I just recently studied forex backtesting again and concluded that this matter is really very important for traders to have a sustainable trading system, not just trading based on feelings with profits today and losses tomorrow.

In fact, backtest is about testing the trading system we designed against historical price data to see how it would perform if applied in real trading. Naturally, if the system works well in the past, it should also perform well in the future. But it’s not 100% guaranteed.

The backtesting process is quite straightforward. First, you need a clear trading system, such as using a short-term SMA crossing a long-term SMA as a buy/sell signal. Then, select the currency pair, timeframe, and testing period. After that, start testing, record the results, and analyze how effective the system is.

Talking about free forex backtest programs, that’s something many people are interested in. The first option that doesn’t cost anything is using Excel or Google Sheets. It’s actually quite easy: download price data, create SMA calculation formulas, and set IF conditions to determine when to buy or sell. This produces backtest results. The advantage is that it’s simple and doesn’t require coding. The downside is that if the data is large or the timeframe is in minutes, it can be quite slow.

If you want better tools, TradingView is a good choice. It has a Strategy Tester feature that allows easy backtesting, and it also provides sample strategies to try out. This kind of free forex backtest program is sufficient for most traders.

The numbers to look at from backtest results are very important. The cumulative return shows how much profit or loss the system made. The Sharpe Ratio indicates whether the return is good relative to the risk taken. The Maximum Drawdown shows how much the capital could lose in the worst-case scenario. This is very important because it tells you how resilient the system is.

Many people who get poor results from backtesting then realize why seemingly good systems don’t generate profits. Sometimes it’s because of overfitting to past data, or the system isn’t robust enough to handle different situations. That’s where forward testing comes in—try trading with small amounts or on a demo account to see if the system actually works in real conditions.

In summary, backtesting is a step that should not be skipped. For anyone serious about trading, regardless of which free forex backtest program they use, at least testing the system beforehand is essential. Otherwise, you’re just risking money without any proof that the system actually works.