How to Use Beta Ratio Calculator
Measure Your Orifice Plate Bore
Enter the hole diameter of your orifice plate in inches. This is typically found on the plate, but you should verify.
Enter Your Pipe ID
Find the inside diameter of your pipe. Typically the pipe ID is stamped on the meter run. For Schedule 40: 2"=2.067", 3"=3.068", 4"=4.026", 6"=6.065", 8"=7.981", 10"=10.020".
Click Calculate
The calculator instantly shows your beta ratio and tells you which compliance zone it falls into.
Review Your Zone
Green = optimal, Yellow = acceptable but not ideal, Red = not compliant. Aim for the green zone.
The hole size in your orifce plate
The inside diameter of your pipe
Regulatory Range: 0.20 to 0.75
Optimal Range: 0.30 to 0.70
Want more details? Read our blog post: “Understanding Beta Ratio”
Other Tools That May Help
Save time in the field with our free downloadable orifice plate sizing chart. Print it, laminate it, and keep it in your truck. Quick reference for minimum and maximum orifice plate bore sizes for all standard Schedule 40 pipe with a flange-tap configuration.
Need Expert Measurement Assistance?
For complex measurement systems, custom applications, or full system audits, our measurement specialists are ready to help. Schedule with us today.