Spare Change Millionaire Calculator — What Are Your Round-Ups Worth? | TopMoneyApps
🪙 Start investing your spare change today — new members get a $20 bonus
Get $20 with Acorns →
Free Calculator

What Is Your Spare Change
Actually Worth?

Drag the sliders to match your monthly spending. We'll show you how much those invisible round-ups could compound into — the number will surprise you.

↓
Step 1 — Your Monthly Spending
☕
Coffee & Dining Out
$320
~24 transactions/mo → round-ups average $0.50 each
🛒
Groceries
$400
~6 transactions/mo → round-ups average $0.50 each
🎮
Entertainment & Streaming
$120
~9 transactions/mo → round-ups average $0.50 each
🛍️
Shopping & Other
$220
~7 transactions/mo → round-ups average $0.50 each
Your estimated monthly round-ups
Based on avg transaction sizes per category
$23
per month → invested automatically
Step 2 — Your Assumptions

If you invested your round-ups starting today, in 30 years you'd have:

$0
from money you were already spending anyway
After 5 years
—
After 10 years
—
After 30 years
—
Monthly Round-Up Breakdown
Loading insight…
This is Literally What Acorns Does

Start Building Wealth From Your Spare Change — Automatically

Round up every purchase
Invest in diversified ETFs
Takes 5 minutes to set up

Acorns rounds up your everyday transactions and invests the difference into a diversified portfolio. The calculator above isn't hypothetical — it's exactly what Acorns users are building right now.

Get $20 Free When You Sign Up →
Paid partnership. New accounts only. $20 bonus requires qualifying deposit. Terms apply. Investing involves risk.

How Does Round-Up Investing Work?

1

Link Your Card

Connect a debit or credit card. Every purchase you make gets monitored for round-ups.

2

Spare Change Gets Swept

A $4.30 coffee becomes a $5.00 charge — the $0.70 difference flows into your investment account.

3

Compound Over Time

Those tiny amounts get invested in a diversified ETF portfolio and compound year after year.

This calculator is for educational purposes only. Results assume consistent monthly round-up contributions and a fixed annual return with monthly compounding. Actual investment returns vary and are not guaranteed. Past market performance does not predict future results.