Footprint chart

What it is

A footprint chart is a bar chart where each bar shows what happened inside it — specifically, the bid volume and ask volume that traded at every price level the bar touched. Instead of one bar reduced to four numbers (open, high, low, close), you get the full per-price breakdown of who was aggressing where.

Each price row inside a bar typically displays two values: volume traded at the bid (seller-initiated) and volume traded at the ask (buyer-initiated). Variants render those numbers as raw integers, as colored cells where intensity encodes magnitude, as side-by-side bar columns, or as imbalance highlights when one side dominates the other above a chosen ratio.

Footprint charts exist because conventional candlesticks throw away the inside-the-bar texture. A 10-minute candle that closes flat could be a quiet 200-contract drift or a 50,000-contract battle. Footprint shows you which.

Why it matters

Footprint is the most information-dense order flow visualisation available. With one bar you can read:

• The bias of aggression (more ask volume = buyers paying up).
• Where in the bar the action happened (top of range, middle, bottom).
• Whether one side stalled — heavy ask volume at the high with no further price progress is absorption.
• Single prints and zero prints — levels touched with one-sided volume.
• Imbalance clusters where ask:bid ratios exceed structural thresholds.

For intraday futures traders, footprint provides the granularity needed to read intent at structural levels — value area edges, prior highs/lows, naked POCs.

How traders use it on Sierra Chart

Sierra Chart's native footprint implementation is Numbers Bars, a built-in chart type that renders per-price bid/ask volume inside each bar. The cell layout, coloring, font, imbalance thresholds, and which numbers to display (volume, delta, trades, etc.) are all configurable from the chart settings.

Most traders use footprint on lower-timeframe charts (often a tick or volume bar type rather than minute bars) at structural levels, and switch back to a higher-timeframe candle view for trend context. Reading footprint full-time on a 1-minute chart is a known way to overload yourself with noise.

Common patterns / pitfalls

• Imbalance highlights work on a ratio (e.g. 3x more ask than bid on a price row). Setting the ratio too low fires constantly; too high never fires. Calibrate per instrument.
• A footprint with single prints at the bar's edge often signals a continuation level the market will revisit.
• Heavy two-sided volume at the bar high or low with no break = potential exhaustion. Heavy one-sided volume with a break = continuation.
• Footprint on illiquid contracts is unreadable — the per-cell counts are too small to be statistically meaningful.
• Don't confuse footprint imbalance with delta. Imbalance is per-price-cell; delta is per-bar.

Related SCS studies

Delta Candle Color complements Numbers Bars by surfacing the bar-level aggression read on the price chart itself. Single Print and Gap auto-detects the one-sided footprint structures that traders typically annotate manually.