Finance

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RSI Calculator.

Calculate a relative strength index from a user-entered price series.

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Set your values

Results update as you type.

RSI: 75

RSI

75.00
Relative strength: 3

Relative strength

3.00

FAQs

How does the rsi calculator work?

Enter the requested values to receive a deterministic result. No live market, tax, or jurisdiction data is inferred.

Cite this calculator

Canonical URL: https://mathify.one/zh/finance/rsi

Cite as: Mathify. (2026). 计算器: RSI. https://mathify.one/zh/finance/rsi

Use Cases

Technical Analysis for Trading

Traders use RSI to gauge momentum and identify potential reversal points. By inputting average gains and losses, you can quickly compute RSI for any asset.

Example: If average gain is 2.5 and average loss is 1.5, RSI = 62.5, indicating neutral momentum.

Backtesting Trading Strategies

Analysts can compute RSI for historical periods to test trading rules. This calculator simplifies the process by requiring only average gain and loss.

Example: Calculate RSI for a stock's 14-day period to see if it crossed 70 before a price drop.

Frequently Asked Questions

What is the Relative Strength Index (RSI)?
The RSI is a momentum oscillator that measures the speed and change of price movements. It ranges from 0 to 100 and is used to identify overbought or oversold conditions in a market. This calculator computes RSI using the average gain and average loss over a period.
How is RSI calculated from average gain and average loss?
RSI is calculated using the formula: RSI = 100 - (100 / (1 + RS)), where RS = Average Gain / Average Loss. Simply input your average gain and average loss values, and the calculator will compute the RSI.
What do RSI values above 70 or below 30 indicate?
Traditionally, an RSI above 70 suggests an asset may be overbought, potentially due for a pullback, while an RSI below 30 suggests oversold, possibly due for a bounce. However, these thresholds can vary depending on the asset and market conditions.

Tips & Common Mistakes

Tips

  • Ensure your average gain and average loss are for the same period (e.g., 14 days) to get a meaningful RSI.
  • If average loss is zero, RSI is 100, indicating extremely strong upward momentum.
  • Use RSI in conjunction with other indicators like moving averages for better signal confirmation.
  • Adjust overbought/oversold thresholds (e.g., 80/20) for volatile assets.

Common Mistakes to Avoid

  • Using average gain and loss from different time periods, which skews the RSI.
  • Forgetting that RSI is a lagging indicator and may not predict sudden price changes.
  • Ignoring the context of the market trend; RSI can stay overbought in strong uptrends.

Last updated: August 13, 2026