Best guide for this topic: Invest weekly or monthly? (main guide) →
Want more scenarios like this? Explore the weekly hub and monthly hub, then run your own numbers in the calculator.
Consistency matters more than the schedule — but you can model both by converting weekly to monthly.
Compare scenarios in Money GrowthThe difference between investing $500 a week vs $2,167 a month (the monthly equivalent) over 20 years at 7% is negligible — typically less than 1% of the final balance. The reason weekly contributions theoretically win is that money enters the market slightly earlier on average, gaining a few extra days of compounding per contribution. But over a 20-year period, this difference is swamped by the impact of your return rate, the amount you invest, and whether you stay consistent. The frequency debate is the wrong thing to optimise for.
| Factor | Impact on outcome |
|---|---|
| How much you invest | Very high |
| How long you stay invested | Very high |
| Your return rate (fees matter here) | High |
| Whether you stay consistent through downturns | High |
| Weekly vs monthly frequency | Very low |
Most calculators use monthly contributions. To convert:
Monthly ≈ weekly × 52 ÷ 12
| Weekly amount | Monthly equivalent |
|---|---|
| $50/week | ~$217/month |
| $100/week | ~$433/month |
| $200/week | ~$867/month |
| $500/week | ~$2,167/month |
| $1,000/week | ~$4,333/month |
Not always. The habit is usually the main advantage. The maths difference is typically small.
Convert fortnightly to monthly by multiplying by 26 ÷ 12.
Monthly is a common planning timeframe and keeps calculations simple.
Not exactly. This is an average modelling tool, not a precise forecast.
See /how-compound-interest-works.html.
These pages connect to calculators so you can run your own numbers.
Keep exploring — these pages connect directly to calculators so you can run your own numbers.