Portfolio Rebalance Calculator
Find the value a holding should have at your target weight and the amount you need to move in or out to rebalance.
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Formula
How the calculation works
Rebalancing compares where a holding sits today with the weight your plan says it should carry, using the total portfolio value as the base.
The calculator turns both percentages into money, giving the current value and the target value for that single holding.
The difference between them is the amount to move, negative when you must trim and positive when you must add.
Common mistakes
- Rebalancing every month, which creates needless trades and taxes for a drift that is usually too small to matter.
- Ignoring the target weight and just selling winners, which quietly lets the portfolio drift away from the risk level you actually chose.
When to use it
- Use it when one holding has drifted several percentage points from its target and you want the exact amount to trim or top up.
- Do not use it to time the market, because rebalancing is about restoring your chosen risk, not about predicting which asset will win next.
Worked example
In a 1250000 portfolio where a holding sits at 72 percent against a 60 percent target, it is worth 900000 but should be 750000, so 150000 must be moved out.
Common questions
Does a negative amount to move mean I should sell?
Yes, a negative figure means the holding is overweight and you should shift that amount into the underweight parts of the portfolio.
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