Compare end values saving the same annual total in weekly, monthly, or quarterly contributions.

1,200 a year for 20 years at 6%: weekly contributions end at roughly 46,750, monthly 46,522, quarterly 46,117. The spread is small but real — about 1.3% between weekly and quarterly over 20 years. Frequency matters less than amount; but if scheduled payments are flexible, earlier is marginally better.

What the result means

Primary shows the weekly projection (typically slightly highest because earliest compounding). Secondary rows compare monthly and quarterly, and show the gap between weekly and quarterly.

How much frequency matters

Less than most people think. The headline lesson is 'more frequent is marginally better when possible' — useful if scheduling is flexible — but the amount saved matters far more than the schedule. Doubling contributions has 100× the impact of switching from quarterly to weekly.

Run it with sensible defaults

Using annual savings of 1,200, annual return of 6%, years of 20 years, the calculation works out to 46,356.42. Nudge the inputs toward your own situation and the output recalculates instantly. The defaults are meant as a starting point, not a recommendation.

The levers in this calculation

The inputs — Annual Savings, Annual Return, and Years — do not pull with equal force. Not every input has equal weight. Flip one at a time toward extreme values to feel which ones move the needle most for your situation.

How the math works

Each frequency uses the standard ordinary-annuity FV formula with the periodic rate. Weekly: 52 periods per year; monthly: 12; quarterly: 4. The compound frequency of the underlying return is assumed to match the contribution frequency. The working is transparent — you can verify every step yourself in the formula section below. No black box, no opaque "proprietary model".

Turning the result into a plan

A projection is just a starting point. The real work is setting the monthly amount aside automatically so the saving happens before you can spend it. Most people who hit savings goals set up a standing order on payday; most who miss them rely on willpower at month-end.

What this doesn't capture

The calculation assumes a steady savings rate and a stable interest rate. Real saving journeys include emergencies, windfalls, and rate changes — especially in easy-access products. The figure is a direction of travel, not a guarantee.