A portfolio's weighted return is calculated by multiplying each asset's individual return by its weight (proportion) in the portfolio and summing the results. The formula is: Rp = w1 × R1 + w2 × R2 + ... + wn × Rn, where wi is the weight of asset i and Ri is the return of asset i. This gives a single number that represents the blended performance of all holdings combined.

Understanding weighted returns is fundamental to portfolio management and asset allocation. It reveals the true drivers of portfolio performance. A small allocation to a high-returning asset may contribute less than a large allocation to a moderate-returning asset. For example, a 10% allocation to an asset returning 20% contributes 2.0% to portfolio return, while a 50% allocation to an asset returning 5% contributes 2.5%. This highlights the importance of both allocation size and individual asset performance.

Investors use weighted return analysis to evaluate how well their asset allocation is working and to identify opportunities for improvement. By examining each asset's contribution, you can determine whether to increase exposure to high-performing assets or reduce allocations to underperformers. This analysis forms the basis of strategic and tactical asset allocation decisions used by individual investors and professional portfolio managers alike.