Portfolio Rebalancing Calculator

Rebalancing means adjusting a portfolio back toward a chosen target allocation. Over time, some assets grow faster than others and your mix drifts away from the split you intended. Rebalancing buys or sells to bring each asset back near its target weight, which is usually done to keep the portfolio's risk profile roughly where you wanted it.

First add up your total portfolio value. For each asset, multiply that total by its target allocation to get a target value, then subtract the current value. A positive result suggests buying that amount; a negative result suggests selling it. This calculator does that math for every asset and also shows how far each one has drifted from target.

Both are common. Selling overweight assets and buying underweight ones moves the whole portfolio back to target in one step, but it can trigger taxes and trading costs. Directing new contributions toward underweight assets avoids selling — and often avoids taxes — but rebalances more gradually. This calculator lets you compare both approaches. There is no universally best choice; it depends on your account type, costs, and goals.

There is no single correct schedule. Common approaches are calendar-based (for example once a year), threshold-based (rebalance when an asset drifts more than a set amount from target), and contribution-based (steer new money toward underweight assets). Each has trade-offs between effort, drift, and cost. The right cadence depends on your situation, not a fixed rule.

Not necessarily. Rebalancing is primarily a way to manage risk and keep a portfolio aligned with its intended allocation — it does not guarantee higher returns. In some periods it helps and in others it lags a portfolio left to drift. Its main purpose is discipline and risk control, not outperformance.

No. This is an educational tool that shows the buy and sell amounts needed to reach your target allocation. It does not include taxes, transaction fees, bid-ask spreads, or other real-world costs. Selling assets in a taxable account in particular can create tax consequences, so treat the results as a starting point, not a final plan.

Yes. You can add, rename, or remove any asset class, including Bitcoin, and the calculator will treat it like any other holding. It compares its current value against your target weight the same way. How much of any single asset you hold is your own decision based on your goals and risk tolerance.