OperatorMaster
Practice QuestionsPractice ExamMath CenterCoursesPremiumAbout
Start Practicing
OperatorMaster

Free study tools for water and wastewater operators.

AccountSettingsAboutPricing and PaymentExam Prep BooksGet the iPhone AppSupportPrivacyTermsExam Disclaimer

Appearance

Operator Master is independent and is not affiliated with WPI, PSI, ABC, the Washington State Department of Ecology or any other state or provincial certification agency.

Wastewater math

MGD to GPD Conversion for Wastewater Operators

Converting million gallons per day to gallons per day.

The formula

Formula

  • Convert MGD to gpd

    gpd = MGD × 1,000,000

    WPI Formula/Conversion Table (2023), Printed page 9 of 10, Conversion Factors

Open the Formula Sheet→

Worked example

Step by Step

A wastewater flow is 1.2 MGD. What is the same flow in gallons per day?

  1. What is the question asking for?

    Report the same flow in gallons per day (gpd).

  2. Which value and unit matter?

    The given flow is 1.2 million gallons per day (MGD).

  3. What does the M in MGD mean?

    M means one million. One MGD represents one million gallons per day.

  4. How should the units cancel?

    Multiply by 1,000,000 gpd for every 1 MGD. MGD cancels, leaving gpd. Now do the multiplication yourself.

Answer: 1,200,000 gpd

Practice

Try It Yourself

Practice this math in the Math Center, with hints and worked steps.

Practice Unit Conversion

More formulas

Other Wastewater Math

  • Detention Time Formula
  • Pounds Loading Formula
  • Chemical Feed Rate Formula
  • Percent Removal Formula
  • Channel Flow Rate Formula
  • Tank Area Formulas

Operator Master is independent. It is not affiliated with WPI, PSI, ABC, the Washington State Department of Ecology or any other state or provincial certification agency, does not reproduce live exam content and does not guarantee a passing score.