MrBudgeting.com offers 17 free budgeting calculators for everyday money decisions. Every tool runs entirely in your browser — nothing is sent anywhere. Pick a tool below to get started, or read the FAQ for plain-English answers to common budgeting questions.
Budgeting & spending
Monthly Budget Planner
Compare income to expenses and find your remaining balance
50/30/20 Calculator
Split take-home pay into needs, wants, and savings
Daily Spend Limit
Find your safe daily spending budget after bills and savings
Zero-Based Budget
Assign every dollar a job until your balance hits zero
Bill Split Calculator
Split a bill evenly or by custom amounts between friends
Freelance Rate Calculator
Work out your minimum hourly and day rate
Savings & investing
Savings Goal Calculator
See how long to reach a savings target, or work backwards from a deadline
Compound Interest Calculator
Project how money grows with compound interest over time
Emergency Fund Calculator
Find your 3 and 6 month fund targets and how long to reach them
Retirement Calculator
Project your nest egg and see if you're on track for your goals
Debt & loans
Debt Payoff Calculator
See your payoff date and total interest for any debt
Loan & Mortgage Calculator
Monthly repayments, total interest, and extra payment savings
Snowball vs Avalanche
Compare two debt repayment strategies side by side
Property & planning
Rent vs Buy Calculator
Compare the true cost of renting vs buying over any time period
Inflation Calculator
See how inflation erodes purchasing power over time
Pay Rise Calculator
Convert a salary increase to monthly and annual dollar figures
Net Worth Calculator
Total assets minus liabilities — your complete financial picture
Common questions
Budgeting basics, answered
Plain answers to the questions most people Google when they're trying to get their finances on track.
Start by writing down your total take-home income for the month, then list every expense — fixed costs like rent and subscriptions first, then variable ones like groceries and transport. Subtract your total expenses from your income to see what's left. If the number is negative, look at where you can cut back. If it's positive, decide in advance where that money goes: savings, debt repayment, or a specific goal. Use our Monthly Budget Planner to run through it in minutes.
The 50/30/20 rule divides your take-home pay into three buckets: 50% for needs (rent, food, bills, transport), 30% for wants (dining out, entertainment, hobbies), and 20% for savings and debt repayment. It was popularised by US Senator Elizabeth Warren and gives you a simple starting framework. Adjust the percentages to fit your situation — if you live somewhere expensive, your needs will naturally sit higher. Try our 50/30/20 Calculator to see your exact split.
Most financial planners suggest three to six months of essential living expenses in an easily accessible account. Three months is a reasonable first target; six months gives more cushion if you're self-employed, have dependants, or work in a sector with volatile job security. Use our Emergency Fund Calculator to find your targets and how long it'll take to get there.
Two popular approaches are the avalanche method (highest-interest debt first, minimises total interest) and the snowball method (smallest balance first, builds motivation). Either way, paying more than the minimum each month is the key lever. Try our Debt Payoff Calculator to see exactly how much difference an extra payment makes, or use the Snowball vs Avalanche tool to compare both strategies side by side.
Compound interest means you earn returns not just on your starting amount but on the interest already accumulated. The longer money is invested, the faster it grows — making time the most powerful variable in long-term saving. Even small monthly contributions, started early, can compound into substantial wealth. Use our Compound Interest Calculator to see the numbers for yourself.
There's no universal answer — it depends on how long you plan to stay, what property prices do, what you'd invest instead of a deposit, and your personal circumstances. Buying is not automatically better than renting. Use our Rent vs Buy Calculator to model both scenarios over your chosen time horizon with your actual numbers.