The Bitcoin Rainbow Chart and Moving Averages: What They Show and Why They Don't Predict

Key takeaways

• The Bitcoin rainbow chart plots the price history on a logarithmic scale, with colored bands drawn around a curve fitted to past prices. The band labels are branding, not measurements.
• A moving average, such as the 200-week average, is the average price over a rolling window. It smooths short-term noise and lags behind the latest price.
• Both tools describe the past. A curve can be fitted to history in many ways, only a few market cycles exist to test it, and nothing in either chart explains why the price should follow it.
• They can add context to a long price history. They are a weak basis for deciding when to buy or sell.
• This article quotes no prices, no band levels and no forecasts, because those change and because no chart can promise them.

What is the Bitcoin rainbow chart?

The Bitcoin rainbow chart is a long-term price chart with a smooth curve running through the price history and colored bands stacked above and below it. Each band carries a label, usually something that sounds like a mood or an instruction, running from “cheap” at the bottom to “overheated” at the top.

The idea took shape on online forums, where a user posted a curve fitted to Bitcoin’s price history around 2014 and others later added colored bands to show how far the price sat from that trend. Several people have since built their own versions, with different curves and different bands. That is why two rainbow charts can disagree about where the price sits today.

At least some of the best-known versions carry a disclaimer that the chart is not investment advice and cannot predict the price. It is worth taking that caveat at face value.

Why is the chart drawn on a logarithmic scale?

A logarithmic scale spaces the price axis by percentage change instead of by equal amounts, so every doubling covers the same height on the chart. Take invented round numbers for illustration. On an ordinary linear axis, going from 10 to 20 takes the same height as going from 90 to 100. On a logarithmic axis, going from 10 to 20 takes the same height as going from 100 to 200, because each is a doubling.

Bitcoin’s price has moved across a very wide range since 2009. On a linear chart the early years would be squashed flat against the bottom edge and impossible to read. A log scale keeps every era visible, and steady percentage growth shows up as a straight line.

It also has a side effect. At high price levels, a large fall in dollar terms can look like a small step on a log chart. If you read the chart, judge moves by percentage and by what they would mean for your own money.

How is the curve fitted?

The curve comes from regression, a method that picks a smooth formula lying as close as possible to the past prices. The colored bands are copies of that curve shifted up or down by amounts the chart’s maker chooses.

Many formulas fit the same history about equally well, which is why versions differ. Some versions also re-fit the curve as new prices arrive, so the bands can move after the fact. A curve chosen by looking at prices that have already happened describes history by construction. Matching the past is the one thing it was built to do, so a good match proves little about the future.

What is a moving average?

A moving average is the average of the most recent prices over a fixed window, recalculated each time a new price arrives. The window slides forward: the oldest price drops out and the newest enters.

Here is a worked example. The numbers are invented for illustration and are not Bitcoin prices. Say a five-week average uses these weekly closing prices, in made-up units.

In week 6 the price jumps from 14 to 20, a rise of 6, but the average moves from 12 to 14, a rise of 2. That is both the use and the limit of the tool. The average calms the noise, and it also reacts late: after a sharp turn it keeps pointing the old way for a while.

What is the 200-week moving average?

The 200-week moving average is the average of the weekly prices over the last 200 weeks, which is 1,400 days, a little under four years. The window is so long that the line moves slowly and ignores most short-term swings.

For Bitcoin, that window covers most of the time between one halving and the next, which is why some people treat the line as a long-term reference. Watchers look at whether the price is above or below it and how far away it is. Shorter windows, such as the 50-day and 200-day averages, are used for shorter trends, and the 200-week line should not be confused with the 200-day one.

This article does not say whether the price has respected the 200-week line in the past. Bitcoin has had only a few full cycles, and a handful of observations cannot show a rule. Anyone who tells you the line is a floor, or that a crossing signals the next move, is describing past episodes as if they were a law.

How do traders use these charts?

People use them to see where the current price sits compared with the long-run trend. Some treat a price far above the curve as stretched and a price below the 200-week average as cheap, and some build trading rules around crossings. Others use the charts as a conversation starter or a rough risk dashboard.

None of these uses has been shown to work reliably in advance. A chart tells you where the price is relative to a line. It does not tell you where the price is going. When many people watch the same line, it can influence behavior around it, but that is a different thing from the line having predictive power.

Why can’t these charts predict the price?

Neither tool is a forecast, and there are several separate reasons.

The fit looks backward. Both the rainbow curve and the moving average are calculated from prices that already happened. A formula that matches the past tells you the past was matched.

There are few cycles. Bitcoin has gone through only a few full boom-and-bust periods, each under different conditions. US spot Bitcoin ETFs began trading in January 2024, for example, which added a new kind of buyer. A pattern seen in a handful of events can be coincidence, a point covered in Why Is Bitcoin So Volatile?

The bands are chosen after the fact. The number, width and colors of the bands are the maker’s decisions, and nobody can test them. A band labeled “cheap” does not mean the price cannot fall further or stay there for years.

There is no cause-and-effect model. Nothing in the chart explains why the price would return to the curve. It leaves out demand, interest rates, regulation, news, leverage and the other drivers listed in Why Does the Bitcoin Price Fall? The halving cuts the amount of new supply, as What Is the Bitcoin Halving? explains, but how the price responds is not something a fitted curve can tell you.

The labels are marketing. Words such as “buy” or “sell” on a band turn a statistical shape into something that reads like advice. The chart does not know your goals, your time horizon or your finances.

How can you use these charts sensibly?

Treat them as history lessons and not as signals. They can show how wide Bitcoin’s range has been, how long periods of decline and recovery have lasted, and how far the price can sit from any trend. That can make the claim that “this time is different” or “it only goes up” easier to question.

Before relying on any chart, ask a few questions:

1. Who built it, and how is the curve calculated?
2. Is it re-fitted as new data arrive, so that the past bands change?
3. Was it tested on prices that were not used to build it?
4. Does the maker claim it predicts anything, and what result would count as it being wrong?
5. What is my own plan, including the time horizon and the amount I could lose without harm?

Question 5 matters most. Some people prefer a fixed schedule over trying to time the market, an approach covered in What Is Dollar-Cost Averaging? without any claim that it beats other methods. The wider set of questions to ask before putting money in is in Is Bitcoin a Good Investment? If the basics are still new, the Start Here path builds them in order.

Current chart values are not quoted here because they change every day. Chart sites and exchanges show them live. A qualified financial professional can help you place any chart in the context of your own situation.

Where to go next

• Why Is Bitcoin So Volatile? And Can Anyone Predict a Crash?: why the price swings and why the four-year cycle is not a law.
• Why Does the Bitcoin Price Fall? What Moves It and What Doesn’t: the drivers behind drops, and how to read one.
• Is Bitcoin a Good Investment? How to Think About It Without Hype: questions to ask before deciding.
• What Is the Bitcoin Halving? Dates, History and What It Changes: what the event does and does not change.