How do I calculate a weighted average?

Weighted mean = Σ(value×weight) ÷ Σweight. With coursework 90 at 30% and an exam 85 at 70%: (90×3 + 85×7) ÷ 10 = 86.5.

When should I use the geometric mean?

For growth rates and investment returns — it is the nth root of the product of the values, and it requires all values to be positive.

When is the harmonic mean right?

For average speeds or unit prices, where the quantities share a numerator but differ in the denominator: n ÷ Σ(1/xᵢ).

Can I leave a weight out?

Yes — a line with only a value is treated as having weight 1.

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⚖️Average Calculator - Mean, Weighted, Geometric and Harmonic

Paste a set of numbers for the arithmetic mean, median, mode, geometric and harmonic means and root mean square. Switch to weighted mode and write “value weight” on each line to compute a weighted average, with every product and its share listed — ideal for coursework and exam weightings.

Free · No sign-up · Runs in your browserLast updated: 2026-10-26

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How to use Average Calculator

1Choose simple or weighted average
2Paste the data; in weighted mode write “value weight” per line, e.g. 90 3
3Read the averages, with a breakdown below in weighted mode

FAQ

How do I calculate a weighted average?: Weighted mean = Σ(value×weight) ÷ Σweight. With coursework 90 at 30% and an exam 85 at 70%: (90×3 + 85×7) ÷ 10 = 86.5.
When should I use the geometric mean?: For growth rates and investment returns — it is the nth root of the product of the values, and it requires all values to be positive.
When is the harmonic mean right?: For average speeds or unit prices, where the quantities share a numerator but differ in the denominator: n ÷ Σ(1/xᵢ).
Can I leave a weight out?: Yes — a line with only a value is treated as having weight 1.