50/30/20 Budget Calculator
Enter your monthly take-home income and a target split. The calculator divides your paycheck into needs, wants, and savings, and shows what each bucket is worth annually.
Monthly amount to save
£1,000.00
- Needs (50%)
- £2,500.00
- Wants (30%)
- £1,500.00
- Savings (20%)
- £1,000.00
- Annual savings
- £12,000.00
Based on a monthly take-home income of 5000.00, this allocation puts 2500.00 toward needs (housing, food, transport, minimum debt payments), 1500.00 toward wants (dining, entertainment, subscriptions), and 1000.00 toward savings and extra debt repayment. The default 50/30/20 split comes from Elizabeth Warren's book "All Your Worth"; the calculator lets you adjust the needs and wants percentages, and the savings share is whatever is left over.
How to use this calculator
Enter your monthly take-home income — the amount that actually arrives in your bank account after tax, national insurance or social security, and any pension or 401(k) contributions. Then set the share you want to allocate to needs (housing, food, transport, minimum debt payments) and the share you want to allocate to wants (dining out, entertainment, subscriptions, hobbies). Whatever is left over becomes your savings rate, which the calculator shows alongside the monthly and annual amount.
How the calculation works
The 50/30/20 rule comes from Elizabeth Warren and Amelia Warren Tyagi's 2005 book "All Your Worth: The Ultimate Lifetime Money Plan." The defaults are 50% to needs, 30% to wants, and 20% to savings (and extra debt repayment beyond the minimums). The calculator generalises this — you pick any percentages for needs and wants, and savings is the remainder (100 − needs − wants). If your needs and wants add up to more than 100%, you are overspending: the calculator flags it and shows how much short you would be each month.
Worked example
Example: £4,000 monthly take-home, 50% to needs, 30% to wants. Needs = 4,000 × 0.50 = £2,000. Wants = 4,000 × 0.30 = £1,200. Savings = 4,000 × 0.20 = £800 per month, or £9,600 a year. Bump the savings rate to 30% by dropping wants to 20%: savings jumps to £1,200 a month and £14,400 a year, at the cost of £400 less monthly discretionary spending.
Frequently asked questions
What is the 50/30/20 budget rule?
It is a popular framework for splitting after-tax income: 50% to needs, 30% to wants, 20% to savings and extra debt repayment. The rule was introduced by Elizabeth Warren and Amelia Warren Tyagi in their 2005 book "All Your Worth: The Ultimate Lifetime Money Plan." It is meant as a starting point, not a strict prescription — high earners often save more than 20%, and people in high-cost cities may need more than 50% just for housing.
What counts as a "need" versus a "want"?
Needs are things you cannot reasonably do without: rent or mortgage, utilities, basic groceries, transport to work, insurance, and minimum required debt payments. Wants are anything optional: dining out, streaming services, holidays, gym memberships, premium phone plans, gifts. The line is fuzzy — a car may be a need in a rural area and a want in central London — so use your own judgement. Anything above the minimum required payment on a debt (paying extra on a credit card) counts toward the savings bucket, not the needs bucket.
Should I use gross income or take-home pay?
Take-home pay — the amount that lands in your bank account after tax, national insurance or social security, and any automatic pension or 401(k) deductions. Using gross income would double-count those deductions, since you never actually have that money to allocate. If your pension contribution is the main thing you would otherwise call "savings", you can either count it inside the 20% bucket (use gross income) or exclude it (use net pay and treat the 20% as additional savings on top of your pension).
What if I can't save 20%?
That is common, especially early in a career or in expensive areas. The calculator lets you set any allocation — start with whatever savings rate is achievable (even 5%) and increase it over time as your income grows. The point of the framework is to make the split conscious rather than letting wants expand to absorb the difference. Conversely, if you can save 30% or 40%, raising the savings share is one of the highest-leverage things you can do for long-term financial security.
Does this work in any currency?
Yes — the maths is just percentages of the income figure you enter, so the unit does not matter. The results display in pounds sterling because the site's formatter is currently fixed to GBP, but you can read the numbers as your own currency. £2,500 in needs on a £5,000 income is the same proportion as $2,500 on $5,000, €2,500 on €5,000, or any other currency. Convert in your head if needed; the budget split is identical.
How does this compare to other budget frameworks?
The 70/20/10 rule allocates 70% to all spending (needs and wants combined), 20% to savings, and 10% to debt repayment or charitable giving. The 80/20 rule (sometimes called "pay yourself first") puts 20% straight into savings and lets you spend the rest however you like, with no needs/wants distinction. Zero-based budgeting goes the other way — every pound has a job, planned line by line. The 50/30/20 split is more structured than 80/20 and less granular than zero-based budgeting, which is why it suits most beginners.