Money Calculation Bug Checker
Find money stored in float or double, BigDecimal(double), toFixed rounding and other currency bugs. Free and private: runs in your browser.
Paste payment, billing or ledger code to find floating-point money handling that causes off-by-a-penny errors.
Numbers are checked locally in your browser and never sent anywhere. Use test data, not real customer details.
Use cases
- Validate test data for payment and banking flows.
- Catch typos in account and card details before calling a provider API.
- Explain money-handling rules to your team with real examples.
Frequently asked questions
Why not use double for money?
Binary floating point cannot store 0.1 exactly, so sums drift (0.1 + 0.2 = 0.30000000000000004). Use decimal, BigDecimal, Decimal or integer minor units.
Is the Money Calculation Bug Checker free?
Yes. It is free with no sign-up, and it runs entirely in your browser, so your input is never uploaded or stored.
Can I use real customer data here?
Avoid it. Everything runs locally, but good practice (and PCI DSS) is to use test data outside production systems.
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