FIFO Roster Budget Calculator: How to Budget by Swing, Not by Month
Disclosure: We make SwingSheet (and SwingSheet Lite and BotRoster) under the Autofold name, and we sell them. Drafted with AI assistance and fact-checked by us.
General information only, not financial advice.
If you work fly-in fly-out, a normal monthly budget probably never quite fits. Your pay follows your roster. Your rent, phone, insurance and car loan follow the calendar. The two drift in and out of sync, and the month with a big swing feels flush while the next one feels tight, even when your yearly income hasn't changed.
A FIFO roster budget calculator fixes that by switching the unit of time. Instead of asking "what can I spend this month?", you ask "what can I spend this swing?" This guide walks through the method by hand, so you can do it on paper, in any spreadsheet, or with a free template.
Why monthly budgets break on a roster
Most budgeting apps and templates assume one salary paid on the same date each month. FIFO rosters don't work like that:
- A 2:1 roster (two weeks on, one off) is a 21-day cycle. That doesn't divide neatly into a 30 or 31-day month, so some months contain more of your swing than others.
- An 8:6 roster is a 14-day cycle, which lines up with fortnightly pay but not with monthly bills.
- A 14:7 roster is the same 21-day length as a 2:1 with a different pattern of days.
- Overtime, allowances and shift penalties change with the roster, so pay itself can vary from swing to swing.
The result is that a monthly budget keeps "surprising" you. Bills cluster on certain weeks, and very often they land during R&R, when you're home and spending more anyway.
Step 1: Pick your cycle length
Write down your roster as days on plus days off. That total is your cycle:
| Roster | Days on | Days off | Cycle length |
|---|---|---|---|
| 2:1 | 14 | 7 | 21 days |
| 8:6 | 8 | 6 | 14 days |
| 14:7 | 14 | 7 | 21 days |
| 4:4 (even time) | 4 | 4 | 8 days, often budgeted as a fortnight |
Everything below is calculated per cycle.
Step 2: Enter your net pay for one swing
Use your take-home pay, not your gross. If your pay varies, use your base pay for a normal swing and leave overtime out for now. That one choice does more for a FIFO budget than any app: your fixed costs get covered by money you can count on, and the extra becomes a bonus instead of something you depend on.
Step 3: Convert your fixed bills into "per swing" amounts
For each bill, convert it to the cycle:
- Monthly bill: amount × 12 ÷ 365 × cycle days
- Quarterly bill: amount × 4 ÷ 365 × cycle days
- Yearly bill: amount ÷ 365 × cycle days
- Weekly bill: amount ÷ 7 × cycle days
For example, on a 21-day cycle a monthly phone bill becomes the bill × 12 ÷ 365 × 21. Do this for rent or your mortgage share, utilities, phone, internet, insurance, rego, subscriptions and minimum loan repayments.
This is the part a calculator saves you: the conversion is simple maths, but doing it for 15 bills every time something changes is where people give up.
Step 4: Split variable spending into on-site and at-home
FIFO spending has a shape. On site, most of your food and accommodation is usually covered, so day-to-day spending is low. At home it jumps: groceries, fuel, eating out, kids' activities, catching up with mates.
So budget variable spending in two buckets:
- Swing days: usually small (phone credit, camp extras, travel to the airport).
- R&R days: groceries, fuel, family, social.
When people say "I blow it all on R&R", it's often because their budget never gave R&R its own line.
Step 5: Work out what's left per swing
Now the core formula:
Left over per swing = net pay for the swing − fixed bills (per swing) − variable spending (swing + R&R)
Then divide by the cycle days to get a per-day number. That figure is useful when you're deciding whether something fits this swing or should wait for the next.
If the number is negative, you've learned something important before the bills arrive, not after.
Step 6: Decide where the surplus goes
Once you know your surplus per swing, choose a rule and stick to it. Common approaches:
- Buffer first: build a buffer equal to one swing's fixed costs, which covers a cancelled swing, injury or a gap between contracts.
- Debt next: extra repayments on the highest-interest debt.
- Goals: deposit savings, holidays, investing.
Which order is right depends on your situation, and that's where personal advice from a licensed professional matters. The calculator only shows you the numbers.
Common mistakes
- Budgeting on your best swing. Use a normal one. Let the good swings surprise you.
- Forgetting annual bills. Rego and insurance hit hard when they land on a short-pay cycle. Convert them to per-swing amounts and set the money aside every swing.
- Ignoring travel days. Flights may be paid for, but getting to the airport, parking and meals on travel days add up.
- One budget for a changing roster. If you move from 8:6 to 2:1, redo Steps 1 to 5.
A free FIFO roster budget calculator
If you want this ready-made, SwingSheet Lite is a free one-swing spreadsheet: enter your days on, days off and net pay, list your bills and spending, and it shows what's left for the swing and per day. Get SwingSheet Lite (free).
When you want every swing tracked over time, plus debt payoff and a dashboard, the full SwingSheet (A$19) does that in Excel or Google Sheets: SwingSheet on Gumroad.
FAQ
Is a FIFO budget different from a normal budget? The categories are mostly the same. The timing is what changes: you budget per cycle, and R&R gets its own line.
What if my roster changes every few months? Redo the cycle length and per-swing conversions. A spreadsheet makes that a two-minute job.
Should I include overtime? Many FIFO workers budget fixed costs on base pay and treat overtime as extra. That's a common approach, not a rule. Your circumstances may differ.
Made by Autofold. General information only, not financial advice.