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What Is an OHLC Candle, and Why Timeframe Changes Everything

July 11, 2026 · AlphaFlowSeven

TL;DR

An OHLC candle summarizes price over an interval as Open, High, Low, Close. The interval you pick isn't cosmetic: a 15-minute and a daily council read genuinely different markets, because every indicator is computed from the candles you chose.

Every chart and indicator rests on OHLC candles, and most people pick a timeframe without realizing they’re choosing which market they see. It’s one of the most consequential decisions in any strategy.

What an OHLC candle is

Raw trades are too granular to reason about, so they’re bucketed into intervals. Each bucket becomes one candle with four numbers: the Open (first price), High (peak), Low (trough), and Close (last price) of that interval. A “4-hour candle” compresses four hours of trading into those four values.

Why the timeframe is not cosmetic

Here’s the part people miss: indicators are computed from candles. RSI, ADX, DMI, ATR — all of them read a series of candles. Change the interval and you change the input, so you change every downstream number.

A 15-minute RSI and a daily RSI on the “same” asset are measuring different things. The 15-minute one reacts to intraday noise; the daily one to multi-day swings. A signal that looks strong on one timeframe can be invisible or opposite on another. There’s no “true” timeframe — there’s only the one that matches your intent.

Matching timeframe to strategy

Neither is better; they answer different questions. The error is mixing them carelessly — reading a daily trend but acting on 1-minute wiggles.

Candle close matters too

A candle isn’t final until its interval ends. Acting on an unclosed candle means acting on a price that can still change — a subtle source of look-ahead bias if a backtest “decides” on a candle using its not-yet-known close.

In a council

AlphaFlowSeven computes indicators on the same interval a council is configured for, so a 4-hour council reasons over 4-hour candles end to end — no mismatch between what it analyzes and what it acts on. Choosing that interval is one of the most important configuration decisions you make.

See how interval shapes a live council’s read — run one free, no card.

FAQ

What does OHLC mean?

Open, High, Low, Close — the four prices that summarize trading over a fixed time interval. A '1-hour OHLC candle' is the opening price, the highest and lowest prices, and the closing price for that hour.

Tags: market-data

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