📉 RSI Calculator
Paste closing prices to compute the Relative Strength Index and assess market momentum.
Provide at least 15 prices. Last value represents the newest close.
Default RSI period is 14 per Wilder’s smoothing method. Adjust to 7 for faster signals or 21+ for slower trends.
How to Use This Calculator
Collect Closing Prices
Export daily closing prices from your trading platform or data provider in chronological order.
Paste into the Calculator
Enter values separated by commas or spaces. Include at least one more data point than the RSI period.
Select the Period
Choose 14 for the classic RSI. Shorter periods increase sensitivity; longer periods smooth the indicator.
Interpret RSI Values
Use RSI with trendlines, divergences, or moving averages to avoid false signals in trending markets.
Formula
RSI = 100 − (100 ÷ (1 + RS))
RS (Relative Strength) = Average Gain ÷ Average Loss
Average Gain = (Previous Avg Gain × (Period − 1) + Current Gain) ÷ Period (Wilder’s smoothing)
Average Loss = (Previous Avg Loss × (Period − 1) + Current Loss) ÷ Period
Gains are positive price changes; losses are absolute values of negative changes.
The calculator uses Wilder’s smoothing technique, producing values identical to those found in most charting platforms (TradingView, Bloomberg, MetaTrader). Ensure price data is sequential without gaps to maintain accuracy.
Full Description
The Relative Strength Index (RSI) is a momentum oscillator developed by J. Welles Wilder. It oscillates between 0 and 100, indicating the speed and magnitude of recent price changes. Traders use RSI to identify overbought and oversold conditions, confirm trend direction, and spot potential reversals through divergences.
RSI is most effective when combined with price action and trend analysis. For example, in strong uptrends RSI often stays above 40; in downtrends it frequently remains below 60. Adjust the period to align with your trading timeframe—short-term scalpers may prefer a 7-period RSI, while position traders favor 21 or 28.
Advanced Techniques
- Draw RSI trendlines to validate breakouts ahead of price.
- Use RSI divergence (price higher high vs. RSI lower high) to spot weakening trends.
- Combine with moving average filters to trade only in the direction of the prevailing trend.
- Apply RSI to different asset classes—stocks, forex, crypto, commodities—to gauge momentum.
Frequently Asked Questions
What is an overbought RSI reading?
Traditional thresholds mark RSI above 70 as overbought and below 30 as oversold. Adjust to 80/20 for highly volatile assets.
How many prices should I use?
Supply at least period + 1 closing prices. More data creates a smoother RSI and reflects ongoing momentum more accurately.
Does RSI work on intraday data?
Yes. Use the same formulas on hourly, 5-minute, or tick data. Make sure your data set covers enough candles (e.g., 200 bars).
Why does my chart show a different RSI value?
Chart platforms may use different rounding or data (e.g., adjusted close). Ensure your inputs match the data source for consistency.