A break-even chart is the visual way of showing the same information as the break-even formula — output (units) is plotted along the bottom (x) axis, and cost/revenue in £ up the side (y) axis. It's built up in steps:
Fixed costs (FC) line: a flat, horizontal line, since fixed costs don't change with output.
Total costs (TC) line: starts at the same point as the fixed costs line (since at zero output, total costs equal fixed costs) and slopes upward as variable costs are added for each extra unit made.
Total revenue (TR) line: starts at £0 (zero output means zero revenue) and slopes upward more steeply than the TC line, assuming each unit sells for more than its variable cost.
Break-even point: found where the total revenue line crosses the total costs line. Reading down to the x-axis from this point gives the break-even output in units.
Two areas are usually shaded or labelled once the chart is complete: the area of loss, below the break-even point (where TC is above TR), and the area of profit, above the break-even point (where TR is above TC). The margin of safety can also be marked on the chart as the horizontal distance between the break-even output and the business's actual output.
Real-World Case Studies
Airlines — break-even measured as a "load factor"
Airlines have their own version of a break-even chart, expressed as a load factor: the percentage of seats on a flight that need to be filled before the flight covers its costs. Industry estimates put this break-even load factor at roughly 66-70% on average, though it varies by airline's cost structure. In 2025, Ryanair reported load factors around 93%, well above its break-even point, while budget carrier Allegiant ran at around 80% — both comfortably inside their "area of profit," in break-even chart terms, while a flight filled below that break-even percentage would sit in the loss area of the same chart.
Source: verified via search, September 2026 — Simple Flying and Analyst Interview coverage of airline break-even load factors, and 2025 traffic reporting via TradingView/Zacks.
West End theatre — high fixed costs mean a high break-even occupancy
Running a West End show involves very high fixed costs — theatre rental, cast and crew salaries, set and marketing costs — that have to be paid whether the show is full or half-empty. Industry commentary on West End economics commonly cites a play needing occupancy somewhere around 70% of seats sold just to break even, and some smaller or more expensive productions needing occupancy as high as 90%. On a break-even chart, this shows up as a fixed costs line sitting high up the y-axis relative to ticket revenue per seat, which pushes the break-even point a long way to the right — explaining why so many shows close quickly if reviews or word-of-mouth don't drive strong ticket sales.
Source: verified via search, September 2026 — trade coverage of West End show economics (The Stage, tickadoo); exact break-even occupancy varies by venue and production, so treated qualitatively here rather than as one precise figure.
Command Word Match
Tap a break-even chart instruction, then tap what it actually means.
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Quick Knowledge Check
Short, snappy recall questions — tap to reveal the answer.
On a break-even chart, which line is flat (horizontal)? (1 mark)
The fixed costs line.
Where is the break-even point found on a chart? (1 mark)
Where the total revenue line crosses the total costs line.
Where does the total revenue line start on a break-even chart? (1 mark)
At £0, since zero output means zero revenue.
What is shown by the area below the break-even point on a chart? (1 mark)
The area of loss, where total costs are higher than total revenue.
Key Term Flashcards
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Total costs line
Starts at the fixed costs value on a break-even chart and slopes upward as variable costs are added with each extra unit.
Total revenue line
Starts at £0 on a break-even chart and slopes upward more steeply than the total costs line.
Area of loss
The area on a break-even chart below the break-even point, where total costs are higher than total revenue.
Area of profit
The area on a break-even chart above the break-even point, where total revenue is higher than total costs.
A*/A Stretch
Examiner's eye
If asked to interpret (not draw) a break-even chart, always describe what happens to the whole chart, not just one line, when something changes — e.g. a rise in the selling price rotates the total revenue line to be steeper AND moves the break-even point to the left, since fewer units are now needed to cover costs.
Synoptic link
Connecting to the formula method (L4, this unit): A break-even chart and the break-even formula always describe the exact same underlying maths — a strong exam answer can move between the two, e.g. reading an approximate break-even output off a chart, then explaining that this matches Fixed Costs ÷ Contribution per unit.
Try This With AI
Before using this: AI tools can get facts or mark scheme details wrong, and quality varies by tool. Always check anything factual against your notes or ask your teacher.
Describe a change to a fictional business's costs or prices (e.g. "fixed costs rise by £2,000" or "selling price falls by £1"). Ask me to explain what would happen to the break-even chart — which line moves, which way, and what happens to the break-even point and margin of safety. Then tell me if my explanation was accurate and complete.