Quick answer: $100 weekly usually comes out ahead because it invests more money across the year and gets money into the market sooner. Over long periods, the difference can become meaningful.
At first glance, $100 a week and $400 a month sound similar. But $100 weekly adds up to roughly $5,200 per year, while $400 monthly adds up to $4,800 per year.
Test different return rates, timeframes and contribution levels. These examples are educational only and exclude tax, fees and inflation.
If you truly invest $100 every week versus $400 each month, the weekly option usually wins because the yearly contribution is higher.
When the total invested per year is the same, weekly investing may still have a slight edge because money enters earlier.
Consistency matters more than trying to optimise perfectly. The best option is often the one you can stick with for years.
Keep exploring — these pages connect directly to calculators so you can run your own numbers.