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CHEMISTRY / NUCLEAR CHEMISTRY

Average Atomic Mass Calculator

Calculate weighted average atomic mass for a two-isotope sample. Review the equation, substituted values, assumptions, and result in one guided chemistry workspace.

  • 01 Calculated in this tab
  • 02 Values stay in this browser tab
  • 03 Use boundary

Conversion input

Known value

Filter by unit name, symbol, or code. Your current selections remain available.

Equation inputs

Preparing the calculator...

Use boundary

Calculation path

Calculate weighted average atomic mass for a two-isotope sample. The page evaluates the displayed equation from your supplied values and presents both symbolic and substituted KaTeX working so the arithmetic can be checked.

Calculation path

m_avg=(m1p1+m2p2)/100

What you provide

What you provide

  • First isotope mass expressed in u, using the same scenario as the other inputs
  • First isotope abundance expressed in %, using the same scenario as the other inputs
  • Second isotope mass expressed in u, using the same scenario as the other inputs
  • Second isotope abundance expressed in %, using the same scenario as the other inputs

What you receive

What you receive

  • Average atomic mass in u from the stated equation
  • A symbolic formula plus substituted working with your values
  • Visible assumptions, field guidance, and an authoritative learning reference

Use boundary

Choose the maximum decimal places shown. This does not increase source accuracy.

The sample contains only the two entered isotopes and abundances are representative percentages.

Use internally consistent units and retain extra precision when carrying the result into another calculation.

Reviewed reference factors

Reviewed reference factors

OpenStax Chemistry 2e

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