Calculators
Use calculators after you understand the basics.
If you’re new, start with the 7-step Guide first. Calculators are great — but only after the core ideas are clear.
Growth
Compound Interest
See how a starting amount and monthly investing can grow over time. Best first calculator for beginners.
Open →Comparison
Investment Growth
Compare two return scenarios side by side and see how even small differences can matter over the long term.
Open →Planning
Retirement Planning
Estimate how much capital regular investing may build before retirement under different contribution assumptions.
Open →Decumulation
Withdrawal Strategy
Model portfolio withdrawals and test how different spending assumptions may behave over time.
Open →Allocation
ETF Portfolio Simulator
Explore simple allocation ideas and compare how a portfolio may develop over time.
Open →Builder
Portfolio Builder
Build a simple ETF mix step by step based on risk, broad allocation choices, and a monthly investing plan.
Open →More calculators & decision tools
These are useful once the main calculator logic already makes sense.
Fees
TER Impact
See how small annual ETF cost differences may quietly reduce long-term portfolio value.
Open →Broker costs
Commission Cost
Check how broker commissions affect smaller monthly investments and overall efficiency.
Open →Maintenance
Rebalancing Tool
Review portfolio drift and estimate what may need to be rebalanced back to target.
Open →Hub
More calculators & tools
TER impact, commissions, rebalancing, allocation planners — in one place.
Open →Best first click
Start with Compound Interest
If you are completely new, this is usually the easiest calculator to understand first. It shows why time and regular investing matter so much.
Start there →Next step
Need a full beginner draft?
If you want more than separate calculations, the Portfolio Builder helps turn rough ideas into a simple starting structure.
Open →