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On $84,000 a year, $2,100 a month. That is 30% of $7,000.00 gross pay, and it is the same ceiling the 40× rule gives: 40 × $2,100 = $84,000. Type your own income below and this rent calculator based on income prints the figure, the ratio behind it, and what is left of it after utilities.
Rent you can afford on $84,000.00 a year
$7,000.00 a month gross × 30% of gross income
Utilities are what the rent does not cover — power, water, gas, internet. Take-home is optional: fill it in and the page also shows what share of your actual pay the rent takes. This page does not estimate taxes for you.
Every figure is worked in whole cents. The monthly gross is the annual income divided by 12 and rounded to the cent, the rent is that figure times the ratio, and the utilities are subtracted last.
One gross income, $7,000.00 a month. The bar length is the monthly rent each ratio allows.
$2,100.00 is 30% of gross pay and 37.5% of a $5,600.00 take-home. Each track below is 100% of its own base.
Two rules of thumb get quoted as if they were separate tests: spend no more than 30% of gross income on rent, and earn at least 40 times the monthly rent. They are one rule written twice. Forty times a monthly rent is the annual income it implies; twelve months of rent at 30% of income is the same statement, because 12 divided by 40 is exactly 0.30.
Put a number on it. A rent of $2,100.00 a month is $25,200.00 a year. Forty times the monthly rent is $84,000.00, and 30% of $84,000.00 is $25,200.00 — the same annual rent, reached from the other end. That is why a letting agent asking for 40× and a budgeting page quoting 30% will agree to the cent, and why a listing that fails one test fails the other.
The same identity gives the multipliers for the other two ratios. A 25% ceiling is 12 divided by 0.25, or 48× the monthly rent. A 35% ceiling is 12 divided by 0.35, or about 34.3×. So the ratio and the multiple are never independent choices — pick one and the other follows.
The phrase names a tool, and the tool can be asked three different questions with the same arithmetic. Give it an income and it returns a ceiling. Give it a rent and it returns the income that rent needs. Give it both and it returns the ratio you are actually at. This page does all three, because the second one is what a renter needs the moment a listing appears.
| You give it | It gives back | Worked example |
|---|---|---|
| A gross income | The rent ceiling | $2,100.00 at 30% |
| A monthly rent | The income it needs | $2,400.00 needs $96,000.00 |
| Both | The ratio you are at | $2,400.00 is 34.29% of $84,000.00 |
A second budget splits pay into 50% needs, 30% wants and 20% savings, and rent sits inside the needs half together with utilities, groceries, transport and insurance. On $84,000.00 a year, which is $7,000.00 a month, the needs bucket is $3,500.00. If everything else in that bucket costs 20% of gross, which is $1,400.00, rent and utilities have $2,100.00 between them: the 30% ceiling again, reached from the other end.
That is what the two rules are good for when put side by side. The 50/30/20 split does not contradict the 30% rule; it explains when the 30% rule is generous and when it is already tight. Where the other needs cost less than 20% of gross, rent can take more than 30% and the budget still balances. Where they cost more, because of a car payment, a medical premium or childcare, the same 30% is already over the needs half, and the ceiling has to come down even though the ratio looks correct.
Read the table backwards and it answers the other question: not what rent an income supports, but what income a rent demands. The multiplier is 40, because the ratio is 30%.
| Monthly rent | Working | Gross income needed |
|---|---|---|
| $1,500.00 | 1,500 × 40 | $60,000.00 |
| $2,100.00 | 2,100 × 40 | $84,000.00 |
| $2,400.00 | 2,400 × 40 | $96,000.00 |
| $3,000.00 | 3,000 × 40 | $120,000.00 |
Three incomes, three ratios, nine ceilings. Every row is the annual figure divided by 12 and then multiplied by the ratio, so any of them can be checked on the calculator above by typing the income and picking the ratio.
| Gross a year | A month | 25% | 30% | 35% |
|---|---|---|---|---|
| $60,000.00 | $5,000.00 | $1,250.00 | $1,500.00 | $1,750.00 |
| $84,000.00 | $7,000.00 | $1,750.00 | $2,100.00 | $2,450.00 |
| $120,000.00 | $10,000.00 | $2,500.00 | $3,000.00 | $3,500.00 |
The ratio is worth $700.00 a month on the $84,000 row and $1,000.00 a month on the $120,000 row. A higher income does not just raise the ceiling — it widens the range that the choice of ratio can move, which is why two people on the same salary can disagree about what they can afford without either of them being wrong about the arithmetic.
A rent of $2,100.00 that excludes power, water, gas and internet is not a $2,100.00 housing cost. Those bills are paid from the same monthly income, so the ceiling has to absorb them. The calculator subtracts them from the rent figure rather than adding them beside it, because the 30% is a cap on the whole housing line.
On $7,000.00 a month gross, $180.00 of utilities leaves $1,920.00 of rent; $250.00 leaves $1,850.00. Paid on top instead, that second case would put $2,350.00 against the income — 33.57% of gross, above the ceiling the same person thought they were keeping to. If a listing includes heat and hot water, the rent line can be higher for the same total; if it excludes them, the rent line has to come down by whatever they cost. The monthly household bill page adds the four utility lines up for a flat, and the split utilities page divides them between roommates.
With roommates the 30% is applied per person and then added, not applied once to a combined income. Three people each earning $52,000.00 have $4,333.33 a month each, so $1,300.00 of rent each and $3,900.00 for the flat. Two of them support $2,600.00, four support $5,200.00.
| People | Each pays | Household ceiling |
|---|---|---|
| 2 | $1,300.00 | $2,600.00 |
| 3 | $1,300.00 | $3,900.00 |
| 4 | $1,300.00 | $5,200.00 |
Adding a fourth person does not change what any one of them can carry, which is the useful part: the household ceiling scales with headcount at a fixed income, so the flat you can rent grows linearly while each share stays put. It breaks when incomes differ. A household of three on $120,000.00, $52,000.00 and $38,000.00 has a combined ceiling of $5,250.00, but an equal three-way split of that ceiling would put one person at 46% of their own income. The split by income page runs the same rent through equal, per-head and income-weighted bases side by side, and the split rent calculator handles the by-room and by-area cases.
The rule is written against gross income, the figure on the offer letter. What leaves a bank account every month is smaller, so the same rent is a larger share of it. At $5,600.00 of take-home, $2,100.00 of rent is 37.5% of the money actually received, not 30%. Neither figure is wrong; they answer different questions, and mixing them is how a budget that looks fine on paper turns tight by the middle of the month.
This page does not compute tax. It takes take-home as an input, because the deduction depends on where you live, how you file and what is withheld, and a number invented here would be worse than no number. Enter the figure from a payslip and the share row appears; leave it blank and the page stays on gross.
Thirty percent is a convention, not a rule with an enforcement mechanism. It says nothing about a deposit, a broker fee, renters insurance, parking, a pet rent or a storage unit — all of which arrive at the same time as the first month and none of which are in the monthly rent line. The rent calculator adds those up into a move-in figure, and the prorated rent page handles a first month that starts mid-cycle. Use this page for the monthly ceiling, then cost the rest before deciding the ceiling is affordable.
$2,100.00 a month at 30% of gross income. The arithmetic is $84,000.00 divided by 12, which is $7,000.00, times 30%. At 25% the same income supports $1,750.00 and at 35% it supports $2,450.00. All three are on the calculator above: type 84000 and switch the ratio.
Gross. The convention is written against income before tax and deductions, which is why the figure feels generous to anyone looking at their bank statement. On $84,000.00 a year the rent is 30% of $7,000.00 gross; against $5,600.00 of take-home the same $2,100.00 is 37.5%. If you want to budget from take-home, apply the ratio to that number instead and accept a lower ceiling.
Earn 40 times the monthly rent in a year. It is the 30% rule stated on the annual figure instead of the monthly one, because 12 divided by 40 is exactly 0.30. A $2,100.00 rent needs $84,000.00 of gross income under either wording, so the two tests never disagree — they are one test.
Take the ceiling first, then subtract what the utilities cost. On $7,000.00 a month gross the 30% ceiling is $2,100.00; with $180.00 of power, water, gas and internet the rent line is $1,920.00. Paying $2,100.00 plus $180.00 puts $2,280.00 against the income, which is 32.57% of gross — past the ceiling, even though the rent alone looked correct.
Apply the ratio to each person's income and add the results. Three people on $52,000.00 each carry $1,300.00 each, so the flat can be $3,900.00 a month at 30%. The ceiling scales with headcount while each share stays the same, as long as everyone earns the same. When incomes differ, split the rent by income rather than by headcount, or the person earning least ends up above the ratio the group agreed to.
Pick the ratio deliberately rather than by default. 25% leaves more room for everything else and is the safer ceiling in a city where utilities and commuting are expensive; 35% is what some households accept to stay in a particular area. The arithmetic does not decide this — the calculator prints whichever ratio you choose, and the choice is the part that needs a real budget behind it.
Then the page tells you by how much, which is more useful than the label. On $84,000.00 a year, a $2,400.00 rent is 34.29% of gross and needs $96,000.00 to sit at 30%. The same rent divided between two people is 17.14% each — which is why a flat share can hold a rent that neither tenant could carry alone.
Those are recurring monthly charges that sit outside the rent line on most leases, so they behave like utilities for this purpose: subtract them from the ceiling if you will be paying them. A $150.00 parking space on a $2,100.00 ceiling leaves $1,950.00 for rent, exactly as a utility bill would. One-off costs at move-in are a different calculation — the rent calculator covers those.
A tool that turns one of three inputs into the other two: an income into the rent it supports, a rent into the income it requires, or a pair of them into the ratio between. On $84,000.00 a year the 30% ceiling is $2,100.00; a $2,400.00 rent needs $96,000.00; and that same rent on that same income is 34.29%. All three answers come from one division and one multiplication, which is why every calculator that carries this name agrees with this page to the cent.