Time, Tick, Volume, Range or Renko: Which Bars for Which Job

Every chart answers one question before you look at it: when does a bar end? A 5-minute chart ends a bar when the clock says so. A 500-tick chart ends it after 500 trades. A range chart ends it when price has moved far enough. That one rule decides what the chart shows you, what it hides, and how every indicator on it behaves.

Most traders pick a bar type early and never revisit it. That is a missed opportunity, because each type is good at a different job. This article explains how each one is built, what it is good and bad at, and how to choose among them for the work you actually do.

Why the Bar Rule Matters

Markets do not move at a steady pace. ES at the regular-session open and ES at lunchtime are two different markets: the same contract, the same tick size, but many times more trades per minute at the open. A time-based chart gives both periods the same space. A chart built on activity gives the busy period more bars and the quiet period fewer.

Neither is wrong. They answer different questions:

• Time bars ask "what happened in each slice of the clock?"
• Activity bars (tick and volume) ask "what happened in each slice of trading?"
• Price bars (range and Renko) ask "what happened in each slice of price movement?"

The rest of this article goes through each one.

Time Bars

A time bar covers a fixed stretch of the clock: 1 second, 1 minute, 5 minutes, an hour, a day. Its open is the first trade in the window, its close the last, its high and low the extremes in between.

Good at:

• Comparing across days. The 10:00 bar today lines up with the 10:00 bar yesterday. Session-based tools (opening range, initial balance, time-of-day studies) are natural on time bars.
• Shared reference. Everyone's 5-minute chart has the same bars. Levels and patterns other traders talk about are usually on time bars.
• Indicators with time meaning. A 20-bar average on a 5-minute chart is the last 100 minutes, a quantity that means the same thing on every day.

Weak at:

• Uneven activity. At the open a single 1-minute bar can hold a huge share of the hour's volume; at lunch a bar can hold almost nothing. Busy bars squash a lot of action into one candle, and quiet bars fill the chart with noise.
• Gaps in quiet periods. On thinly traded products or hours, a time window can pass with few or no trades, leaving bars that say little.

Tick Bars

A tick bar closes after a fixed number of trades: a 500-tick bar holds 500 trades, then a new bar starts. "Tick" here means a trade, not a price increment.

Good at:

• Adapting to activity. When trading is fast, tick bars form quickly and show more detail; when it is slow, they form slowly and show less noise.
• Scalping in busy markets. Many short-term traders like tick charts at the open because a pattern unfolds over the same number of trades whether it takes 30 seconds or 3 minutes.

Weak at:

• Trade count is not size. A one-lot and a hundred-lot both count as one trade. A tick bar full of one-lots and one full of large orders look the same.
• Feeds count trades differently. What arrives as one "trade" depends on how the data is reported. A single aggressive order that fills against several resting orders may arrive as one trade or several, depending on the feed. Two 500-tick charts from different data sources can show different bars for the same market.
• No time alignment. Bars don't line up with the clock, so time-of-day comparisons are harder.

Volume Bars

A volume bar closes after a fixed number of contracts have traded: a 5,000-volume bar holds 5,000 contracts.

Good at:

• Equal participation per bar. Every bar represents the same amount of trading, which makes bars more comparable than tick bars when trade sizes vary.
• Smoothing quiet periods. Like tick bars, volume bars slow down when the market does.

Weak at:

• Large prints. A single fill larger than the bar size has to go somewhere. Some charts split it across bars; others let one bar run over. Know which your chart does.
• Volume indicators lose meaning. A volume histogram under a volume chart shows the same number on every bar, because that's the rule that made them.

Worked Example: How Many Bars an Hour?

The numbers here are invented and round, for illustration only. Say ES trades 20,000 contracts a minute in the first minutes of the regular session and 1,500 a minute around lunch. On a 5,000-volume chart:

• At the open: 20,000 ÷ 5,000 = 4 bars per minute, a new bar every 15 seconds.
• At lunch: 5,000 ÷ 1,500 = about 3.3 minutes per bar.

On a 1-minute chart, both periods get one bar per minute. On the volume chart, the open gets about 13 times as many bars as the same stretch of lunch. That difference is the whole point of the bar type: more resolution when the market is doing more.

Range Bars

A range bar closes when its high and low are a fixed distance apart. On a 16-tick range chart for ES (4.00 points), a bar keeps building until its range reaches 4.00 points, then closes and a new bar begins.

With invented prices: a bar opens at 5,000.00. Price trades up to 5,002.50, back to 4,999.00, then up to 5,003.00. Its range is now 5,003.00 − 4,999.00 = 4.00 points, so it closes at 5,003.00, and the next bar opens at the next trade.

Good at:

• Equal price movement per bar. Every bar spans the same range, so noise inside a range doesn't create new bars. A market chopping in a 2-point range on a 16-tick chart builds one slowly forming bar, not a dozen messy ones.
• Clear trends. In a directional move, range bars march in steps, which some traders find easier to read.
• Fixed-size thinking. If your stop is about one bar's range, the chart shows you directly how far that is.

Weak at:

• The close is predictable. Every bar closes at its high or low, by construction. Patterns that rely on where a bar closes within its range mean less.
• Time disappears. A quiet hour may be one bar, a fast minute ten. Time-of-day tools don't line up.
• Range size must suit the product. 16 ticks on ES is 4.00 points ($200 per contract at $12.50 a tick). 16 ticks on NQ is also 4.00 points ($80 at $5.00 a tick), but NQ usually covers far more points in a session, so the same setting builds many more bars. On CL, 16 ticks is $0.16 per barrel ($160 at $10.00 a tick). Set the range per product.

Renko Bars

A Renko chart draws "bricks" of a fixed price size. A new brick is added only when price moves a full brick beyond the last one. Time and volume play no part.

With invented numbers and 2.00-point bricks on ES, starting from 5,000.00: price rises to 5,006.25. That adds bricks at 5,002.00, 5,004.00 and 5,006.00. The extra 0.25 adds nothing yet. If price then falls, many Renko implementations require a move of two bricks against the trend before a reversal brick is drawn: in this case a drop to 5,002.00 for the first down brick. The exact reversal rule varies between charts, so check the one you use.

Good at:

• Filtering noise. Small moves don't add bricks, so trend structure stands out clearly.
• Visual trend-following. Runs of same-color bricks make trends and reversals easy to see at a glance.

Weak at:

• Brick prices aren't trades. A brick's open and close are brick boundaries, not necessarily prices that traded. Highs and lows inside the brick are usually hidden. An entry or stop "at the brick close" in a backtest may be at a price the market skipped.
• Late signals. A reversal needs at least one and often two full bricks of movement, so the chart confirms a turn after a significant part of it has happened.
• Lost detail. Wicks, fast spikes and tests of levels can vanish entirely.

Renko is best treated as a view for reading structure, with entries and stops planned against real prices on another chart.

Indicators Change Meaning With the Bar Type

An indicator counts bars, not minutes. That changes what its settings mean:

• A 20-period average on a 5-minute chart covers 100 minutes.
• A 20-period average on a 5,000-volume chart covers 100,000 contracts, which might be 5 minutes at the open and an hour at lunch.
• A 20-period average on a range or Renko chart covers 20 steps of price movement, however long they took.

The same is true of oscillators, bands and anything else defined by a number of bars. Moving an indicator from a time chart to an activity chart without rethinking its length changes what it measures.

Session-based tools behave differently again. A session VWAP, for example, is defined by the session and the trades in it, not by the bars, so it should be close to the same line on any bar type when it is built from the same trades. Session levels such as the prior day's high are prices, so they stay fixed. Bar-counted tools move; session-defined tools mostly don't.

Data Matters: Bars Built From Trades

Time bars can be built from minute data. Tick, volume, range and Renko bars cannot be built exactly without knowing every trade, in order. A 500-tick bar needs the 500 trades; a range bar needs every price move inside the bar.

That has two practical consequences:

• Your data connection decides what you can draw. If your market data connection sends every trade, trade-driven bars can be built precisely. If it sends only bars, a chart can either refuse to draw trade-driven bars or approximate them from minute bars. An approximation can look plausible and still put bar boundaries in different places from the real thing.
• History depth depends on trade history. Loading several days of 500-tick bars means loading several days of trades, which is far more data than the same days in 1-minute bars. How far back you can see trade-driven bars depends on how much trade history your data source provides.

If you backtest or review on trade-driven bars, make sure they are built from real trades, not reconstructed from minute bars.

Choosing: Which Bars for Which Job

There is no best bar type. There are bar types suited to tasks:

Job	Often a good fit	Why
Session planning, levels, time-of-day study	Time (5-min, 15-min, 30-min)	Lines up with the clock and with other traders' charts
Fast scalping at the open	Tick or volume	More bars when the market is busy, fewer when quiet
Comparing activity fairly across the day	Volume	Every bar holds the same number of contracts
Reading trend structure without chop	Range or Renko	Bars form only on price movement
Order flow and footprint reading	Time, tick, volume or range	Footprint can sit on any of these; pick by pace
Backtesting entries and stops	Time, or trade-driven bars from real trades	Avoid prices that never traded

Many traders use two charts: a time chart for context and levels, and an activity or price chart for timing. That pairing gives the shared reference of the clock and the adaptiveness of the other.

Setting the Size

For tick, volume, range and Renko charts, the size setting matters as much as the type. Some practical guides:

• Start from the bars per session you want. If you want around 100 bars in your trading window, divide the window's typical volume (or trade count, or price travel) by 100.
• Set sizes per product. A volume size that suits ES will be wrong for a thinner market. A range size that suits ES will be wrong for NQ.
• Revisit sizes when markets change. If volume shifts a lot over months, the same volume size will form bars at a different pace.

Common Mistakes

Using one size across products. A 16-tick range on ES and on NQ builds very different charts.

Trusting Renko prices. A brick close is not a fill. Plan prices against a chart that shows real trades.

Keeping time-based indicator lengths on activity bars. A 14-period oscillator on a 500-tick chart measures 7,000 trades, not 70 minutes.

Comparing tick charts across data sources. Different feeds can count trades differently, so the same "500 ticks" may be different bars.

Accepting approximated bars without knowing. If trade-driven bars come from minute data, the boundaries are estimates.

Practical Checklist

• Name the job first: planning, timing, structure or review, then pick the bar type that suits it.
• Use a time chart for context even if you time entries on another type.
• Set sizes per product and convert them to points and dollars: range ticks x tick value tells you what one bar of movement is worth.
• Re-think indicator lengths whenever you change bar type.
• Check your data: trade-driven bars should be built from every trade your connection sends, not reconstructed.
• Know the Renko and volume-bar rules your chart uses (reversal bricks, large prints).
• Review the bar size every few months as market activity changes.

The Bottom Line

A bar type is a lens. Time bars show the market through the clock, tick and volume bars through activity, and range and Renko through price movement. Each lens makes some things clear and blurs others.

The traders who get the most from their charts are not the ones who found the perfect bar type. They are the ones who know what each type is hiding, and choose deliberately for the job in front of them.

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NexTick360 charts every CME futures market on time, tick, volume, range and Renko bars, with trade-driven bars built from your broker's trades where your connection sends them. See the charts