Time Value Area Low (tVAL)

Time Value Area Low (tVAL) is the lowest price level inside the Value Area of a TPO (Market Profile) period, the lower boundary of the price range that contains a chosen percentage of total TPO blocks (time-at-price) for that profile (commonly 70%, configurable).

A TPO profile organizes a session (or another chosen profile window) into time-at-price using letters/blocks that represent fixed time segments; prices with thicker stacks of blocks are where the market spent more time trading during that period. tVAL is simply the bottom edge of that “value” zone, which is computed from TPO block concentration (not from volume-at-price).

• Choose your TPO profile window (session/day/week/month, or another consistent period) and set your block size (time per letter/block) and row size (ticks per row / price binning).
• Build the TPO distribution by counting how many blocks print at each price row across the profile period.
• Identify the TPO POC (the row with the highest block count), then compute the target number of blocks in the Value Area using the Value Area percentage (default is commonly 70% on major platforms).
• Expand outward from POC one price row at a time, adding the side (above vs. below) with the larger adjacent block count until the Value Area target is reached.
• When the target is reached, the lowest included row becomes tVAL (and the highest included row becomes tVAH).

tVAL is commonly used in three connected ways:

• Boundary of value: trading below tVAL places price “outside value” for that profile, which many frameworks treat as a sign the auction is exploring lower prices; whether that becomes bearish context depends on acceptance vs. rejection (does price stay outside value or rotate back in).
• Support/resistance reference: tVAL is often treated as potential support when price is above it, and potential resistance when price is below it and attempts to re-enter value.
• Breakdown vs. rejection read: traders frequently watch whether price trades below value and holds/builds time there (acceptance), or trades below value but quickly returns inside (rejection), using the VAH/VAL/POC framework as a structured map for market context.

• Extended tVAL lines: platforms often let you extend Value Area High/Low levels beyond the profile period (e.g., to end of period/window or until price intersects in the future). These are commonly used as forward reference levels.
• Developing vs. completed value area boundaries: many tools can show developing VAH/VAL as the session builds, and/or plot prior-period VA levels (for example, “reference n periods back”).

Note: Alerts on extended tVAL: some platforms support alerts specifically for price crossing extended VAL, and may restrict alerts to completed profiles to reduce noise.

• Mixing tVAL (time-based) with volume-based VAL: some platforms can color/highlight TPO value areas using volume profile value area rules, which can cause accidental mislabeling if you assume “VAL” always means the same measurement.
• Comparing levels without matching settings: differences in block size, row size/binning, session boundaries, value area %, and tie-handling can produce different tVAL values across charts or platforms.
• Incorrect tick size / incompatible bar construction (platform-specific): some implementations require tick size to be correct and the chart bar period to divide evenly into the TPO block length; otherwise value area lines can be inaccurate or inconsistent.
• Treating tVAL as a guaranteed “signal” instead of a reference: platform documentation frames VAH/VAL as boundaries of where activity concentrated and as potential support/resistance references, not deterministic predictors.