Portfolio Allocation Calculator USA: Drift & Scenario Comparison
Compare a current stock, bond, cash and other mix with a transparent educational comparison mix. Explore percentage and dollar drift across scenarios without treating the model mix as a personalized investment recommendation.
See the AllocationFit™ formula, comparison constants and model boundaries
How percentages become dollar drift
- The current mix must total 99.5%–100.5%; a near-total is normalized to exactly 100%.
asset dollars = portfolio value × asset percentage / 100percentage drift = current percentage − target percentagedollar drift = current dollars − target dollarscomparison drift dollars = sum of absolute dollar drift / 2, so an overweight and the matching underweight are not counted twice.- Displayed dollars round to the nearest dollar; internal asset and drift math retains cents or additional percentage precision where required.
Internal comparison mix and score constants
Model version: NH-PA-US-2026.08b. Source review: August 9, 2026.
Base risk mixes, Stocks/Bonds/Cash/Other: Conservative 35/45/15/5; Moderate 60/30/5/5; Growth 75/17/3/5; Aggressive 85/10/2/3.
Horizon controls: 0–2 years caps stocks at 25% and tests for at least 65% bonds plus cash; 3–5 years uses 50% and 45%; 6–10 years uses 75% and 20%; 10+ years uses 90% and 8%.
Goal adjustments: Home/large purchase subtracts 20 points from stocks and adds 10 each to bonds and cash; income stability subtracts 15 from stocks, adds 12 to bonds and 3 to cash; wealth growth adds 10 to stocks, subtracts 7 from bonds and 3 from cash. Retirement and general investing add no adjustment.
Alignment score: starts at 100. Total absolute drift is multiplied by 1.2. Largest-drift penalties are 8 points at the selected threshold, 15 at 10 points and 25 at 15 points. Horizon/equity penalties are 25 for short-horizon stocks above 40%, 18 for medium-horizon stocks above 65%, and 15 for Conservative stocks above 60%. Long-horizon excess cash is multiplied by 1.1 and capped at 20; the stability gap is multiplied by 1.2 and capped at 22. Concentration penalties are 8/15/25 at 10%/15%/25%; an Other bucket of 15%/20% adds 7/12; a user-defined target subtracts 4. The final score is rounded and clamped to 0–100.
Score bands: 85–100 strong alignment; 70–84 mostly aligned; 55–69 review recommended; 35–54 high mismatch; 0–34 correct the mix first. These constants are a NumeraHub educational heuristic, not an official standard or suitability score.
Included and deliberately excluded
Included: four asset-class percentages and dollars, internal or user-defined comparison mix, drift, comparison drift dollars, editable drift threshold, cash drag, stability gap, single-position and sector concentration checks, six comparison paths and two explanatory charts.
Not included: security selection, expected return, future performance, fund fees, capital-gains tax, transaction costs, bid-ask spreads, account type, tax-loss harvesting, liquidity inside the Other bucket, or a regulated suitability assessment.
Practical limit: a mathematically cleaner mix can still be the wrong action when taxes, fees, liquidity needs or the target itself have not been reviewed.
What the official references support
- Investor.gov: Asset Allocation and Diversification — definitions, time horizon, risk tolerance, diversification and preset-percentage rebalancing.
- Investor.gov: Rebalancing — the definition of returning holdings to an intended allocation.
- FINRA: Asset Allocation and Diversification — goal-specific mixes, rebalancing methods, costs and taxable-account cautions.
- FINRA: Concentration Risk — look-through overlap, diversification across and within asset classes, and periodic review.
These references support the educational boundaries and definitions. They do not prescribe NumeraHub’s comparison percentages, 5-point default threshold, alignment score or stress cases.
Enter the allocation and the purpose of the money
Portfolio size
Start with the current portfolio value. The calculator converts each allocation percentage into dollars.
Current allocation
Enter the asset-class mix as percentages. A total close to 100% can be normalized; a larger mismatch must be corrected.
Planning profile
The target allocation is based on the selected horizon, risk comfort and goal. It is a planning heuristic, not a recommendation.
Market movement can create allocation drift without a new trade.
A high stock mix can be reasonable long term but dangerous for near-term goals.
Several funds do not always mean true diversification if the holdings overlap.
Advanced review options Optional checks for concentration, stock split and user-defined targets. +
Concentration checks
Asset-class allocation can look balanced while one position or sector still carries too much risk.
Stock mix detail
This does not change the main stock allocation. It helps explain whether stock exposure is mostly U.S., international or unclear.
User-defined target
Use this only when you already have a target allocation. The engine will check drift and risk signals, not confirm suitability.
Your current mix versus an educational comparison mix
Calculate to compare the entered mix with a model scenario
The calculator will show how the entered allocation differs from a transparent model comparison mix. The comparison is educational: it does not tell the user what to buy, sell, hold or rebalance.
After a valid Calculate, the page can show percentage drift, dollar drift, model alignment and scenario stress tests.
A larger drift means the entered mix differs more from the selected comparison assumptions. It does not mean a trade is required.
Taxes, fees, account type, specific holdings, liquidity needs and suitability are outside this model and can materially change a real-world decision.
Use the result to compare scenarios and understand model sensitivity. Treat the comparison mix as a reference assumption, not as a portfolio prescription.
Nothing is calculated yet. Results, table, scenarios, charts, sticky summary and XLSX export stay hidden until a valid Calculate.
Scenario comparison pending.
Run a valid calculation to compare the entered allocation with the selected educational comparison mix.
Current stock allocation
Comparison stock allocation
Largest drift
Comparison drift dollars
What this scenario difference means
The result will explain the largest difference versus the selected comparison mix.
Context to verify
The model comparison does not establish suitability or prescribe a portfolio change.
Largest model difference appears here.
This block explains which assumption creates the largest difference in the comparison.
AllocationLens™ Scenario Drift Map
See how the current portfolio compares with the model mix, where the largest mismatch appears, and how many dollars differ.
Calculate to see whether the largest gap is an overweight, underweight, cash drag, stability gap or concentration issue.
The note will explain what assumption creates the largest difference in the selected scenario comparison.
Six allocation paths to compare
Each scenario runs through the same AllocationFit™ engine, so percentage drift, dollar drift, model signals and alignment score are compared consistently. None of the six paths is presented as a personalized recommendation.
Entered allocation
Uses the entered allocation as the baseline scenario.
Calculate to compare this scenario.
Model comparison scenario
The engine will choose this based on material improvement, not higher expected return.
Calculate to compare this scenario.
Alternative scenario 1
Calculate to compare this scenario.
Alternative scenario 2
Calculate to compare this scenario.
Stress Case 1
Stress cases are labeled for comparison only, never as recommendations.
Stress Case 2
Stress cases are labeled for comparison only, never as recommendations.
Where the scenario difference comes from
The ledger stays hidden until a valid Calculate, then reconciles the entered mix against the selected educational comparison mix.
| Component | Amount | Note |
|---|---|---|
| Illustrative profile | ||
| Portfolio value | $100,000 | Example portfolio used only to demonstrate the complete calculation. |
| Planning profile | Moderate / 10+ years | Retirement goal, 5-point editable drift threshold, no concentration inputs. |
| Current mix | 70 / 20 / 5 / 5 | Stocks / Bonds / Cash / Other; entered total equals 100%. |
| Internal target | 60 / 30 / 5 / 5 | Moderate base mix from the disclosed NumeraHub planning heuristic. |
| Drift and review amount | ||
| Stock drift | +10 points | $70,000 current minus $60,000 target = +$10,000. |
| Bond drift | −10 points | $20,000 current minus $30,000 target = −$10,000. |
| Cash and Other drift | 0 points | Both buckets already match the internal target. |
| Comparison drift dollars | (|+$10,000| + |−$10,000|) / 2; this is not a trade instruction. | |
| Alignment score | 61/100 | Internal heuristic after total-drift and largest-drift penalties. |
| Example verdict | Meaningful mismatch | Educational comparison only; taxes, costs, account type and suitability are not modeled. |
See the current mix, comparison mix and dominant model signal
Two charts only: one shows current versus comparison allocation, and the second shows the strongest model or drift signal selected by the result.
Current vs comparison allocation
Shows how far each asset class sits from the selected educational comparison mix.
Risk / drift impact
The chart will adapt to the strongest risk in the result.
AllocationFit™ XLSX report
The workbook uses the latest calculated result only. It includes seven sheets: Summary, Current Allocation, Target Allocation, Drift Comparison, Scenario Comparison, Chart Data, and Assumptions & Methodology.
Read drift before changing the portfolio
Use the portfolio you want to review. Keep emergency savings separate unless that cash is intentionally part of the investment portfolio.
Choose the time horizon, risk comfort and goal that match the money’s purpose. A near-term home fund should not be judged like a 25-year retirement portfolio.
Start with the biggest drift or strongest risk flag. Small allocation differences matter less than a major stock overweight, cash drag or concentration issue.
Why the largest allocation gap matters more than portfolio size
The result is a planning review, not a command to trade. A portfolio can be technically diversified and still poorly aligned with the money’s purpose. A 75% stock allocation may be reasonable for a long-horizon retirement account, but it can be too exposed for money needed in the next two years. A 30% cash position can protect a short-term goal, but the same cash level can drag on a long-term growth plan.
AllocationFit™ focuses on the gap between your current mix and the selected planning profile. Portfolio value sets the dollar scale, while the largest drift identifies the first mismatch to verify.
Understand what drives the scenario difference
Fix the inputs before relying on any verdict. A portfolio mix below or above 100% changes every dollar calculation.
Check the time horizon first. The same stock percentage can be acceptable for long-term wealth building and risky for a near-term spending goal.
Decide whether the cash is intentional. Cash reserved for a near-term goal is different from idle cash sitting inside a long-term investment account.
Review the largest overweight and underweight together. In this model, both sides form one review amount rather than two separate trades.
Why time horizon changes the meaning of risk
Time horizon is the pressure point in allocation planning. Money needed soon has less room to recover from market volatility. Investor.gov notes that a longer horizon may support greater comfort with volatile investments; the internal model therefore permits a higher stock cap, while real loss tolerance and liquidity needs still require a separate review.
Rebalancing is not about predicting the market. It is a discipline for bringing the portfolio back toward the selected asset mix when market movement changes the risk profile. A stock-market run-up can quietly turn a moderate portfolio into a growth-heavy portfolio without any new contributions.
Three situations where allocation drift matters
Long-term profile with $27,600 of cash drift
Current mix 50/17/28/5, Moderate risk, 10+ years and a retirement goal produces the internal 60/30/5/5 comparison mix. Cash is 23 points, or $27,600, above the model reference. The model returns 0/100, indicating a very large mismatch within this educational scenario.
Scenario takeaway: the result shows how strongly the cash assumption changes the model comparison; it does not prescribe where the cash should be held.Near-term home fund with $44,000 of stock drift
Current mix 70/15/10/5, Conservative risk and a home-purchase goal produces a 15/55/25/5 internal target. Stocks are 55 points, or $44,000, above target. The score is 0/100 and time-horizon equity pressure becomes the verdict.
Scenario takeaway: the short-horizon assumptions make stock exposure the dominant model signal; suitability still requires information outside this calculator.A stock run-up creates a $28,000 review amount
Current mix 74/16/5/5 against the Moderate 60/30/5/5 comparison mix puts stocks 14 points, or $28,000, above the model reference and bonds the same amount below. The score is 51/100, which the model labels as a meaningful mismatch.
Scenario takeaway: market gains can change the mix even when no new trade caused the drift.Four mistakes that weaken allocation decisions
Treating a generic rule as personal advice
Rules of thumb can be useful starting points, but they do not know the investor’s cash needs, job stability, tax situation or emotional tolerance for losses.
Use the rule as a comparison point, not the final answer.Ignoring time horizon
Stock exposure means different things when the money is needed in one year versus twenty years. The result should be judged against the goal date.
Match the portfolio risk to when the money may be needed.Letting gains silently change the risk level
A rising market can push stocks far above target. The portfolio may feel successful while becoming more aggressive than intended.
Review drift periodically instead of only after a market decline.Assuming several funds means true diversification
Multiple funds can still hold many of the same companies or sectors. Concentration can hide inside funds, not only individual stocks.
Look through overlapping holdings when one sector or company dominates.How percentages become comparison drift and drift dollars
AllocationFit™ first checks whether the current asset-class percentages reconcile to 100%. Totals from 99.5% through 100.5% can be normalized. A larger mismatch pauses the decision because the current mix is not internally consistent.
The engine then converts each percentage into dollars, builds a planning target from the selected risk comfort, time horizon and goal, and compares current dollars with target dollars. Drift is shown both as a percentage and as a dollar amount. The estimated rebalance amount uses half of the total absolute dollar drift, because moving money out of one overweight asset class and into an underweight class is one review action, not two separate portfolio totals.
The alignment score is a bounded educational heuristic. It considers total drift, largest single drift, short-horizon stock exposure, cash drag, stability gap, concentration inputs and unclear “Other” exposure. It is not a suitability score, risk questionnaire, portfolio optimization model or prediction of future returns.
What AllocationFit measures and where the estimate stops
NH-PA-US-2026.08b; official references reviewed August 9, 2026.
Current and target mix, asset dollars, percentage and dollar drift, review amount, editable threshold, concentration, cash-drag, stability-gap, scenario, chart and export outputs.
Expected return, security selection, fund fees, capital-gains tax, transaction costs, account type, tax-loss harvesting, liquidity analysis, Monte Carlo simulation and regulated suitability review.
The four official references support the definitions and warnings, not the internal target percentages or score: Investor.gov asset allocation, Investor.gov rebalancing, FINRA diversification and FINRA concentration risk.
Educational planning estimate — not investment, tax, legal or financial advice. Review the calculation methodology or report a model issue. The target and score are internal comparison tools, not official or personalized recommendations.
Portfolio allocation questions
Seven formula, target, rebalancing and limitation checks to read before relying on the estimate.
Asset allocation is how an investment portfolio is divided among asset classes such as stocks, bonds, cash and other investments. The mix affects expected risk, volatility and the role each part plays in the plan.
The default target is the disclosed NH-PA-US-2026.08b internal heuristic based on time horizon, risk comfort and goal. No official source prescribes these percentages; they are used only as educational comparison assumptions. Advanced users can enter a custom target for drift checking, but the calculator does not confirm its suitability.
No. The result is an educational planning estimate. It does not recommend securities, confirm suitability, provide fiduciary advice or predict future investment performance.
Portfolio drift means the current allocation has moved away from the target allocation. Market gains, losses, withdrawals and contributions can all change the portfolio mix over time.
Investor.gov describes preset-percentage monitoring as one rebalancing approach but does not prescribe a 5-point rule. This calculator uses 5 points only as an editable internal default. Review taxes, transaction costs, account type and the target itself before acting.
No. Diversification can spread risk across asset classes, sectors or holdings, but it cannot remove market risk, inflation risk, concentration risk or the risk of needing money at a bad time.
No. The calculator does not include capital gains tax, fund expense ratios, bid-ask spreads, transaction costs, tax-loss harvesting or security selection. Those can change the real decision.