Asset Allocation Calculator

How to Use

Enter your total portfolio value, your target percentage for stocks, bonds, and cash (should sum to 100%), and what you currently hold in each. The calculator shows the target rupee value for each class and the rebalance amount, positive means buy more, negative means you're over target, updating live as you type. Watch the Target % Total figure as you adjust percentages, it should read exactly 100% before the rebalance numbers below can be trusted.

What Asset Allocation Actually Controls

Asset allocation, the split between stocks, bonds, and cash (or other broad categories), is widely considered the single biggest driver of a portfolio's overall risk and return characteristics, more influential than which specific stocks or funds are chosen within each category. Stocks generally offer higher long-term growth potential paired with higher short-term volatility, bonds offer more stability and income with lower growth potential, and cash offers safety and liquidity with minimal growth at all. Choosing the target percentages for each isn't a technical detail, it's the primary decision that determines how a portfolio will actually behave through market ups and downs.

Worked Example: Reading a Rebalance Table

Using this tool's own defaults, a total portfolio value of 1,000,000, with target allocations of 60% stocks, 30% bonds, and 10% cash, against current holdings of 500,000 in stocks, 300,000 in bonds, and 50,000 in cash. Target values come from applying each percentage to the total: stocks target 1,000,000 × 60% = 600,000, bonds target 1,000,000 × 30% = 300,000, cash target 1,000,000 × 10% = 100,000. Comparing target against current holdings gives the rebalance figures: stocks need +100,000 (600,000 − 500,000, currently under target), bonds need 0 (300,000 − 300,000, exactly on target), and cash needs +50,000 (100,000 − 50,000, currently under target). Notice current holdings only total 850,000 against a 1,000,000 target, this scenario models 150,000 in uninvested new money still needing to be allocated according to the target percentages.

Why Rebalancing Matters Even Without Adding New Money

A portfolio's actual allocation drifts on its own over time purely from different asset classes growing at different rates, even if you never add or withdraw a single unit of currency. A strong multi-year stock market run can push a portfolio that started at 60% stocks up to 70% or more, simply because the stock portion grew faster than bonds and cash, quietly increasing the portfolio's overall risk level well beyond what was originally intended. Rebalancing, selling some of what's grown to be overweight and buying more of what's become underweight, brings the actual allocation back in line with the original target, which is exactly the calculation this tool performs.

Using New Contributions Instead of Selling to Rebalance

Rebalancing by selling overweight assets can trigger transaction costs and, in a taxable account, capital gains tax on the sale. An alternative approach many investors prefer when possible is rebalancing through new contributions instead, directing new money specifically toward whichever asset class currently shows a positive (under target) rebalance figure, rather than touching existing holdings at all. This calculator's output works equally well for either approach, the rebalance figures show exactly how much each class is under or over target regardless of whether you plan to address that gap by selling, buying with new money, or some combination of both.

Frequently Asked Questions

What should my target asset allocation be?

It depends on your risk tolerance, time horizon, and goals, there's no universal answer. Younger investors with a longer time horizon often lean more heavily into stocks, while those closer to needing the money often shift more toward bonds and cash for stability.

What does a positive or negative rebalance amount mean?

A positive rebalance amount means that asset class is under its target and you'd need to buy more to reach it. A negative amount means it's over target and you'd need to sell or redirect new contributions elsewhere to bring it back in line.

Why do the target percentages need to add up to 100%?

Because every currency unit in the portfolio needs to be assigned to exactly one asset class for the target values to add up correctly to the total portfolio value. If your percentages sum to less than 100%, the target values will undershoot the total, and if they sum to more than 100%, they'll overshoot it, the Target % Total figure this calculator shows is specifically there to catch that mistake before you act on the rebalance numbers.

Why might my current holdings not add up to my total portfolio value?

This can happen intentionally, for example if you're planning where to invest new cash that hasn't been allocated yet, entering your existing holdings alongside a larger total portfolio value (including the uninvested new money) shows exactly how that new cash should be distributed across asset classes to reach your targets, without needing to sell anything you already hold.

How often should I rebalance my portfolio?

Common approaches include rebalancing on a fixed schedule (quarterly or annually) or rebalancing whenever an asset class drifts a set number of percentage points away from its target (a 5% band is a common threshold). Rebalancing too frequently can rack up transaction costs and, in taxable accounts, trigger unnecessary capital gains tax, while rebalancing too rarely lets the portfolio drift meaningfully away from its intended risk level, the right frequency depends on your account type, transaction costs, and how much drift you're comfortable tolerating.

Why does a portfolio drift away from its target allocation over time even without new contributions?

Because different asset classes grow at different rates. If stocks perform strongly while bonds stay flat, the stock portion of a portfolio naturally grows to represent a larger share of the total, pushing the actual allocation above its original target percentage, even though no money was added or moved. This drift is exactly why periodic rebalancing exists, left unchecked, a portfolio's actual risk level gradually shifts away from what was originally intended, usually toward more risk after a strong stock market run.