Pipe Diameter - Flow Rate Calculator

Pipe Diameter (meters):

Pipe Diameter (inches):

Pipe Diameter (mm):

Water is flowing at 36 inches per second with a flow rate of 1.0472 cubic feet per second. What is the required pipe diameter?

Steps to Use the Calculator:

1️⃣ Select the value you want to solve for: Choose "Pipe Diameter".

2️⃣ Enter velocity: Type 36 in the velocity box and select inches per second from the menu.

3️⃣ Enter flow rate: Type 1.0472 in the flow rate box and select cubic feet per second from the menu.

4️⃣ Click "Calculate": The result will be displayed as 8 inches.

5️⃣ View additional unit conversions: The answer will also be shown in meters, millimeters, feet, and centimeters.

✅ Result: Pipe Diameter = 8 inches

Nominal Pipe Size (ins)	Type K Copper Diameter (ins)		Type L Copper Diameter (ins)		Type M Copper Diameter (ins)		Pipe Sizing Criteria
Nominal Pipe Size (ins)	Outside	Inside	Outside	Inside	Outside	Inside	Velocity (Ft/sec)	Loss in PD'/100'	Flow (GPM)
0.25	0.375	0.305	0.375	0.315	0.5	0.45	1.0	3	0.5
0.38	0.5	0.402	0.5	0.43	0.5	0.45	1.0	3	0.5
0.50	0.625	0.527	0.625	0.545	0.625	0.569	1.5	3	1
0.75	0.875	0.745	0.875	0.785	0.875	0.811	2.0	3	3
1.00	1.125	0.995	1.125	1.025	1.125	1.055	2.5	3	7
1.25	1.375	1.245	1.375	1.265	1.375	1.291	3.0	3	12
1.50	1.625	1.481	1.625	1.505	1.625	1.527	3.5	3	17
2.00	2.125	1.959	2.125	1.985	2.125	2.009	4.0	3	35
2.50	2.625	2.435	2.625	2.465	2.625	2.495	4.5	3	70
3.00	3.125	2.907	3.125	2.945	3.125	2.981	5.0	3	110
3.50	3.625	3.385	3.625	3.459	3.625	3.459	5.5	3	160
4.00	4.125	3.857	4.125	3.905	4.125	3.935	6.0	2.5	225
5.00	5.125	4.805	5.125	4.875	5.125	4.907	6.5	2.5	380
6.00	6.125	5.741	6.125	5.845	6.125	5.881	7.0	2.2	575
8.00	8.125	7.583	8.125	7.725	8.125	7.785	7.5	1.9	1105
10.00	10.125	9.449	10.125	9.625	10.125	9.701	8.0	1.5	1835
12.00	12.125	11.315	12.125	11.565	12.125	11.617	8.5	1	2800