--- title: "Calculate Your Personal Runway With an AI Agent (No Spreadsheet)" slug: personal-runway-calculator url: https://bankbridge.money/guides/personal-runway-calculator category: how-to published: 2026-07-10 updated: 2026-07-10 --- # Calculate Your Personal Runway With an AI Agent (No Spreadsheet) > Your personal runway is your liquid cash divided by your true monthly burn. Ask an agent connected to your bank through BankBridge: it pulls checking and savings balances live, averages six months of real spending from monthly cashflow (excluding card-bill payments and inter-account transfers), and divides. Most people get an answer in under a minute, and it's accurate to today's balances. Calculate Your Personal Runway With an AI Agent | BankBridge | BankBridge [How-to](/guides/how-to) # Calculate Your Personal Runway With an AI Agent (No Spreadsheet) Updated Jul 10, 2026ยท6 min read Your personal runway is your liquid cash divided by your true monthly burn. Ask an agent connected to your bank through BankBridge: it pulls checking and savings balances live, averages six months of real spending from monthly cashflow (excluding card-bill payments and inter-account transfers), and divides. Most people get an answer in under a minute, and it's accurate to today's balances. ## What personal runway actually is Personal runway is the number of months you could keep living your current life if income stopped tomorrow. The math is one division: liquid cash divided by true monthly burn. If you've got $24,000 across checking and savings and you spend $4,000 a month, you have six months. The formula isn't the hard part. The inputs are. Most people know their balance within a few hundred dollars but have genuinely no idea what they spend in a real month. Ask someone their burn and you'll usually get their rent plus a hopeful guess. Searches for personal runway jumped alongside layoffs and the shift to freelancing, and the tools that rank for the question are static calculators: two empty boxes asking you to type in numbers you don't actually know. This guide is the opposite. One prompt, real data, a defensible answer. ## Where the spreadsheet version goes wrong The classic approach is to export a few months of statements, build a spreadsheet, and sum the outflows. It fails in three predictable ways. First, double counting. Your card swipes show up as spending on the credit card statement, then the bill payment shows up again as a big outflow from checking. Sum both and your burn roughly doubles, which cuts your calculated runway in half. It's the single most common error in DIY burn math. Second, transfers. Moving $1,000 from checking to savings isn't spending, but it looks like an outflow. Meanwhile a monthly bank transfer to your landlord absolutely is spending, even though it's labeled a transfer. A naive sum gets both wrong, in opposite directions. Third, staleness. The spreadsheet is accurate for about a week, then it drifts. And if you only looked at one month, you've got a bonus problem: one quiet February makes you feel richer than you are. ## The one-prompt runway calculator Here's the whole recipe. Connect your bank to your agent through BankBridge (a five-minute setup, covered in our connection guide), then paste this: > Calculate my personal runway. First, pull my current checking and savings balances and total them. Then work out my average monthly burn over the last six full months from monthly cashflow: include card spending, bills, and any transfers that are really payments to other people, like rent. Exclude credit card bill payments and transfers between my own accounts so nothing gets counted twice. Divide total cash by average burn and give me runway in months, showing the numbers you used. That's it. The same prompt works in Claude, Claude Code, ChatGPT, Cursor, or any of the other MCP hosts BankBridge supports. The agent does the pulling, the excluding, and the math. The "showing the numbers you used" clause matters more than it looks. It turns the answer from a black box into something you can sanity-check in ten seconds. ## What the agent actually does Behind the scenes, a few of BankBridge's 11 tools do the work. list\_accounts finds your depository accounts and their live balances. get\_monthly\_cashflow returns income and spending for each of the last six months. list\_transactions and search\_transactions let the agent inspect anything ambiguous, like a recurring transfer it needs to classify as rent or as a move to savings. Balances are fetched live at the moment you ask. BankBridge doesn't cache your data on its servers, so you're not getting last night's sync or last week's snapshot. If a paycheck landed an hour ago, it's in the number. No exports, no CSV cleanup, no formulas to maintain. ## Getting the burn number honest The exclusions in the prompt deserve a closer look, because they're the difference between a real runway number and a scary-looking wrong one. When you pay a credit card bill from checking, that payment covers swipes that already appeared as individual transactions. Count both and every dollar of card spending gets counted twice. If you put most of your life on cards, this error alone can make a nine-month runway read as four and a half. Transfers cut the other way. A transfer to your own savings or brokerage isn't burn; it's your money changing rooms. But a transfer to another person (a landlord, a family member you support, a shared-bills account you don't own) is real spending and has to stay in. Good agents catch the pattern, same amount on the same day each month with a name in the memo, and will ask if they're unsure. If you want the strict version, tell the agent to also subtract your current credit card balances from liquid cash. That's money you've spent but haven't paid yet. ## Reading the number, then stress-testing it A rough scale: under three months is tight, three to six is workable, six to twelve is comfortable, and past twelve you have real options. Freelancers and anyone with lumpy income should aim toward the high end, since the whole point of runway is surviving the gap between paydays. The average-burn number is the honest baseline, but it's worth asking two follow-ups once you have it: > What would my runway be if I used my highest-spend month from the last year instead of the average? > Recalculate my runway assuming I cut subscriptions, delivery, and restaurants. How many months does that buy me? The first is your pessimistic case. The second is your lean case, the number that matters if the income actually stops. Having all three takes about ninety seconds once the connection exists. ## Keep it live instead of rebuilding it The best part of doing this with an agent is that there's nothing to maintain. Next month, ask again and you'll get next month's answer, with fresh balances and a rolling six-month burn. The spreadsheet version decays. This one doesn't. If you don't have a bank connected yet, setup is short: create an account at bankbridge.money, connect a bank, and add the server to your agent. It's $5 a month per connected bank, read-only always, cancel anytime. Then the prompt above is the first thing worth asking. ## FAQ How do I calculate how many months of runway I have? Divide your liquid cash (checking plus savings) by your true average monthly burn. Compute burn from the last six months of transactions, excluding credit card bill payments and transfers between your own accounts so spending isn't counted twice. An AI agent connected to your bank can do this from one prompt. What counts as monthly burn for a runway calculation? Every dollar that leaves your accounts and doesn't come back: card spending, rent, utilities, cash withdrawals, and transfers to other people. Exclude credit card bill payments (those swipes were already counted) and moves between your own checking and savings, which aren't spending at all. Why shouldn't I include credit card payments in my burn? Because the spending behind them was already counted as individual card transactions. If you count a $3,000 card bill and the $3,000 in swipes it covers, your burn doubles and your runway looks half as long as it really is. How many months of personal runway is enough? Three months is a common minimum, six is comfortable for most salaried people, and freelancers or anyone with irregular income usually want nine to twelve. The right target depends on how quickly you could realistically replace your income if it stopped tomorrow. Is it safe to let an AI agent see my bank data for this? With BankBridge, access is read-only, so an agent can see balances and transactions but can never move money. Data is fetched live at question time and isn't stored on BankBridge servers. It costs $5 per month per connected bank, and you can cancel anytime. ## FAQ ### How do I calculate how many months of runway I have? Divide your liquid cash (checking plus savings) by your true average monthly burn. Compute burn from the last six months of transactions, excluding credit card bill payments and transfers between your own accounts so spending isn't counted twice. An AI agent connected to your bank can do this from one prompt. ### What counts as monthly burn for a runway calculation? Every dollar that leaves your accounts and doesn't come back: card spending, rent, utilities, cash withdrawals, and transfers to other people. Exclude credit card bill payments (those swipes were already counted) and moves between your own checking and savings, which aren't spending at all. ### Why shouldn't I include credit card payments in my burn? Because the spending behind them was already counted as individual card transactions. If you count a $3,000 card bill and the $3,000 in swipes it covers, your burn doubles and your runway looks half as long as it really is. ### How many months of personal runway is enough? Three months is a common minimum, six is comfortable for most salaried people, and freelancers or anyone with irregular income usually want nine to twelve. The right target depends on how quickly you could realistically replace your income if it stopped tomorrow. ### Is it safe to let an AI agent see my bank data for this? With BankBridge, access is read-only, so an agent can see balances and transactions but can never move money. Data is fetched live at question time and isn't stored on BankBridge servers. It costs $5 per month per connected bank, and you can cancel anytime.