Free tools
Every calculator Tweed has built, in one place. Each one shows its formula and the 2026 IRS and SSA figures behind it. Your numbers never leave your browser.
Savings calculator
CD calculator
What a certificate of deposit pays at maturity, its effective APY, and what breaking it early costs.
Open →Investing calculator
Dividend calculator
What a holding pays you now, what it grows to when you reinvest the after-tax dividend, and your yield on cost.
Open →Retirement calculator
Retirement calculator
The balance you need at your retirement age, the gap against it, and the extra annual saving that closes it.
Open →Retirement calculator
RMD calculator
Your required minimum distribution, the IRS life expectancy factor behind it, and your RMD age by birth year.
Open →Tax calculator
Roth conversion calculator
The federal tax on converting an IRA or 401(k) to a Roth, the Form 8606 pro-rata split, and your break-even rate.
Open →Retirement calculator
Annuity calculator
What a lump sum buys in period-certain monthly income or grows to in accumulation, with the after-tax exclusion ratio.
Open →Retirement calculator
401(k) calculator
Your projected 401(k) balance from paycheck deferrals and employer match, with the 2026 IRS limits and catch-up tiers applied automatically.
Open →Retirement calculator
Coast FIRE calculator
The balance that, left alone, compounds into your full retirement target with no more contributions, plus the arithmetic behind it.
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