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Double line graph maker

Plot two trends on the same axes and see where they diverge, cross or move together. Paste a time column and two value columns; add more columns for a multiple line graph.

First row = headers. First column = categories; every extra column becomes a series. Paste straight from a spreadsheet.

Labels & options
Average high temperatureTwo cities, °C (illustrative data)City ACity B51015202530JanFebMarAprMayJunJulAugSepOctNovDecJan · City A: 6Feb · City A: 7Mar · City A: 11Apr · City A: 15May · City A: 19Jun · City A: 23Jul · City A: 26Aug · City A: 25Sep · City A: 21Oct · City A: 16Nov · City A: 10Dec · City A: 7Jan · City B: 14Feb · City B: 15Mar · City B: 17Apr · City B: 19May · City B: 22Jun · City B: 25Jul · City B: 27Aug · City B: 27Sep · City B: 25Oct · City B: 22Nov · City B: 18Dec · City B: 15Month°C

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How to make a double line graph

  1. First column: the time or order (months, years, trials). Next two columns: the two series, with a header naming each.
  2. Paste the table; each column becomes a line with its own colour and legend entry.
  3. Untick “Start axis at zero” to zoom in on the change (say so in the subtitle).
  4. Download PNG or SVG, or copy a share link.

Reading a double line graph

Look for three things: which line is higher, whether the gap is widening or narrowing, and where the lines cross — that’s the point where the two series swap places. Because both lines share one y-axis, both series must use the same unit. If they don’t (say, temperature and rainfall), make two separate charts rather than using two different axes, which can suggest any relationship you like.

Two lines or many?

Each extra value column adds a line, so the same tool makes a multiple line graph. Past four or five lines, highlight the one that matters with the “Single hue” palette or split the chart. If the lines are parts of a total, a stacked area chart shows the total too.

Questions

How do you make a double line graph?

Make three columns: time, series 1, series 2, with a header row. Paste them here and both lines are drawn on the same axes with a legend.

What is a double line graph used for?

Comparing how two related quantities change over the same period, such as sales in two stores or temperatures in two cities.

Can I add a third line?

Yes. Add another value column. Every column after the first becomes a line.

What if my two series have different units?

Draw them as two charts, or convert both to an index (e.g. first value = 100) so they share a scale.

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