Area chart

A line chart with the space under it filled, to emphasize how much volume a trend carries.

8 area chart examples

Cumulative revenue

Revenue accumulating through the year.

Filling under the line is only honest when the area means something. Here it does: the shaded region is money collected to date.

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Signups over time

New accounts per month, filled to show volume.

An area chart says 'how much', a line says 'which way'. For a volume metric that starts at zero, the filled version reads faster.

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Storage growth

Terabytes stored as the product scales.

Infrastructure planning charts are areas because the quantity is a volume you are paying to hold, not a rate.

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App downloads

Installs per month after launch.

The launch spike, the trough, and the recovery. Filled, the trough looks like the lost volume it actually is.

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Heating season consumption

Consumption across a heating season.

Metered quantities accumulate under the curve, so the area under this chart is literally the bill.

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Cash runway

Bank balance shrinking towards the next round.

A shrinking filled area is uncomfortable to look at, which is the correct response to this particular chart.

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Content published

Articles shipped per month.

Small integer counts still read well as an area when the point is total output rather than month-to-month variation.

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API calls

Millions of requests served per month.

Usage-based pricing lives on this chart. The filled area is what the invoice is calculated from.

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