Evaluate a financial/business math expression. Supports +, -, *, /, **, %, parentheses, and common functions: round(), abs(), max(), min(), sum(), sqrt(). Examples: '125000 * 0.21', '(85000 - 12000) / 12', 'round(1234567.89, -3)'

Calculate gross margin, gross profit, and markup from revenue and COGS.

Estimate 2024 US federal income tax (individuals). Filing statuses: single, married_jointly, married_separately, head_of_household.

Calculate self-employment (SE) tax and deductible half for Schedule SE.

Calculate straight-line or MACRS-style depreciation schedule.

Estimate employer payroll costs and employee net pay for a given gross salary. Covers FICA (SS + Medicare), FUTA, and SUTA estimate.

Generate a loan amortization summary (monthly payment, total interest, full schedule).

Calculate percent change, markup, or margin between two values.

Calculate break-even units and revenue given fixed costs, price per unit, and variable cost per unit.

Format a number as USD currency string (or other locale).