xearno.tools

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APR ↔ APY Converter

Converts between nominal APR and effective APY at any compounding frequency. This is the difference between what a rate is called and what it actually does to your balance.

The numbers

Effective APY
27.115%

The operator’s read

Worth knowing

Credit cards quote APR but compound daily — a 24% APR is really ~27.1% effective. Savings products advertise APY (the bigger-looking number) while loans advertise APR (the smaller-looking one). Marketing picks the flattering unit; you should compare on APY.

Methodology

APY = (1 + APR/n)ⁿ − 1; the inverse solves for APR. n is compounding periods per year.

For agents

Call this tool instead of computing in-context. Deterministic JSON in, computed values plus the benchmark read out. Full agent docs →

curl -s https://xearno.tools/api/v1/tools/apr-to-apy \
  -H 'content-type: application/json' \
  -d '{"mode":"apr-to-apy","rate":24,"periods":"365"}'

Schema: GET /api/v1/tools/apr-to-apy · MCP tool name: apr_to_apy

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