Indicators · Trend · live Bitcoin example
Moving averages explained: SMA vs EMA, and how traders use them
A moving average draws one smooth line through a bumpy price chart. It hides the daily noise so you can see which way the market has really been going. It is the most used indicator in the world – and the building block of many others, from MACD to Bollinger Bands.
What Bitcoin’s moving averages say right now
Worked out from real Bitcoin candles and refreshed every 30 minutes. It describes what already happened – not what will happen next.
Moving averages on the live Bitcoin chart
The live Bitcoin chart with only moving averages on: the coral line is the 20-candle average and the blue line is the 50-candle average.
What are moving averages?
A moving average is the average closing price of the last N candles, updated every time a new candle closes. On a daily chart, a 50-day moving average is the average of the last 50 daily closes. Tomorrow the oldest day drops out and the newest one comes in – that is why it “moves”.
There are two main kinds. The SMA (simple moving average) gives every candle the same weight. The EMA (exponential moving average) gives more weight to the most recent candles, so it reacts faster when the price changes.
Neither one is better. The SMA is smoother and calmer, which helps with long-term trends. The EMA turns faster, which helps short-term traders but also means more false turns. Many traders use EMAs for short lengths (like 9, 20 or 21) and SMAs for long ones (50 and 200).
Moving averages always lag: they are made of past prices, so they turn after the price turns. That is not a flaw – it is the price you pay for a smooth line.
Where it comes from: Moving averages are much older than modern charting. Averages of prices were used by traders and statisticians in the early 1900s, and they became a core trading tool in the second half of the century. Nobody owns them – which is one reason everyone uses them.
How moving averages are calculated
The SMA is just an average. The EMA adds one small twist: it mixes today’s price with yesterday’s EMA.
- SMASum of N closes ÷ NEvery candle counts the same.
- EMA weightk = 2 ÷ (N + 1)For a 5-candle EMA, k = 2 ÷ 6 ≈ 0.33.
- EMAEMA = old EMA + k × (close − old EMA)Moves part of the way toward the new price each candle.
| Last 5 closes | 10, 11, 12, 13, 14 |
|---|---|
| SMA = (10 + 11 + 12 + 13 + 14) ÷ 5 | 12 |
| Yesterday’s 5-candle EMA | 11.5 |
| Weight k = 2 ÷ 6 | 0.33 |
| EMA = 11.5 + 0.33 × (14 − 11.5) | ≈ 12.33 |
Both averages lag behind the latest price of 14, but the EMA (12.33) is closer to it than the SMA (12). That is the whole difference: the EMA leans toward the newest candles.
How to read moving averages
The pictures are simple example shapes, so the idea is easy to see. Real charts are messier.
After a jump in price, the EMA catches up faster than the SMA. Example drawing, not real data. Price above or below
Price above a rising moving average: the trend for that period has been up. Price below a falling one: the trend has been down. Price going back and forth across a flat line: no clear trend.
Golden cross: the faster average (50) crosses above the slower average (200). Example drawing, not real data. Golden cross and death cross
When the 50-day average crosses above the 200-day average, it is called a golden cross. When it crosses below, a death cross. They are famous because they are easy to see – but they happen long after the price has turned, and they often give false alarms in sideways markets.
Moving support and resistance
In a trend, the price often pulls back to a moving average and bounces. Many traders watch the 20 or 21 EMA in fast trends and the 50 or 200 in slower ones. These are zones, not exact lines.
The slope
The direction of the line matters as much as the price. A rising average with the price slightly below it is different from a falling average with the price slightly below it.
Common mistakes beginners make
Almost everyone makes these at first. Knowing them saves a lot of frustration.
- Expecting the price to stop exactly on the lineAverages are zones. Price often pokes through a little before bouncing – or breaks through for good.
- Trading every crossingIn a flat market the price crosses the averages again and again. Crossings mean more when there is a trend.
- Using too many averagesSeven lines on one chart make everything look like a signal. Two or three are plenty.
- Forgetting the lagA golden cross can arrive after a large part of the move. It confirms what happened; it does not reveal what comes next.
Settings most people use
The numbers in brackets you see on charts – explained in plain words.
- Short9, 20 or 21 (often EMA)Short-term trend. Popular with swing traders.
- Medium50The medium trend – about two to three months of daily candles in stocks, seven weeks in crypto.
- Long100 and 200The long-term trend. The 200-day is the most watched line in markets – it has its own lesson.
How to use moving averages (for beginners)
Six small steps. None of them tells you to buy or sell – they help you read the chart.
- 1Start with one lineAdd the 50-day average. Is the price above it or below it?
- 2Check the slopeRising, falling or flat? That tells you the trend’s direction.
- 3Add a second lineAdd the 20 or the 200. Are they stacked in order?
- 4Watch pullbacksIn a trend, see whether dips stop near an average.
- 5Note the crossesGolden and death crosses confirm a change that already started.
- 6Check momentum tooUse MACD, which is built from two EMAs, to see if the trend is speeding up or slowing down.
See moving averages on other markets
Indicators work the same way on crypto, gold, currencies and stocks. Open any live Kumo chart and press the button.
Learn next
These go well together with this lesson.
- EMA 200The famous long-term trend line: above it the big picture is up, below it down.
- MACDTwo averages chasing each other – it shows when a move speeds up or slows down.
- Bollinger BandsA stretchy band around the price that shows normal and unusual moves.
Free Kumocast tools:Bitcoin 200-week moving average
Moving averages FAQ
What is the difference between SMA and EMA?
An SMA gives every candle the same weight. An EMA gives more weight to recent candles, so it reacts faster to new moves. The EMA is closer to the current price; the SMA is smoother.
Which moving average is best?
There is no single best one. The 20, 50 and 200 are the most watched, and many traders use EMAs for short lengths and SMAs for long ones. The best average is one you use the same way every time.
What is a golden cross?
When the 50-day moving average crosses above the 200-day moving average. It shows the medium-term trend has moved above the long-term trend. Its opposite is the death cross.
Do moving averages work for crypto?
They work the same way on any chart. Because crypto trades every day, a 50-day average covers 50 calendar days, while in stocks it covers about ten weeks of trading days.
Why do moving averages lag?
Because they are made of past prices. A 50-day average still includes prices from seven weeks ago, so it turns only after the price has already turned.
What moving average do day traders use?
Many use short EMAs like the 9 and 21 on 5-minute or 15-minute charts, and keep an eye on the daily 50 and 200 for the bigger picture.
All indicator lessons
Free, plain-word lessons, each with a live Bitcoin example.
- Support and resistanceThe price “floors” and “ceilings” where buyers or sellers stepped in before.
- RSIA 0–100 score of how hard a market has been bought or sold lately.
- VolumeHow much was traded – it tells you how many people stand behind a move.
- EMA 200The famous long-term trend line: above it the big picture is up, below it down.
- MACDTwo averages chasing each other – it shows when a move speeds up or slows down.
- Bollinger BandsA stretchy band around the price that shows normal and unusual moves.
- Stochastic oscillatorWhere today’s price sits inside its recent high–low range, from 0 to 100.
- Ichimoku cloudThe Japanese “cloud” chart – Kumo’s namesake – showing trend, levels and momentum at once.
Written by
Alex Wu
Crypto, DeFi, perps and FX · driven by data
Alex designed the Kumocast model behind these signals, sets its rules, reviews its accuracy record and updates the methodology whenever the model changes. Signals are refreshed every 30 minutes with live market data.