-btn {
width: 100%;
padding: 15px;
background-color: #007bff;
color: white;
border: none;
border-radius: 4px;
font-size: 18px;
font-weight: bold;
cursor: pointer;
transition: background-color 0.3s;
}
button.calc-btn:hover {
background-color: #0056b3;
}
#result-area {
margin-top: 25px;
padding: 20px;
background-color: #e9f7ef;
border: 1px solid #c3e6cb;
border-radius: 4px;
text-align: center;
display: none;
}
.result-value {
font-size: 32px;
color: #155724;
font-weight: bold;
margin: 10px 0;
}
.result-label {
font-size: 16px;
color: #555;
}
.content-section {
margin-top: 40px;
line-height: 1.6;
color: #444;
}
.content-section h2 {
color: #2c3e50;
border-bottom: 2px solid #eee;
padding-bottom: 10px;
margin-top: 30px;
}
.content-section h3 {
color: #007bff;
margin-top: 25px;
}
.content-section table {
width: 100%;
border-collapse: collapse;
margin: 20px 0;
}
.content-section th, .content-section td {
border: 1px solid #ddd;
padding: 12px;
text-align: left;
}
.content-section th {
background-color: #f2f2f2;
}
.formula-box {
background: #f8f9fa;
padding: 15px;
border-left: 4px solid #007bff;
font-family: monospace;
margin: 15px 0;
}
function calculateFlowConversion() {
var valInput = document.getElementById("flowValue").value;
var fromUnit = document.getElementById("fromUnit").value;
var toUnit = document.getElementById("toUnit").value;
var resultArea = document.getElementById("result-area");
var resultDisplay = document.getElementById("conversionResult");
var detailsDisplay = document.getElementById("conversionDetails");
// Validate input
if (valInput === "" || isNaN(valInput)) {
alert("Please enter a valid numeric value for the flow rate.");
return;
}
var value = parseFloat(valInput);
// Conversion factors relative to Cubic Meters per Second (m3/s)
// Base unit: m3/s = 1
var factors = {
"m3s": 1.0,
"m3h": 1.0 / 3600.0,
"m3min": 1.0 / 60.0,
"ls": 0.001,
"lmin": 0.001 / 60.0,
"lh": 0.001 / 3600.0,
"gpm_us": 0.0000630901964, // US Gallons per minute
"gpm_uk": 0.0000757682, // UK Gallons per minute
"cfm": 0.000471947443, // Cubic feet per minute
"cfs": 0.0283168466, // Cubic feet per second
"gph_us": 0.0000630901964 / 60.0 // US Gallons per hour
};
var unitNames = {
"m3s": "m³/s",
"m3h": "m³/h",
"m3min": "m³/min",
"ls": "L/s",
"lmin": "L/min",
"lh": "L/h",
"gpm_us": "US GPM",
"gpm_uk": "UK GPM",
"cfm": "CFM",
"cfs": "ft³/s",
"gph_us": "US GPH"
};
// Calculate base value in m3/s
var baseValue = value * factors[fromUnit];
// Convert base value to target unit
var result = baseValue / factors[toUnit];
// Formatting logic to handle very small or very large numbers
var formattedResult;
if (result === 0) {
formattedResult = "0";
} else if (Math.abs(result) 1000000) {
formattedResult = result.toExponential(4);
} else {
formattedResult = parseFloat(result.toFixed(5));
}
resultArea.style.display = "block";
resultDisplay.innerHTML = formattedResult + " " + unitNames[toUnit];
detailsDisplay.innerHTML = value + " " + unitNames[fromUnit] + " = " + formattedResult + " " + unitNames[toUnit];
}
Volume Flow Rate Converter
Cubic Meters per Second (m³/s)
Cubic Meters per Hour (m³/h)
Cubic Meters per Minute (m³/min)
Liters per Second (L/s)
Liters per Minute (L/min)
Liters per Hour (L/h)
Gallons per Minute (US GPM)
Gallons per Minute (UK GPM)
Cubic Feet per Minute (CFM)
Cubic Feet per Second (CFS)
Gallons per Hour (US GPH)
Cubic Meters per Second (m³/s)
Cubic Meters per Hour (m³/h)
Cubic Meters per Minute (m³/min)
Liters per Second (L/s)
Liters per Minute (L/min)
Liters per Hour (L/h)
Gallons per Minute (US GPM)
Gallons per Minute (UK GPM)
Cubic Feet per Minute (CFM)
Cubic Feet per Second (CFS)
Gallons per Hour (US GPH)
Converted Result:
—
About Volume Flow Rate Conversion
Volume flow rate defines the volume of fluid (liquid or gas) which passes through a cross-sectional area per unit of time. It is a critical parameter in engineering, plumbing, HVAC (Heating, Ventilation, and Air Conditioning), and environmental science. Correctly converting between units is essential for sizing pumps, pipes, and ventilation ducts.
Why is Flow Rate Conversion Important?
Different industries and regions use different standards for measuring flow. For example:
- Hydraulics & Plumbing: Often use Liters per Minute (L/min) or Gallons per Minute (GPM).
- HVAC Systems: Typically measure airflow in Cubic Feet per Minute (CFM).
- Industrial Processes: May use Cubic Meters per Hour (m³/h) for large scale fluid movement.
- Water Treatment: Often uses Million Gallons per Day (MGD) or Cubic Meters per Second (m³/s).
Common Conversion Formulas
While our calculator handles the complex math instantly, here are some standard formulas used to convert flow rates manually. These are based on converting to/from the SI unit, Cubic Meters per Second ($m^3/s$).
From GPM (US) to L/min:
$L/min = GPM \times 3.78541$
$L/min = GPM \times 3.78541$
From CFM to m³/h:
$m^3/h = CFM \times 1.699$
$m^3/h = CFM \times 1.699$
From L/min to m³/s:
$m^3/s = \frac{L/min}{60,000}$
$m^3/s = \frac{L/min}{60,000}$
Understanding the Units
| Unit Symbol | Unit Name | Typical Application |
|---|---|---|
| GPM | Gallons Per Minute | US Plumbing, Fire Hoses, Pool Pumps |
| CFM | Cubic Feet Per Minute | Air Conditioning, Fans, Air Compressors |
| m³/h | Cubic Meters per Hour | Industrial Pumps, Ventilation |
| L/s | Liters per Second | European Water Supply, Drainage |
Example Calculation
Imagine you have a water pump rated at 100 L/min and you need to know if it meets a specification requiring 25 US GPM.
- Step 1: Identify the conversion factor. 1 L/min ≈ 0.264172 US GPM.
- Step 2: Multiply your value by the factor: $100 \times 0.264172 = 26.417$ GPM.
- Result: Since 26.4 GPM is greater than 25 GPM, the pump meets the specification.
Tips for Accurate Conversion
Always verify whether "Gallons" refers to US Gallons or UK (Imperial) Gallons, as they differ significantly (1 UK Gallon ≈ 1.2 US Gallons). Similarly, ensure you distinguish between mass flow rate (kg/s) and volume flow rate (m³/s); this calculator is specifically for volume.