50/30/20 Budget Calculator: Split Your Take-Home Pay (Free)

This calculator runs entirely in your browser: nothing you type is uploaded, stored or sent anywhere, and it keeps working with the connection off. Enter one number, your monthly take-home pay, and it splits that number into needs, wants and savings using the 50/30/20 rule. It also shows what those buckets mean per week and per year, lists the lines that usually belong in each one, and lets you move the percentages when the standard split does not match your rent.

How to use it

1. Find your take-home pay. This is the amount that actually arrives in your account each month, after tax and payroll deductions. If you are paid every two weeks, multiply one paycheck by 26 and divide by 12; that gives a true monthly average rather than a two-paycheck month. If your income varies, use a cautious figure, such as your lowest month in the last year, and treat anything above it as a bonus for the savings bucket.
2. Enter it and set the symbol. Type the figure in the first field. The currency symbol field defaults to a dollar sign; change it to whatever you budget in. It only changes how the results are printed, and nothing is converted.
3. Read the three amounts. Needs and wants show a monthly figure and a weekly one underneath, because a weekly number is easier to feel while you are living it. Savings shows the monthly figure and what it adds up to over a year, because a year is the horizon where saving starts to look like something.
4. Check the table. Under the results is a table of common spending lines and the bucket each belongs to. Housing, groceries, the commute and minimum debt payments sit under needs; restaurants, subscriptions, hobbies and upgrades sit under wants. Sort your own last month against it before you trust the split.
5. Adjust if you need to. The three percentage fields start at 50, 30 and 20. If your needs already take more than half, change them to what is true and let the tool recalculate. The line under the fields tells you when the three shares stop adding up to 100. A reset button puts the standard split back.

What the split means here

The 50/30/20 rule comes from All Your Worth, a 2005 book by Elizabeth Warren and Amelia Warren Tyagi. Their argument was that most budgets fail because they ask people to track dozens of categories, and that three big buckets are enough to tell whether a financial life is in balance. The buckets are defined by what happens if you stop paying, not by how the spending feels.

Needs, 50 percent. These are the payments with consequences: rent or mortgage, utilities, groceries, the transport that gets you to work, insurance, a basic phone plan, childcare, and the minimum payment on every debt. If you missed one of these for two months, something would break, whether a lease, a credit score or a commute. The book calls these "must-haves" and treats their share of income as the single most important number in a budget, because it decides how much room everything else has.

Wants, 30 percent. This is everything you could pause for a month without real harm: eating out and delivery, streaming and other subscriptions, hobbies, gifts, travel, clothes beyond replacement, the nicer version of a thing you already have. The rule is generous here on purpose. A budget with no room for wants tends to last about six weeks.

Savings and debt payoff, 20 percent. An emergency fund, retirement contributions, a deposit you are building toward, and any payment on a debt above its minimum. Extra debt payments belong here rather than under needs because they are a choice that improves your position, the same as saving is. The calculator's savings figure is shown per year as well as per month for that reason: the monthly number is a habit, the yearly number is a result.

The calculator does three multiplications and nothing cleverer than that. Needs are take-home pay times the needs percentage, wants are pay times the wants percentage, and savings are pay times the savings percentage. The weekly figures divide by 4.33, the average number of weeks in a month, and the yearly savings figure multiplies by 12. That simplicity is the point. A rule you can work out in your head is a rule you will actually check against a bank balance.

Where the rule stops working

The 50/30/20 split is a shape, and shapes do not fit everyone. Here is where it bends or breaks.

When rent alone is close to 50 percent. In many cities, housing takes 35 to 45 percent of take-home pay for a single earner, which leaves five to fifteen points for every other need. The rule then produces a needs bucket that is already overspent before groceries. This is the most common reason the calculator gets used and then closed. The honest move is to change the split to what is true, perhaps 65/20/15, and treat the gap between that and 50/30/20 as a target for the next year or two, not a failing for this month. The low-income guide goes through the adjustments in order of how much they move the number.

When income is high. Someone on a large salary can meet every need at 25 percent of pay. The rule would hand them 30 percent for wants and stop the savings bucket at 20, when their situation would support 40 or more. Nothing in the rule prevents saving more, but its round numbers can quietly cap ambition. If your needs are well under half, the more useful split is needs as they are, savings as high as you can hold, and wants as what is left.

When the buckets blur. A car can be a need for the commute and a want in its trim level. Groceries are a need; the delivery fee on them is a want. A phone plan is a need; the newest phone on a two-year contract is mostly a want. The rule does not decide these cases for you, and a budget that files every gray-area expense under needs will report a needs bucket that looks unavoidable when a third of it is not. The needs-versus-wants guide is a longer treatment of the borderline cases.

When debt is large. With high-interest debt, the minimums sit under needs and everything above them under savings. That is correct, but it can make the savings bucket look healthy when nothing is actually being saved. If you are in that position, it is worth writing down inside the 20 percent how much is debt payoff and how much is a cushion, so that the cushion does not silently round to zero.

When the rule becomes a scorecard. The split is a diagnostic. If your needs are at 62 percent, the useful reaction is to know that and plan around it, not to feel that you have failed a test. Budget guidance from public bodies, including the Consumer Financial Protection Bureau's budget worksheet, starts from the same place: write down what is true first.

Worked examples

Example 1: the rule fits. Take-home pay is $3,600 a month. The calculator gives $1,800 for needs, $1,080 for wants and $720 for savings. Rent is $1,150, utilities and phone $180, groceries $380, transit pass $90 and a minimum card payment of $60, totalling $1,860. Needs are three percent over, which is close enough to hold the standard split and trim $60 from somewhere in the bucket, probably groceries. Wants at $1,080 a month, or about $250 a week, is comfortable. Savings at $720 a month comes to $8,640 a year.

Example 2: rent breaks the rule. Take-home pay is $2,400. The standard split gives $1,200 for needs, but rent alone is $1,050 and groceries, utilities, phone and transport add another $520, so real needs are $1,570, or 65 percent. Typing 65, 20 and 15 into the split fields gives $1,560 for needs, $480 for wants and $360 for savings, within $10 of the real needs figure. That is a budget this person can keep. It is not 50/30/20, and the point of writing it down is to see that the gap is about $370 a month of fixed cost, which is either a cheaper place at the next lease or a raise.

Example 3: high earner, low needs. Take-home pay is $8,000. Needs are $2,600, or 32 percent. The standard split would allot $2,400 for wants and $1,600 for savings. Setting the fields to 33/27/40 instead gives $2,640 for needs, $2,160 for wants and $3,200 for savings, or $38,400 a year. The wants bucket is still large; the savings bucket is doing the work the income allows.

From the number to the habit

A split on a page is a plan. What decides whether it survives is whether you can see, on an ordinary Tuesday, how much of the wants bucket is left. That is what Cash Book is for.

The calculator gives you a wants figure. In Cash Book that figure becomes a monthly allowance in Budgets, which shows under the big number on Home as an amount left, and turns red only when you are over. For the lines that keep escaping, groceries, eating out, whatever your gray area is, a per-tag budget with its own progress bar holds a smaller cap inside the bucket. The buckets are yours to define with tags and categories: a Wants category holding restaurant, delivery and subscription tags will report the whole bucket in one place on the Expenses tab.

The reason this works where spreadsheets stall is logging speed. Saying "fourteen fifty lunch" into the voice logger takes three seconds, a receipt through the camera takes about the same, and an Apple Pay tap can log itself. When every purchase lands the moment it happens, the allowance on Home is true, and a true number changes decisions in a way a monthly review never does.

If you want the wider routine around the split, how to make a monthly budget that sticks covers the first month, the review and the common ways a budget drifts. How to stop impulse buying is about the wants bucket specifically and why seeing the amount left is most of the cure.

The other tools

The split gives you a monthly wants figure; the daily spending allowance calculator turns it into a number per day for the rest of the month, which is easier to hold in your head at a checkout. The savings goal calculator takes the 20 percent and tells you when a specific target arrives. The subscription cost calculator adds up the recurring lines that usually hide inside wants. The small purchases calculator shows what a daily habit costs per month and per year, and the hours of work calculator reprices any purchase in the time it took to earn it.

Where to go next

Start with the number the calculator gives for wants and set it as a monthly allowance. Let one full month run, log everything, and then look at the Expenses tab in Insights to see how the real split compares to the one on this page. If needs came in above 50 percent, the low-income guide is the next read. If wants came in well above 30, the impulse-buying guide is. If the split fit, the savings figure is the number to automate, and the savings goal calculator will tell you what it buys and when.

The rule is not a test you pass. It is a way of seeing three numbers instead of thirty, and of noticing which one has been quietly moving.

Get Cash Book on the App StoreFree for 7 days. $19.99 once for lifetime.

Get Cash Book on the App StoreFree for 7 days. $19.99 once for lifetime.