Trend indicators

Envelopes

Two lines a fixed percentage above and below a moving average, marking where prices are stretched.

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L’idée en termes simples

Prices tend to swing around their average and rarely stray very far from it. Envelopes draw a fence at a fixed distance, say 0.1% for a calm currency pair or 2–3% for a stock, so you can see when a move has gone unusually far.

Mode de calcul

Take a moving average and add or subtract a fixed percentage of it.

Upper = MA × (1 + deviation ÷ 100)
Lower = MA × (1 − deviation ÷ 100)
Defaults: 14-period SMA, deviation 0.1%

Comment l’utiliser

Set the percentage so that most candles stay inside the envelope on your timeframe.
In ranges, touches of the bands can mark turning points.
In trends, closes outside the band in the trend direction show strength.

Tirer des conclusions

Unlike Bollinger Bands, envelopes do not widen in volatile times, so they are easier to read but adapt less.

Exemple

On EURUSD H1 with a 0.15% envelope, the price touches the lower band at 1.0790, about 16 pips below the average, and drifts back to the average over the next few hours.

Les prix des exemples sont donnés à titre d’illustration.

Points de vigilance

The right percentage depends on the market and timeframe: adjust it rather than using the default everywhere.

Un peu d’histoire

Percentage bands around a moving average are one of the oldest band techniques, used long before volatility-based bands such as Bollinger's.

Contenu éducatif uniquement. Aucun indicateur ni aucune figure ne prédit l’avenir, et rien ici ne constitue un conseil en investissement.