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How to Backtest Three-Minute Forex Scalping

Research protocol · Reviewed 24 Aug 2026

Three-minute charts create many observations, but the target and stop may sit inside a single source candle. That makes data resolution and execution assumptions more important than a dramatic win-rate comparison.

Document how M3 bars are aggregated and reject outcomes whose intrabar sequence the source data cannot establish.

Resolution before rhetoric

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A three-minute test needs data finer than the decision

M3 scalping is not disproved by one table, but minute-level OHLC may be too coarse to model its fills. Define how three-minute bars are aggregated, then stress spread, commission, slippage, and same-bar sequencing before interpreting performance.

  1. Build M3 candles from a consistent timestamp boundary.
  2. Use lower-resolution data to resolve intrabar order where possible.
  3. Compare net expectancy per trade and per hour.
  4. Avoid generalizing from one pair or session.

The shorter the target, the more the test depends on execution detail.

Build the bars and fill model first

State the source interval, aggregation boundary, timezone, spread, commission, slippage, and same-bar ordering rule. If the data cannot resolve an event, mark it ambiguous or use the conservative outcome.

Compare M3 without handicapping the control

Test M3 and M5 with the same strategy concept, risk, cost source, dates, and maximum exposure. Report trades per hour, net expectancy, drawdown, and cost as a share of gross profit.

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