Inside Bars vs Outside Bars: Price Action Explained
An inside bar is a candle whose high and low lie within the preceding candle’s range under a specified convention; an outside bar has a high above and low below the preceding candle’s extremes. They describe relative price ranges, not independently proven buy or sell signals. Their interpretation changes with volatility, timeframe and whether a bar has completed.
How to define an inside bar
Under a strict rule, an inside bar has a high lower than the preceding bar’s high and a low higher than its low. Some platforms permit equality at one extreme, so specify the rule. For example, a preceding fictional daily candle with high £105 and low £95 contains a subsequent candle with high £103 and low £97. The second is strictly inside; it has a narrower range but could still have moved substantially within that range.
How to define an outside bar
An outside bar’s high exceeds the preceding high and its low falls below the preceding low under a strict definition. If the earlier range is £95–£105 and the next bar trades between £93 and £107, the second is outside. This describes a larger observed span, not the order in which the new high and low were reached. Without lower-timeframe data, the chart does not establish whether buying or selling dominated at a specific stage.
Worked example: OHLC and range
Suppose Bar A opens £100, reaches £106, falls to £94 and closes £102. Its range is £12. Bar B opens £102, reaches £104, falls to £97 and closes £98. Its £7 range is fully inside A’s £94–£106 span. Although B is an inside bar, it has a bearish real body because its close is below its open. The inside-bar definition and the bullish/bearish body designation describe different aspects of price movement.
Inside bars and consolidation
A sequence of narrower ranges can be consistent with a temporary contraction in observed trading range. That does not establish reduced uncertainty or prove a breakout is approaching. A market can keep forming inside bars or shift direction without producing a tradeable move. The resulting appearance depends on the previous candle’s size: a very large event-driven candle makes later bars more likely to fit inside its extremes.
Outside bars and volatility
An outside bar can indicate that the current period traded through both sides of the previous range. Around economic releases or earnings, it may reflect rapid two-way price discovery. It does not necessarily mean momentum has reversed. A bullish outside bar that closes near its high can still be followed by a decline, particularly if a larger market trend or fundamental event dominates.
Why pattern naming can be misleading
Some commentators call outside bars ‘engulfing’ even when a strict candlestick-body engulfing pattern is defined differently. One convention compares total high–low ranges, while another focuses on real bodies. Use unambiguous numerical rules when writing or testing strategies. Do not assume that patterns with similar visual names have the same definition across platforms.
Breakout timing and incomplete candles
An inside pattern cannot be confirmed until the candle is complete. A candle that is inside at midday might exceed the previous high before the session ends. A backtest that enters using a completed daily candle’s properties at the same day’s opening uses future information. The first eligible trade after confirmation may face a gap or a spread wider than assumed in the chart-based model.
How to test patterns fairly
Specify strict versus non-strict inequalities, timeframe, data feed, price source, entry rule, exit, risk and costs. Include all inside and outside bars over a meaningful period, not a handpicked collection of successful breakouts. Compare the approach with simpler volatility and trend benchmarks. No chart-shape name removes the need for statistically sound evidence.
For additional risk and market-structure context, refer to candlestick and price-action terminology.
Inside and outside bars: compare the actual highs and lows
Inside and outside bars are defined by the relationship between successive price extremes. Open and close can be useful for interpretation but do not determine these particular strict high–low classifications.
| Bar | High | Low | Classification |
|---|---|---|---|
| Reference bar | 105 | 95 | The comparison range |
| Example A | 103 | 98 | Strict inside bar: 103 < 105 and 98 > 95 |
| Example B | 108 | 92 | Strict outside bar: 108 > 105 and 92 < 95 |
| Example C | 105 | 97 | Equal high: not strict inside under this definition |
Trading platforms and educators sometimes use non-strict definitions that allow equality at one extreme, so a consistent study must state the convention before counting patterns. An outside bar does not reveal whether the high or low occurred first: a completed OHLC record has no intrabar sequence. A short timeframe may also be sensitive to bid/ask rules and session boundaries. The pattern is only a description of price geometry, not a proven forecast of the next candle.
Frequently asked questions
Does an inside bar mean the price must break out?
No. It only describes a narrower range relative to the previous bar.
Does an outside bar show which extreme came first?
No. A completed OHLC bar does not reveal the intraperiod sequence.
Are inside and engulfing bars the same?
Not always. Engulfing definitions may compare bodies rather than full ranges.