Investments
Simple Interest calculator
Quick interest math for short-term loans and notes.
Your inputs
$
%
Results
Total amount
$11,500.00
Interest earned
$1,500.00
Principal
$10,000
Breakdown
Total: $11,500
Result composition
0%25%50%75%100%
- Interest earned$1,50013.0%
- Principal$10,00087.0%
Derived from your result figures.
AI Insight
Personalized analysis from your numbers
Tap Generate for an AI-written breakdown of what your numbers mean, plus tailored next steps.
Share link
About this calculator
What the Simple Interest calculator does
Simple Interest Calculator helps you quick interest math for short-term loans and notes. It runs entirely in your browser — your inputs are never sent to a server.
How to use it
- Enter your details: Principal, Annual rate, Time (years).
- Results update instantly as you type — no submit button needed.
- Tap an info icon next to any field for guidance on what to enter.
- Use the Share button to save a permalink that restores your exact inputs.
- Tap Generate on the AI Insight card for a personalized written breakdown.
Tips & context
- Try a few scenarios — adjust one input at a time to see its impact.
- Save useful scenarios to your dashboard for later comparison.
- Pair this with other Investments calculators for a fuller picture.
FAQ
Frequently asked
Is this calculator free?+
Yes — every CortexCalculator tool is free, requires no signup, and runs locally in your browser.
Is my data private?+
Absolutely. Inputs stay on your device. Only anonymous AI Insight requests (when you tap Generate) leave the page.
How accurate are the results?+
We use standard financial formulas and refresh tax rates annually. Treat outputs as planning estimates, not professional advice.