Force Index Indicator: How to Read Volume-Backed Momentum

Price breaks the range you have been watching, you take the trade, and the candle closes green. Then the next bar drifts back inside the range, and the one after that, until the breakout you trusted is just a wick on the chart. The direction was right for a moment. What was missing was anyone else showing up to push it.

That is the gap Dr. Alexander Elder built the force index to expose. It takes the move you can already see and asks a second question underneath it: how much volume actually stood behind that move?

By the end of this guide you will read the force index, choose a setting that fits your job, spot the divergence that warns a trend is tiring, and run the one check that separates a real force index from a repainting imitation.

What does the force index indicator measure?

The force index measures the power behind a price move by multiplying how far price changed on a bar by how much volume traded during it.

Strip it back and there are only two ingredients. The first is the change from the previous close to the current one, which carries the direction and the size of the move. The second is the bar’s volume, which stands in for how many participants were involved. Multiply them and you get a single number that rises when a strong move meets heavy trade and shrinks toward zero when either one is missing.

That combination is the point. A large green candle on thin volume and a small green candle on heavy volume can look similar on price alone, but they mean different things. The force index tells them apart. Most traders smooth the raw value with a moving average so the line is readable rather than jagged, and the length of that average is what turns one tool into two.

Elder introduced the force index in his 1993 book Trading for a Living, where he described it as a way to grade the “force” of bulls or bears on each bar; the reference overview at Investopedia lays out the same price-times-volume construction. It sits in the same family as other participation gauges, which is why it pairs naturally with a cumulative flow tool like on-balance volume .

How do you read the force index?

Pick your smoothing to match your job, then read the line as a pressure balance around zero. Above zero, buyers are pushing; below zero, sellers are. The strongest signal is divergence, not a bare zero cross.

Elder split the tool into two lengths. A 2-period force index reacts almost bar to bar and is used to time entries inside a trend you already trust: in an uptrend, a short dip below zero often marks the shallow pullback where sellers run out of volume, and the return above zero is your cue to look for a long. A 13-period force index smooths the reading into a slower line that answers a bigger question, whether the trend as a whole still has weight behind it.

The read that earns its keep is divergence. Price prints a higher high, but the force index makes a lower peak than it did on the previous high. Price stretched further while the buying pressure behind it shrank, and that mismatch tends to show up before the turn does. The same warning runs in reverse near a low: a fresh low in price paired with a shallower force index trough says the selling is losing its weight. Reading the pressure ahead of the price is the whole reason leading indicators exist, and the force index is one of the cleaner ways to do it because volume is baked into every value.

Two habits keep this honest. First, volume data has to be trustworthy for the tool to mean anything, and in decentralized forex the volume your platform shows is your broker’s tick count, not true market volume, so treat the readings as relative to that feed rather than absolute. Second, do not trade the force index alone. Elder built it as one screen in a stack, confirmed against trend and structure.

Force index vs on-balance volume: what is the real difference?

Put the two volume tools next to each other and they answer different questions. Both use volume, but the force index weights it by the size of the move while on-balance volume ignores that size entirely.

The takeaway is not that one wins. On-balance volume is built to track slow accumulation over many bars, so it shines at spotting quiet buying under a flat price. The force index resets each bar and reacts fast, so it is better at timing the moment a pullback loses steam. A pure price tool like the rate of change is simpler still but throws the volume information away, which is exactly the signal the force index was designed to keep.

Where does the force index mislead you?

Its biggest weakness is the same as its biggest strength: it depends entirely on volume, and volume can lie.

On a news spike, volume balloons for reasons that have nothing to do with a durable trend, and the force index will print a huge bar that fades as fast as it came. On low-liquidity pairs or the first hour of a session, thin volume can flatten the reading even when a genuine move is underway. The tool also says nothing about price structure: a strong force index reading inside a broad range is still a range, not a breakout, so pairing it with a level-based read matters. None of these are reasons to drop the indicator. They are reasons to treat a single force index spike as a question, not an answer, and to confirm it against the market context before acting.

How does RelicusRoad Pro use volume-backed confirmation?

RelicusRoad Pro does not replace a participation read. It handles the part the force index leaves open: fixing a signal at the close so you are not second-guessing a line that still wobbles.

The force index tells you whether a move has weight behind it, and divergence warns when that weight is draining away. What it will not do is call the specific bar to act on, which is why Elder always ran it beside other screens. RelicusRoad Pro locks each signal when the candle closes and holds it there, so a mark you see in a back-test is the same mark you would have traded live. It reads structure and momentum together, and it works the same way whether you run it on MetaTrader 4, MetaTrader 5, or TradingView, so switching charts does not mean relearning the tool.

Be clear about the boundary. A pressure gauge and a signal tool sharpen when you act. Neither one sizes your position or sets your stop, and no honest tool claims to. What the pairing removes is the reflex to hold a move that price still flatters but volume has already abandoned. If you want to verify any of this yourself, the reload check from the non-repaint forex indicator guide is the fastest way.

Frequently asked questions

What is the force index indicator? The force index is a momentum tool built by Dr. Alexander Elder that combines two ingredients into one reading: how far price moved on a bar and how much volume traded while it moved. It multiplies the change from the previous close by the bar’s volume, then usually smooths that with a moving average. A large positive value means price rose on heavy volume, so buyers pushed with real weight behind them. A large negative value means price fell on heavy volume. A value near zero means the move happened on thin trade and may not hold.

What are the best force index settings? Elder suggested two lengths for two jobs. A 2-period force index reacts fast and is used to time entries inside an existing trend, spotting the shallow pullback where the counter-move runs out of volume. A 13-period force index smooths the reading into a slower line that tracks whether the trend as a whole has buying or selling pressure behind it. Neither number is sacred. Match the smoothing to your timeframe and confirm it on the market you actually trade instead of copying a value from a different chart.

What is the difference between the force index and on-balance volume? Both use volume to judge a move, but they weight it differently. On-balance volume adds or subtracts a whole bar’s volume based only on whether the bar closed up or down, so a tiny gain counts the same as a large one. The force index scales volume by the size of the price change, so a big move on heavy volume outweighs a small move on the same volume. On-balance volume tracks cumulative flow as a running line; the force index resets each bar and oscillates around zero, which makes short-term shifts in pressure easier to time.

Can the force index confirm a breakout? It can add weight to one, though no single tool should trigger a trade alone. A breakout backed by a sharp spike in the force index says price cleared the level on heavy participation, which is what you want to see. A breakout where the force index stays flat or shallow says price crossed the line on thin volume, and thin breakouts are the ones that tend to reverse back through the level. Treat the force index as a second opinion on the breakout, not the reason to take it.

Does the force index indicator repaint? The base force index does not repaint. Its value on a closed bar is built from that bar’s finished price change and finished volume, so once the candle closes the reading is fixed and will not move when you reload the chart. The current, unfinished bar does shift with each tick until it closes, which is normal for every indicator and is not repainting. The risk sits in third-party force index arrow or alert add-ons that stamp signals and then redraw them after the fact so a back-test looks clean. Note a past mark, reload, and confirm it stayed put.

The force index will not hand you a top or a bottom, and it was never meant to. It does one job well: it puts volume behind every price move, so a rally running on empty shows up in the pressure before the price rolls over.

See how RelicusRoad Pro turns volume-backed pressure into a signal that holds at the close →