Financial Micro-Tools Suite
CashOutline gives you free calculators for three money questions: how two interest rates really compare, roughly what US car, life and health cover might cost, and how long retirement savings could last. Every tool runs in your browser with no login, and the numbers you type are never sent to us. Below each calculator you'll find the formula it uses and a worked example you can check for yourself.
Tools Available Now
APR / APY Interest Converter
Convert nominal interest rates to effective annual yields based on custom compounding frequencies. Compare two financial products side by side.
Launch Tool →Insurance Premium Estimator
Estimate US auto, term life and ACA health premiums, see how each answer moves the price, and compare two scenarios side by side.
Launch Tool →Retirement Runway Calculator
Project 401(k) and Roth balances, estimate Social Security and your first RMD, and see how long your savings could last against your monthly spending.
Launch Tool →How It Works
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1
Choose a tool
Browse the tool library and pick the calculator that matches your question — whether it's comparing interest rates, estimating insurance premiums, or checking how long your retirement savings could last.
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2
Input your numbers
Enter your figures using simple, clearly labeled fields, or load a preset as a starting point. Each page also walks through a worked example step by step.
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3
Get instant results
Your results appear immediately — no waiting, no account creation. Use the side-by-side comparison features to evaluate multiple scenarios at once and find what works best for your situation.
Why CashOutline
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🔒 Your numbers stay in your browser
All calculations run on your device and the figures you enter are not sent to us. If you choose to save a scenario, it is kept in your browser's local storage. Ads on the site come from Google, which uses cookies as explained in our privacy policy.
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⚡ No signup, no barriers
Open any tool and start calculating right away. No account, no email address, no strings attached.
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🌏 Clear about where each tool applies
The APR / APY converter works in any currency and walks through examples from Thailand, Vietnam, the Philippines and Indonesia. The insurance and retirement tools follow US rules, and each says so up front.
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✅ The working is shown
Every calculator is free, and every page shows the formula behind the result, the assumptions it makes and where official figures come from. Read how we check the calculations.
CashOutline is a small, independent collection of personal finance calculators. The APR to APY converter puts two interest rates on the same footing, the insurance premium estimator shows what drives a US quote, and the retirement runway calculator turns a savings balance into a monthly income picture. Each one is free to use with no login, and each explains its own maths so you can judge the result for yourself.