Range bars are a type of financial chart used in technical analysis that focus on price movement, ignoring time and volume. Here’s how to calculate range bars:

1. **Define the Range**: Decide on the range size, which is the amount of price movement each bar represents. For example, if you choose a range of $1, each bar will cover a price movement of $1.

2. **Start with a Price Point**: Begin with an initial price point, typically the closing price of the previous bar or the last known price.

3. **Monitor Price Movement**: Track the price movement from the starting point. Note the highest and lowest prices that occur as the market trades.

4. **Determine Completion**: A new range bar is completed when the price moves by the defined range amount in either direction from the starting point. For instance, if your range is $1 and the starting price is $100, a new bar is completed when the price reaches either $101 or $99.

5. **Form the Bar**: Once the price moves the defined range, form the new bar. The open price of the new bar is the closing price of the previous bar. The high and low of the new bar are the highest and lowest prices reached during the range movement. The close price is the price at which the range is completed.

6. **Repeat the Process**: Start tracking the price movement again from the closing price of the newly formed bar. Continue this process to generate subsequent range bars.

### Example:
- **Range Size**: $1
- **Starting Price**: $100
- **Price Movement**: If the price moves from $100 to $101, a new bar is formed.
  - **Open**: $100
  - **High**: $101
  - **Low**: Any lowest price reached during this movement, say $99.50
  - **Close**: $101

Repeat this process with the new starting price of $101. If the price moves to $102, the next bar will form, and so on.

Range bars help traders focus on price movements without being influenced by the time it takes for these movements to occur, providing a clearer picture of price action and trends.