Calculator Panel
Calculation Ready
Enter your values above and click Calculate.
What This Calculator Does
This calculator calculates exactly which assets to buy and sell to restore target weights, keeping portfolio risk within bounds.
How to Use This Calculator
Input current dollar values and target percentages for Stocks, Bonds, and Cash. Click Calculate to see target values and adjustment buy/sell orders.
How the Calculation Works
The underlying math engine processes your inputs using exact formulas. This systematic approach ensures professional, institutional-grade calculation precision:
Mathematical Formula
Formula Legend:
- · Total Portfolio = Total sum of all asset class values.
- · Target % = Desired weight percentage for each asset.
- · Adjustment = Positive represents Buy order, negative represents Sell order.
Practical Example
Suppose your total portfolio is worth $100,000. Currently, your Stocks are at $70,000 (Target 60%) and Bonds are at $30,000 (Target 40%):
Step-by-Step Mathematical Walkthrough:
- 1 Calculate target value of Stocks: $100,000 * 60% = $60,000.
- 2 Calculate adjustment for Stocks: $60,000 target - $70,000 current = -$10,000 (Sell $10,000 of Stocks).
- 3 Calculate target value of Bonds: $100,000 * 40% = $40,000.
- 4 Calculate adjustment for Bonds: $40,000 target - $30,000 current = +$10,000 (Buy $10,000 of Bonds).
Important Assumptions & Notes
- Total target weights must equal 100%.
- Rebalancing is completed instantly without transaction cost drag.
Common Mistakes or Considerations
- Allowing portfolio allocations to drift over time, which can expose the portfolio to excessive risk.
Frequently Asked Questions
What is portfolio rebalancing?
The process of buying and selling portions of your portfolio to restore your original, desired asset allocation percentages after market movements shift them.
How does the calculator determine rebalancing buy/sell actions?
It compares your current asset weights to your target percentages and calculates the exact dollar amount you need to buy or sell for each asset to align them.
Why is rebalancing necessary over time?
Without rebalancing, higher-performing (and riskier) assets will grow to dominate your portfolio, exposing you to more risk than you originally intended.
Are there tax implications to portfolio rebalancing?
Yes, in taxable accounts, selling appreciated assets to rebalance will trigger capital gains taxes. Rebalancing inside tax-advantaged accounts (like an IRA or 401k) triggers no immediate tax.
How often should I rebalance my investment portfolio?
Most financial advisors recommend rebalancing either on a set schedule (e.g., semi-annually or annually) or whenever an asset class drifts by more than 5% from its target.