Two Asset Portfolio Rebalancing Calculator
Calculate purchases or sales needed to restore a target two-asset allocation after adding cash.
Calculate purchases or sales needed to restore a target two-asset allocation after adding cash. Example result: trade asset a (positive buy, negative sell) = $-4,000.00. Compare your own inputs below. Estimates depend on the stated assumptions and are not a quote or forecast. Defaults are illustrative, not recommendations.
Your result
- Trade asset A (positive buy, negative sell)
- $-4,000.00
- Trade asset B (positive buy, negative sell)
- $14,000.00
- Target asset A balance
- $66,000.00
- Target asset B balance
- $44,000.00
With the example inputs, trade asset a (positive buy, negative sell) is $-4,000.00. A positive trade is a purchase; a negative trade is a sale. New cash can reduce the need to sell an overweight asset, but may not eliminate it.
How to use this two asset portfolio rebalancing calculator
- Current asset A value: enter the amount in your selected currency. The worked example uses $70,000.00.
- Current asset B value: enter the amount in your selected currency. The worked example uses $30,000.00.
- New cash to invest: enter the amount in your selected currency. The worked example uses $10,000.00.
- Target asset A weight: enter a percentage using 5 to mean 5%. The worked example uses 60%.
Start with figures from the same statement date or planning period. Calculate once, save scenario A, then change one assumption to understand its effect. The comparison shows B minus A; a positive difference means the result increased, which is not automatically better.
Formula and calculation method
Total = A + B + new cash; trade A = total × target A − existing A; trade B = total × (1 − target A) − existing B.
The calculator evaluates this relationship directly in your browser. The displayed precision is for readability and does not imply a guaranteed outcome. Time periods and rate conventions matter: use the exact units in each input label and avoid mixing monthly and annual values.
What the result means
A positive trade is a purchase; a negative trade is a sale. New cash can reduce the need to sell an overweight asset, but may not eliminate it.
Two worked examples
1. Illustrative planning scenario
Current asset A value = $70,000.00; Current asset B value = $30,000.00; New cash to invest = $10,000.00; Target asset A weight = 60%.
Apply the stated formula with these inputs. Monetary examples use USD; percentages are divided by 100 inside the calculation. Intermediate calculations retain full precision and displayed amounts are rounded.
| Output | Calculated result |
|---|---|
| Trade asset A (positive buy, negative sell) | $-4,000.00 |
| Trade asset B (positive buy, negative sell) | $14,000.00 |
| Target asset A balance | $66,000.00 |
| Target asset B balance | $44,000.00 |
2. Simplified calculation check
Current asset A value = $700.00; Current asset B value = $300.00; New cash to invest = $0.00; Target asset A weight = 60%.
Apply the stated formula with these inputs. Monetary examples use USD; percentages are divided by 100 inside the calculation. Intermediate calculations retain full precision and displayed amounts are rounded.
| Output | Calculated result |
|---|---|
| Trade asset A (positive buy, negative sell) | $-100.00 |
| Trade asset B (positive buy, negative sell) | $100.00 |
| Target asset A balance | $600.00 |
| Target asset B balance | $400.00 |
The second example uses simpler inputs to make the arithmetic easier to check. It is also included in the automated regression suite. These examples illustrate the model and are not market averages, live offers or personalized advice.
Assumptions and limitations
Exactly two assets with fractional trading and no costs. Excludes capital-gains taxes, bid-ask spreads, minimum trade sizes and allocation recommendations.
Use this output to frame a question or compare consistent scenarios. Reconcile any decision involving an actual product, employment agreement or financial statement with its underlying documents. If a contract uses different rounding or timing, its result may differ from this estimate.
Frequently asked questions
Can I rebalance without selling?
Sometimes. Add new cash and check whether both calculated trades are nonnegative. If either is negative, this exact target still requires a sale.
How do I interpret the trade asset a (positive buy, negative sell) result?
A positive trade is a purchase; a negative trade is a sale. New cash can reduce the need to sell an overweight asset, but may not eliminate it.
What assumptions can change this estimate?
Exactly two assets with fractional trading and no costs. Excludes capital-gains taxes, bid-ask spreads, minimum trade sizes and allocation recommendations.
Can I compare two scenarios without creating an account?
Yes. Save scenario A, change one or more inputs to create scenario B, and compare each result with its difference. Neither scenario requires an account.
Can I use this calculator in another currency?
Yes. Select a display currency and enter every monetary input in that currency. This changes formatting only; it does not convert exchange rates or apply local laws. The static worked examples are in USD.
Sources and verification
The following primary sources provide background on the financial concepts. CalcPane’s formula and assumptions above define this specific model; these organizations do not endorse CalcPane or certify its outputs.
Formula implementation and worked examples checked by automated tests on 2026-10-17. Inspect this calculator’s inputs and expected outputs. Read our calculation methodology. Independent professional review has not been completed for this release.
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Cite this calculator
CalcPane. (2026-10-17). Two Asset Portfolio Rebalancing Calculator. https://calcpane.com/two-asset-portfolio-rebalancing-calculator/
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