Finance Toolkit › Free calculators

50/30/20 Budget Calculator

Split your take-home pay into needs, wants, and savings — with weekly targets you can actually spend against.

The same calculation as an API

Building something? This page calls the same deterministic math the Finance Toolkit API exposes as JSON. Free tier, no signup, no key:

curl -s https://smeltworks.com/financetoolkit/v1/budget/allocate \
  -H 'content-type: application/json' \
  -d '{"monthly_net_income":4200,"rule":"50/30/20"}'

See all endpoints and pricing →

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