Free US calculators
Financial math you can read.
Fintrivex publishes household calculators that run in your browser. Each one shows the formula beside the result. No accounts. No lead forms.
3 live calculators
Live calculators
Home & mortgage
Saving & investing
Income & taxes
- Paycheck Take-home pay after federal income tax and FICA withholding. Soon
- Social Security COLA calculator See how a cost-of-living increase changes your Social Security check after Medicare Part B.
Debt & loans
- Debt payoff The interest you avoid by paying extra, and the order of the balances. Soon
Guides
- How compound growth works Why a balance grows faster when interest is added to the balance, and how a monthly contribution changes the path.
- 2027 tax brackets and standard deductions Status of the 2027 IRS inflation adjustments, with the verified 2026 brackets shown until the next revenue procedure is published.
Just updated
- Social Security COLA calculator published
2026-10-11 · The Social Security COLA calculator is live ahead of the scheduled October 14, 2026 announcement.
- 2026 federal tax figures added
2026-10-11 · Standard deductions and ordinary-income brackets for 2026 were copied from IRS Revenue Procedure 2025-32.
Built to be checked
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3
Live calculators in the registry
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8
Cited primary sources
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