Margin Calculator

Calculate profit, margin percent, and markup percent. Also solve for selling price or cost, with optional extra per-sale costs and totals.

Loan Calculator

Estimate loan payments, total interest, payoff date, and the impact of extra payments and origination fees, including an effective APR estimate.

Payment Calculator

Calculate a loan payment, total interest, and payoff time. Compare monthly, biweekly, or weekly payments and see the impact of extra payments.

Sales Tax Calculator

Add sales tax to a price or remove tax from a total. Supports combined rates or a state-county-city-district breakdown with rounding.

Annuity Payout Calculator

Estimate annuity-style payouts, how long money lasts, or the starting amount needed using rate, timing, frequency, and a final balance goal.

Marriage Tax Calculator

Compare federal tax if unmarried (two returns) vs married filing jointly. See your marriage bonus or penalty for 2025 or 2026.

Estate Tax Calculator

Estimate US federal estate tax plus an optional state estimate. See taxable estate, exclusion used, and tax over the exclusion.