Auto-roll return estimator
One-sentence answer: If every rung rolls at the same yield, estimate ending balance after N periods.
Educational calculator. Formulas are plain text. Replace defaults with your documents when accuracy matters.
How it is calculated
Each period: balance ← balance × (1 + y × days/365). Repeat n times. Ignores tax and changing rates.
Worked example
$10,000, 4%, eight 91-day periods — the tool prints ending balance and gain vs start.
Limits
- Not a substitute for official quotes, tax software, or licensed advice.
- Local rules and product terms can differ from this simplified model.
- Static page: inputs are not stored on a server.
Embed:
<iframe src="https://rungrate.com/tools/auto-roll/?embed=1" title="Auto-roll return estimator" loading="lazy" style="width:100%;min-height:420px;border:0"></iframe> <p><a href="https://rungrate.com/tools/auto-roll/">Auto-roll return estimator by RungRate</a></p>
Related
Disclaimer
Educational use only. Not tax, legal, investment, or purchasing advice.
Frequently asked questions
What is this for?
Approximate balance when each maturing rung reinvests at a constant yield. Use the formulas and examples; change one input at a time.
Is this advice?
No. Educational estimates only. Confirm with primary sources and professionals.
How fresh are defaults?
Defaults cite as-of dates on data pages or tool notes.
Can I embed it?
Yes — keep the attribution link on the parent page.
Any AdSense code?
No ad script loader or shared pub-id is embedded here.
Result looks wrong?
Check units and model limits, then contact with URL and inputs.