Monthly Income Calculator

Biweekly means a paycheck every 14 days, which works out to 52 / 2 = 26 paychecks in a calendar year. Semimonthly means twice a month on fixed dates (typically the 15th and last day), which is always 12 x 2 = 24 paychecks per year. Two extra paychecks per year is why a $2,000 biweekly check produces $52,000 a year while a $2,000 semimonthly check produces only $48,000. The two schedules are often confused because both land roughly twice a month, but the calendar math is different. Most US private-sector employers run biweekly (BLS reports about 43% of US workers are paid biweekly versus 19% semimonthly), and HR teams often plan for the two extra-check months as bonus cash-flow months for the employee.

Twelve months of exactly four weeks would be 48 weeks per year, and the year is actually 52.143 weeks. The fraction 52 / 12 = 4.3333 captures the extra month-of-spillover that every calendar year contains. So when you convert weekly pay to monthly, you multiply by about 4.33, not 4. Multiplying a $1,000 weekly paycheck by 4 understates monthly income by $333 (and annual income by $4,000), which is the difference between a 48-week year and a real 52-week year. This is also why you cannot simply add four weekly checks together to get a month's pay.

The Social Security tax (the 6.2% half of FICA) only applies up to an annually adjusted wage base. The 2026 wage base is $184,500. Earnings above the cap still owe the 1.45% Medicare portion (no cap), but pay zero additional Social Security for the rest of the year. This is why high earners see a noticeable take-home bump mid-year once they cross the cap. For someone earning $250,000 in 2026, FICA is $184,500 x 6.2% + $250,000 x 1.45% = $11,439 + $3,625 = $15,064, not the flat 7.65% you would get without the cap ($19,125). Self-employed taxpayers pay both halves of FICA on the same wage-base rules.

Gross income is the full amount you earn before any taxes or deductions: it is the number on your offer letter and the figure used for mortgage qualification (lenders typically check gross income against the 28/36 rule). Net income, also called take-home pay, is what actually hits your bank account after federal income tax, state income tax, FICA (Social Security + Medicare), and any pre-tax deductions like 401(k) contributions, health insurance premiums, or HSA contributions. The gap is usually 20 to 35 percent for a typical W-2 worker. Always budget against net income, but reference gross income for credit applications and tax filings. This calculator estimates net by applying flat effective rates; for paycheck-level accuracy with brackets, use the paycheck calculator or take-home pay calculator instead.

The calculator uses 2,080 because 40 hours times 52 weeks equals 2,080. It is a schedule assumption, not a universal BLS or OPM conversion rule; OPM generally uses 2,087 for federal employee hourly rates. Change the hours or paid weeks when the job does not match the default.