Portfolio & Allocation

Calculators for building and maintaining an investment portfolio — target allocation, rebalancing, and keeping your mix on track as markets drift your holdings away from plan.

Portfolio rebalancing is deceptively simple: multiply your total portfolio value by each asset’s target percentage to get its target dollar value, then subtract what you currently hold. Positive result — buy. Negative result — sell. The math is exact, not an estimate, and this cluster exposes every step of it.

The tools here also surface when to rebalance (the Swedroe 5/25 rule), how to do it tax-efficiently (contribution-first before selling in taxable accounts), and what the standard ordering looks like across account types. No assumptions about returns, inflation, or time horizon are required — these are cross-sectional tools, not projections.

Start with the Portfolio Rebalancing Calculator to enter your current holdings, set target percentages, and get the exact trades needed in either sell/buy or contribution-first mode.