Monthly Income Calculator

Annual income ＝ amount per period × periods per year　｜　Monthly income ＝ annual income ÷ 12

amountPerPeriod

The figure you are actually paid, on whatever clock you are paid on. It is the only input the whole page runs on, and everything printed is a restatement of it

amountPeriod

Which clock that figure is on, and therefore which divisor builds the annual total: an hour is 2,080 a year, a day is 260, a week is 52 and a month is 12

periodsPerYear

How many of those periods a year holds under the conventions this page uses. It is printed on the panel rather than hidden, because the whole conversion is that one number times the amount

monthlyIncome

The annual total divided by twelve. It is a twelfth of a year, not a thirtieth of a month and not the amount you keep

Use it when the figure you have and the figure you need sit on different clocks: a job advert quoting an hourly wage against a rent that is due monthly, a weekly paycheck against a monthly budget, or an annual salary against the question of what a month of it looks like. It is a restatement of one amount across six clocks and nothing more, so if you already have the monthly figure, the page has nothing to add.

1. Default case: 4,200 a month

   1. Annual income: 4,200 × 12 ＝ 50,400.00
   2. Monthly income: 50,400.00 ÷ 12 ＝ 4,200.00　— the input returned, because a month is this page's base case
   3. Semimonthly: 50,400.00 ÷ 24 ＝ 2,100.00　｜　weekly: 50,400.00 ÷ 52 ＝ 969.23　｜　daily: 50,400.00 ÷ 260 ＝ 193.85
   4. Biweekly: 50,400.00 ÷ 26 ＝ 1,938.46

   The row that looks wrong at first is the last one. Biweekly pay of 1,938.46 is less than twice the semimonthly 2,100.00, even though the two paydays are roughly half a month apart — because 26 pay dates cut the year into smaller pieces than 24 do. That gap is the reason the reference table below exists.

2. 1,250 a week

   1. Annual income: 1,250 × 52 ＝ 65,000.00
   2. Monthly income: 65,000.00 ÷ 12 ＝ 5,416.67
   3. Semimonthly: 65,000.00 ÷ 24 ＝ 2,708.33　｜　biweekly: 65,000.00 ÷ 26 ＝ 2,500.00
   4. Daily: 65,000.00 ÷ 260 ＝ 250.00

   5,416.67 a month on a weekly wage of 1,250 is 4.33 weeks of pay, not four. Anyone who budgets four weeks a month from this wage is planning on 5,000 and will be short every month by more than 400.

3. 30 an hour

   1. Annual income: 30 × 2,080 ＝ 62,400.00
   2. Monthly income: 62,400.00 ÷ 12 ＝ 5,200.00
   3. Weekly: 62,400.00 ÷ 52 ＝ 1,200.00　｜　daily: 62,400.00 ÷ 260 ＝ 240.00
   4. Semimonthly: 62,400.00 ÷ 24 ＝ 2,600.00　｜　biweekly: 62,400.00 ÷ 26 ＝ 2,400.00

   The 2,080 is 40 hours across 52 weeks, which is the convention a full-time hourly wage is annualised with. An hour here is 30 and a day is 240, which is eight of them, so the two rows are consistent by construction rather than by coincidence.

4. A day rate of 150

   1. Annual income: 150 × 260 ＝ 39,000.00
   2. Monthly income: 39,000.00 ÷ 12 ＝ 3,250.00
   3. Weekly: 39,000.00 ÷ 52 ＝ 750.00　｜　biweekly: 39,000.00 ÷ 26 ＝ 1,500.00
   4. Semimonthly: 39,000.00 ÷ 24 ＝ 1,625.00

   A day rate is not a monthly figure divided by 30: at 150 a day the month is 3,250, which is 21.67 working days rather than 30 calendar ones. Day rates are quoted for contractors paid per day worked, and the conversion has to respect that, or it flatters the monthly figure by a third.

This page multiplies and divides; it does not compute a take-home figure. Nothing here subtracts income tax, social insurance, a pension contribution or a student loan repayment, and nothing here adds a bonus, a commission or a shift premium, so every number it prints is gross. It assumes a full-time schedule of five days and 40 hours a week, which is what makes the divisors 260 and 2,080. Anyone working a four-day week, a rotating roster or a seasonal year needs a different daily and hourly figure, and the annual total would have to be built from hours actually worked rather than from a convention. It does not model overtime, so an hourly wage of 30 that is paid at 45 for the last two hours of a day becomes a monthly figure that is too low. It does not handle a part year: starting in April, a stretch of unpaid leave or a gap between jobs all break the assumption that the amount you entered runs for twelve months. The hour and day divisors are the two worth being explicit about. The 2,080 is 40 hours across 52 weeks, and the same source explains why United States federal pay divides by 2,087 instead: a calendar year holds 365 or 366 days rather than 364, so a 52-week year is short by one or two days, and over the 28-year cycle in which the calendar repeats there are on average 2,087 working hours in a year. The two divisors therefore answer different questions — 2,080 is the size of a full work year, 2,087 is what a year of the calendar averages — and a page can only use one of them. The daily row is over 260 working days, not 365 calendar days, which is a different denominator from the one some payroll systems use, so a daily rate printed here can sit a little away from a daily rate on a payslip. The page cannot tell you which pay period your employer uses: 24 and 26 are both real arrangements, and the panel prints both because the choice is not yours. It does not attach a currency, which is deliberate, since the arithmetic is identical in every one and a unit would only invite reading the figures as being about a particular country. Finally, it restates one amount and never compounds it: a raise part-way through the year, or a wage that changes with a contract, is beyond three inputs and one division.

How many weeks are there in a month?

About 4.33, not four. A year is 52 weeks and 12 months, and 52 divided by 12 is 4.333. That is why a weekly wage of 1,250 gives a monthly income of 5,416.67 rather than 5,000: the monthly figure is the annual one divided by twelve, and the annual one is 52 weeks of pay. Budgeting four weeks a month is the most common way this arithmetic goes wrong, and it goes wrong in the same direction every time — the month comes out understated.

What is the difference between semimonthly pay and biweekly pay?

How many times a year you are paid: 24 against 26. Semimonthly pay lands twice a month, usually on the 15th and the last day, and a year gives 24 of those without drifting. Biweekly pay lands every 14 days and drifts against the calendar year, so most years hold 26 pay dates but some hold 27. Both are named separately as payroll periods in the United States tax regulations, and they are not interchangeable at any salary: at 65,000 a year one period is 2,708.33 on the semimonthly schedule and 2,500.00 on the biweekly one.

Why is the daily figure divided by 260 rather than 365?

Because it is a rate for a day worked, not for a day of the calendar. A five-day week across 52 weeks comes to 260 working days, and that is the denominator a day rate is understood against. Dividing by 365 would give a smaller figure that corresponds to no arrangement anybody is paid under, and it would be roughly 30 percent low. The cost of the choice is that this daily figure is not the daily figure a payroll system may use, which is one reason the two can sit slightly apart.

Why 2,080 hours in a year, and when is it 2,087?

2,080 is 40 hours across each of 52 weeks, which is the size of a full work year and the number this page uses. 2,087 is what a calendar year averages once the extra day or two in 365 or 366 days is accounted for, and it is the divisor United States federal pay uses to turn an annual rate into an hourly one. The same source gives both: it states that the older method divided by 2,080, explains that this presumes a year of exactly 364 days, and reports the General Accounting Office finding of an average of 2,087 hours over the 28-year cycle in which the calendar repeats. Ask which question you are answering before picking one.

Is this my take-home pay?

No. Every figure on this page is gross. Income tax, social insurance, pension contributions and anything else withheld are all outside three inputs and one division, and the gap between gross and net is not a fixed percentage of a salary — it moves with where you live, what you are paid and what deductions you have. Use the page to compare one period against another, never to predict what arrives in a bank account.

Which pay period does my employer use, and does it change the answer?

It does not change the annual figure, and it changes every figure underneath it. The page cannot know, because a pay period is a property of a payroll system rather than of a salary: 24 and 26 are both ordinary arrangements, and a biweekly calendar occasionally produces 27 pay dates in a year, which pays out more than the salary over that year. What the panel does is print every period at once for the same annual total, so that whichever one your employer uses, you can read the row that applies rather than converting it yourself.

• Fact Sheet: Computing Hourly Rates of Pay Using the 2,087-Hour Divisor — the 2,080-hour basis of a 52-week year of 40-hour weeks, the 28-year cycle of 4 years with 262 workdays, 17 with 261 and 7 with 260, and the derivation of 2,087.143 from them — U.S. Office of Personnel Management (United States)
• 26 CFR §31.3401(b)-1 — Payroll period: the definition of a payroll period and the closed list of daily, weekly, biweekly, semi-monthly, monthly, quarterly, semiannual and annual periods, with everything else falling into a miscellaneous period — Legal Information Institute, Cornell Law School (United States)
• 29 U.S.C. §207(a) — Maximum hours: the forty-hour workweek that the 2,080-hour year is built from, and the requirement that hours beyond it be paid at one and one-half times the regular rate — Legal Information Institute, Cornell Law School (United States)