How to read minute charts: start with the time of day
Minute charts draw candles in short units such as 1, 5 or 15 minutes. If a daily candle squeezes a whole day into four values, open, high, low and close, a minute chart spreads out when and how price moved within that day. The biggest difference between stock and crypto minute charts is that a stock trading day has a start and an end. The moment the regular session opens, news and orders that piled up overnight come in at once; trading loosens during the day; and as the close approaches, orders to settle the day's positions crowd in again. Because of this rhythm, a 5-minute candle just after the open and one around midday come out completely different in size and volume, and that difference is mostly an ordinary product of market structure, not a special signal. So when reading a minute chart, first check which part of the day the candle you are looking at belongs to. This article uses Korean stocks as the baseline for the character of each part of the day, then sums up what to watch when viewing US stocks in Korean time and how stock minute charts differ from crypto.
Definition and formulas: candle timestamps and session VWAP
A minute candle bundles the first, highest, lowest and last prices of the fills in a set number of minutes, along with the volume. Most charts label a candle with its start time, so a 5-minute candle marked 09:05 covers fills from 09:05 to just before 09:10. Some tools label the end time instead, so checking once what time the first candle of the session shows will save confusion. A line often laid over minute charts is the session VWAP (volume-weighted average price). It multiplies each candle's typical price by its volume, sums from the open, and divides by the total volume over the same period, showing roughly where the average price of the day's traded volume sits. TradingView's common default uses (high + low + close) ÷ 3 as the typical price and restarts the calculation each time the session changes. Early in the session few candles have been summed, so VWAP hugs price closely; as time passes it grows heavier and moves less.
- Minute candle = open, high, low, close and volume over a set number of minutes
- Typical price = (high + low + close) ÷ 3
- Session VWAP = Σ(typical price × volume) ÷ Σvolume, accumulated from the open
- When the session changes, the accumulation starts over
Just after the open: the roughest stretch of the day
The Korean regular session opens at 9 a.m., but for the 30 minutes from 8:30 a call auction collects orders and fills them at a single price at 9:00. So the first minute candle at 9:00 carries heavy volume from orders accumulated overnight being filled at once, and gaps that start away from the previous close form at this moment too. The first few tens of minutes are the process of pricing in the overnight US market, exchange rates and company news, so candles are large and direction changes often. Big candles and heavy volume in this stretch are the most common sight of the day, so measured against the previous afternoon's minute candles they look special every time. Indicators such as moving averages and RSI also simply join the previous day's last candles to today's first ones, so on a day with a big gap they tend to bend sharply or hit extreme values in the first candles. That bend is just overnight news arriving all at once, not a sign that the intraday flow has changed. Many people use the high and low set in the first stretch as reference lines for the day, but this too is an observational reference that guarantees no result.
Around midday: the quiet hours
The Korean regular session has no lunch break, but on many days trading thins noticeably from roughly 11:30 a.m. to around 1 p.m. Candle bodies shrink, volume bars drop, and price often moves up and down in a narrow range. With few participants in this window, a handful of orders can push slightly past support or resistance and come back, and signals such as golden or dead crosses on short minute charts flip quickly. This is also the stretch where the general rule of suspecting low-volume breakouts as false breakouts fits best. Conversely, if volume suddenly picks up during the quiet hours and price leaves its range, that is a reason to check for intraday news or a move across the whole sector. Markets with a lunch break, such as Japanese stocks, show a gap in minute candles between the morning and afternoon sessions, and the first afternoon candle sometimes opens with a small gap. US stocks also tend to slacken around local noon, which corresponds to roughly 1 to 3 a.m. Korean time during daylight saving.
Near the close: orders crowd in again
After 2 p.m., orders to close or adjust positions within the day increase again, so minute candles grow and volume revives. Korean stocks hold a closing call auction from 3:20 to 3:30 p.m.; for those ten minutes orders only accumulate with no fills, and at 3:30 they are filled at a single price. On a minute chart, the candles after 3:20 are therefore empty or run flat, and then one candle carrying heavy volume prints at the end. That final fill becomes the day's close, and it is especially large on days when index-tracking money or institutional orders move on the closing price. On days when index constituents change, or on futures and options expiry days, volume near the close can be far larger than usual. US stocks also have a closing auction that fills pooled orders at once at the 4 p.m. local close, so the last minute candle usually carries unusually heavy volume. Rather than reading hurried moves near the close as a preview of the next day's direction, it is safer to first see them as the result of orders gathered to wrap up the day.
Read US stocks in Korean time
The US regular session runs from 9:30 a.m. to 4 p.m. New York time. In Korean time that is 10:30 p.m. to 5 a.m. the next day while daylight saving applies, from the second Sunday of March to the first Sunday of November, and 11:30 p.m. to 6 a.m. the rest of the year. So the rough stretch right after the open arrives late at night in Korea, and the closing auction comes before dawn. Chart tools differ on whether the time axis uses the exchange's local time or the viewing device's time zone, so the same candle can be labeled 09:30 or 22:30. Some screens, like this site's world markets page, draw in the device's time zone, so check the time zone note on the screen first. There is extended-hours trading before and after the regular session, and when earnings or economic data come out then, the first regular-session candle opens far away. Whether extended hours are included also differs by tool, and on a chart that draws only the regular session that move shows up only as a gap on the first candle. Also remember that in the weeks when daylight saving changes, the opening time in Korean time shifts by an hour.
What looks different in crypto and stocks
Crypto trades 24 hours without a break, so its minute charts have no open or close, and overnight news rarely arrives all at once as a gap. Instead, busy hours within the day are distinct. Participants in Asia, Europe and the US come in one after another, and crypto minute candles often grow when the US stock market opens or when US economic data is released. In quiet times such as weekends and late nights the book is thin and minute candles easily grow long wicks. The daily candle and the day's reference for crypto usually roll over at 00:00 UTC, 9 a.m. Korean time, so when using session VWAP or the day's high and low, check that reference time. Korean stock minute charts, even for large caps such as Samsung Electronics or SK hynix, are shaped by the time-of-day rhythm above, the call auctions and the volatility interruption (VI). When price moves more than a set amount in a short time, VI kicks in and switches trading to a single-price auction for two minutes, during which minute candles break off or fills crowd into one candle. US indexes and large tech stocks show clear volume concentration right after the open and right before the close.
- Crypto: no open or close, but busy hours and a thin weekend book
- Crypto: the daily candle and day reference usually roll over at 9 a.m. Korean time
- Korean stocks: call auctions and VI leave candles empty or crowd fills into one
- US stocks: volume concentrates heavily after the open and in the closing auction
Common misconceptions
First, reading heavy volume on early minute candles as a special signal. That time of day naturally has the most trading, so for a fair comparison volume should be measured against the same time on the past few days, not against the average of the candles just before. Second, giving minute-chart indicator signals the same weight as daily signals. A 5-minute RSI entering oversold only measures the last hour or so of movement, so it can happen several times a day regardless of the daily trend. Third, taking a sharp bend in indicators on the first candles of a gap day as a change in the flow. As noted above, that comes from calculating across yesterday's and today's data stitched together. Fourth, treating minute candles that stop during the closing auction as a halt in trading. Orders are accumulating and get filled all at once at the end. Fifth, assuming the quotes on screen are real time. Depending on the source, stock quotes can arrive a few minutes late, so the last candle may not be this very moment.
Reading it on a live chart
Because minute candles are short, the forming candle carries a lot of weight in the whole chart. If a 5-minute candle started one minute ago, its volume and body hold only part of five minutes, and the moving averages or RSI computed on it change with every fill. Crosses or oversold entries that appear mid-candle often vanish when the candle closes, so confirm signals on closed candles. Even when viewing 15-minute and hourly candles together, as on this site's stock signals tool, remember that the last hourly candle is confirmed only after all four 15-minute candles inside it have closed. For stocks, even after the market closes, the chart's last candle can change to reflect the closing auction fill, or the data source can tidy up late and correct values a few minutes later. To treat the minute chart right after the close as the day's final picture, check again a little later. When viewing US stocks at night, first match the screen's time zone and daylight saving status so that you do not mistake some other candle for the first candle of the session.
A practical checklist
When reading minute charts, first checking which part of the day the current candle falls in avoids most time-of-day mistakes. Go through the list below, and if an item raises a flag, give less weight to what you read from the minute chart.
- Check whether the chart's time axis uses exchange time or device time
- See whether the current candle is in the open, midday or near the close
- Compare volume with the same time of day over the past few days
- On gap days, filter out indicator bends on the first candles
- Mark exceptional windows such as call auctions, VI and the closing auction
- Confirm minute-chart signals on closed candles, together with the daily trend
Limits and disclaimer
Minute charts show only short movements within a day, and the character of each time of day varies from day to day. Quotes can be delayed depending on the source, and the same day looks different depending on whether extended hours are included and how the time axis is drawn. The features of the open, midday and close described here are commonly observed tendencies, not rules that hold every time, and following minute-chart signals guarantees no result. Minute charts are closer to a magnifying glass for looking at details within the larger flow seen on daily and weekly charts, and they cannot replace that larger flow. This article explains how minute charts are built and how to read them, and it does not recommend buying or selling any stock. Shorter candles tend to mean more trades and more costs such as commissions and taxes, so remember that trading decisions and responsibility for their results are your own.
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