OBV and MFI are the two most popular volume indicators built into MT4. Both confirm or warn about trends with volume context, both detect divergence with price, both work cleanly on H1 majors. So which should you actually run?
After a year of running them stacked side-by-side on EURUSD, GBPUSD, and gold across H1 and H4 charts, here’s the head-to-head — what each does well, where each fails, and which trading styles match each tool.
Quick Answer (TL;DR)
OBV wins for: trend-following confirmation, simplicity, swing/position trading.
MFI wins for: ranging/reversal trading, day-trading pullback entries, scalping with short periods.
If you only want one: OBV (lower learning curve, fewer false signals, works in more market conditions).
If you want both: OBV on price chart sub-window for trend confirmation, MFI for thresholded reversal entries at extremes.
OBV vs MFI Side-by-Side
The two indicators stacked on the same EURUSD H1 chart. OBV is the cumulative line on top — no scale, just direction. MFI below — bounded oscillator with 80/20 levels. Notice how OBV gives you continuous trend slope while MFI fires periodic threshold signals.
| Feature | OBV | MFI |
|---|---|---|
| Output type | Cumulative line (no scale) | Bounded oscillator (0-100) |
| Inputs | Volume × close direction | Typical price × volume |
| Primary signal | Slope direction + divergence | OB/OS thresholds (80/20) + divergence |
| Sensitivity | Smooth, slow to flip | Faster, more frequent signals |
| Best market | Trending | Ranging or with clear OB/OS extremes |
| Comparable across pairs | No (cumulative scale meaningless) | Yes (always 0-100) |
| Built into MT4 | Yes | Yes |
In a Trending Market
In a clean uptrend, OBV gives you continuous slope confirmation — the line rises in step with price, telling you the move has volume backing. You can stay in the trade as long as OBV’s slope agrees with price.
MFI in the same uptrend is less useful for staying in. It can reach 80 (overbought) and stay there for many bars while price keeps trending. New traders often misread that as “sell signal” and exit profitable trends early. The 80/20 thresholds in MFI are reversal signals in ranging markets, not trends — but most beginners don’t make that distinction.
Verdict in trending markets: OBV wins. Slope confirmation without false reversal signals.
In a Ranging Market
In a sideways range, MFI shines. The 80 reads at the range high are usable short signals; 20 reads at the range low are usable long signals. The bounded oscillator format gives you natural fade-the-extreme entries.
OBV in a range is less useful — its slope flips repeatedly as price oscillates, producing whipsaw if you trade off slope direction. The divergence signals on OBV still work in ranges, but as primary entry triggers OBV is too sluggish for range trading.
Verdict in ranging markets: MFI wins. The 80/20 thresholds give clean reversal triggers.
For Divergence Detection
This is the closest race. Both indicators produce divergence signals that lead price by 1-3 bars on H1 majors.
OBV divergences are smoother and slightly less frequent. When they fire, win rate in my testing has been around 58% on H1 EURUSD with proper trend filtering.
MFI divergences fire 1.5-2x more often (because of the volume weighting amplifying intra-bar swings). Win rate is comparable (around 55-60%) but with more total signals to act on. The trade-off: MFI gives you more opportunities but more noise.
Verdict for divergence: Roughly tied. OBV for fewer/cleaner signals, MFI for more frequent ones.
For Day Trading
On H1 EURUSD intraday, MFI’s bounded scale and faster reactivity make it the better fit. The 80/20 reads at session highs/lows fire often enough to give intraday entries; OBV’s smoother slope is too slow to be a primary day-trading trigger.
That said, OBV’s slope as a directional filter pairs well with MFI’s threshold signals: only take MFI long signals when OBV slope is up; only shorts when OBV slope is down. The combination outperforms either alone.
Verdict for day trading: MFI as primary trigger, OBV as filter.
For Swing & Position Trading
On H4/D1 swing setups, OBV’s smooth slope and high-quality divergence signals dominate. MFI on D1 fires reversal signals less often (the 80/20 reads on daily charts are rarer) but they’re high-quality when they appear.
For pure position trading (weeks-to-months holding periods), OBV slope is your main read. MFI’s role is opportunistic — fade the extremes when they appear, but don’t expect frequent signals.
Verdict for swing/position: OBV. Smoother slope and cleaner divergences at higher timeframes.
Settings: How to Configure Each
OBV — no parameters except price source (default Close, leave it). The decisions are timeframe (H1 / H4 / D1) and divergence lookback (50 bars on H1, 100 on D1).
MFI — period (default 14, drop to 9 for scalping, raise to 21 for swing). Thresholds default 80/20 — leave them at default unless trading very volatile pairs like XAUUSD where 85/15 might fit better.
The Honest Verdict
If you have to pick one volume indicator for MT4: OBV. Lower learning curve, fewer false signals, works in more market conditions. The slope-and-divergence reading is the foundational volume skill every trader should master first.
If you trade ranges or fade extremes, add MFI. The bounded scale + 80/20 thresholds are exactly what you want for that style.
If you’re a day trader, run both: MFI for entry triggers, OBV slope as the directional filter.
The one configuration I’d avoid: running them on different timeframes (e.g., OBV on H4 and MFI on M15 simultaneously). They can give conflicting signals and the cognitive overhead isn’t worth it. Pick one timeframe per analysis and run both there.
Frequently Asked Questions
Is OBV better than MFI?
Better at different things. OBV is better for trend confirmation; MFI is better for OB/OS reversals. Pick based on your trading style.
Can I use both at the same time?
Yes — and it’s a good combination for day traders. Use MFI as your primary trigger and OBV slope as a directional filter.
Are OBV and MFI free?
Both are built into MT4 at no cost. Our enhanced versions (with divergence detection and alerts) are also free.
Which one works better on forex tick volume?
About the same. Both rely on tick volume which is approximate, so signal quality depends on broker feed quality more than indicator choice.
OBV or MFI for swing trading?
OBV. Smoother slope and higher-quality divergences on H4/D1 timeframes.
Get Both Indicators Free – Enhanced Versions
The free pack includes both:
- FOB_OBV.ex4 — OBV with auto-divergence detection and alerts
- FOB_MFI.ex4 — MFI with auto-divergence and threshold alerts
- Pre-built MT4 template stacking both for direct comparison
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Related Reading
- OBV Indicator MT4 – Full review
- MFI Indicator MT4 – Full review
- best volume indicators for MT4 – The full ranked list
- RSI Indicator MT4 – The pure-momentum cousin of MFI
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