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Estimate the interest difference from the temporary federal Auto Pay rate reduction through June 30, 2028.

Find elapsed days, inclusive days, weekdays, weekends, and full weeks between two calendar dates.

Compare monthly principal and interest, remaining interest, and a simple cost break-even at two fixed rates.

Model interest-only, fixed, or percentage-based payments, one future draw, payoff time, and interest.

Find the final-exam score needed to reach a target course grade and see when a target is secured or out of range.

Calculate an estimated payment, interest, and payoff schedule for a fixed-rate installment loan with equal monthly payments.

Estimate a monthly mortgage payment, including principal, interest, property tax, and homeowners insurance.

Estimate a dealer-style auto-loan payment with taxes, government and dealer fees, optional products, cash down, trade equity, and negative equity.

Estimate how a starting balance and regular monthly contributions may grow with compound returns.

Estimate how much to save each month to reach a target balance by a chosen date.

Estimate take-home pay from annual salary, an estimated combined deduction rate, and pay frequency.

Calculate adult body mass index from height and weight using the standard U.S. customary-units formula.

Estimate daily maintenance calories from age, sex, height, weight, and activity level.

Find a percentage of any number with a simple, transparent calculation.

Calculate a tip, the bill total, and an even per-person split.

Divide a bill evenly among any number of people.

Find the arithmetic mean of five numbers.

Calculate a sale price, savings amount, and optional after-tax total.