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TryOwning · Foundations · Concept 3
Ticket 1 of 11, 0 done

Fixed vs. variable costs · 14 min

How many guests just to stay even?

Some costs show up whether or not anyone walks in. Others come with every guest. Knowing which is which tells you how many guests you need before you make a cent.

COFFEERENTGUESTS
Ticket 01 · Warm-upTable 1

Warm-up: a latte's margin

A quick one from the last lesson. A latte costs you $0.90 to make and sells for $5example(example number: Simplified example: a latte's menu price.). What's its gross margin?

What you know

What it costs you
$0.90example(example number: Simplified example: espresso, milk and a cup.)
Menu price
$5example(example number: Simplified example: a latte's menu price.)
%
Words to know

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Sources and every number (3 sources)

Sources

  • First Watch Restaurant Group annual report (Form 10-K), fiscal 2025 · First Watch Restaurant Group, Inc., filed with the U.S. Securities and Exchange Commission, 2025
  • Square fees: payment processing rates (Square Free plan) · Square (Block, Inc.)
  • Southwest Airlines Co. Form 10-K for the fiscal year ended December 31, 2025 · Southwest Airlines Co. (filed with the U.S. SEC), 2025

Every number

  • $0.90example(example number: Simplified example: espresso, milk and a cup.) · Simplified example: espresso, milk and a cup.
  • $5example(example number: Simplified example: a latte's menu price.) · Simplified example: a latte's menu price.
  • 82%example(example number: Worked out from the example cost and price.) · Worked out from the example cost and price.
  • $18example(example number: Simplified example: coffee and a brunch plate, the same café as the margins lesson.) · Simplified example: coffee and a brunch plate, the same café as the margins lesson.
  • $44,000example(example number: Simplified example: rent, the crew you schedule, the monthly bills and the interest on an equipment loan, added up.) · Simplified example: rent, the crew you schedule, the monthly bills and the interest on an equipment loan, added up.
  • 111 guests a dayexample(example number: Worked out from the example check and the cited food and card-fee rates, over a thirty-day month, and rounded.) · Worked out from the example check and the cited food and card-fee rates, over a thirty-day month, and rounded.
  • 81 guests a dayexample(example number: Worked out from the examples by dividing the fixed costs by the whole check, which leaves out food and card fees.) · Worked out from the examples by dividing the fixed costs by the whole check, which leaves out food and card fees.
  • 23.1%sec.gov ·2025 · First Watch, a daytime-café chain, fiscal 2025: food and beverage as a share of restaurant sales.
  • 2.6%squareup.com · Square's published rate for a tapped, dipped or swiped card.
  • $0.15squareup.com · Square's published fee per card payment, on top of the percentage.
  • $4.16example(example number: Worked out from the example check and the cited food and card-fee rates: food and drink on one check.) · Worked out from the example check and the cited food and card-fee rates: food and drink on one check.
  • $0.62example(example number: Worked out from the example check and the cited food and card-fee rates: the card fee on one check.) · Worked out from the example check and the cited food and card-fee rates: the card fee on one check.
  • $13.22example(example number: Worked out from the example check and the cited food and card-fee rates: the check minus food and drink and the card fee.) · Worked out from the example check and the cited food and card-fee rates: the check minus food and drink and the card fee.
  • 73.5%example(example number: Worked out from the example check and the cited food and card-fee rates: what each guest leaves, as a share of the check.) · Worked out from the example check and the cited food and card-fee rates: what each guest leaves, as a share of the check.
  • $59,900example(example number: Worked out from the examples and rounded: fixed costs divided by the contribution share.) · Worked out from the examples and rounded: fixed costs divided by the contribution share.
  • $7,000example(example number: Simplified example: rent and the other costs of the building.) · Simplified example: rent and the other costs of the building.
  • $24,000example(example number: Simplified example: the crew and a manager, scheduled ahead for the month.) · Simplified example: the crew and a manager, scheduled ahead for the month.
  • $12,600example(example number: Simplified example: utilities, insurance, repairs, software, marketing and supplies.) · Simplified example: utilities, insurance, repairs, software, marketing and supplies.
  • $400example(example number: Simplified example: a month's interest on an equipment loan.) · Simplified example: a month's interest on an equipment loan.
  • 3,328 guestsexample(example number: Worked out from the example check and the cited food and card-fee rates: fixed costs divided by what each guest leaves, using the per-guest amount rounded to the cent, as the sheet shows it.) · Worked out from the example check and the cited food and card-fee rates: fixed costs divided by what each guest leaves, using the per-guest amount rounded to the cent, as the sheet shows it.
  • $1,000example(example number: Simplified example: a rent increase.) · Simplified example: a rent increase.
  • 76 guestsexample(example number: Worked out from the examples and rounded: the rent increase divided by what each guest leaves.) · Worked out from the examples and rounded: the rent increase divided by what each guest leaves.
  • 2.5 guests a dayexample(example number: Worked out from the examples: the extra guests a month over a thirty-day month.) · Worked out from the examples: the extra guests a month over a thirty-day month.
  • 115 guests a dayexample(example number: Simplified example: the same café as the margins lesson.) · Simplified example: the same café as the margins lesson.
  • 7.5 hourssec.gov ·2025 · First Watch's restaurants are open about this long each day (its annual report, fiscal 2025).
  • $16example(example number: Simplified example: a coffee bar's average check.) · Simplified example: a coffee bar's average check.
  • $6,500example(example number: Simplified example: a small coffee bar's rent.) · Simplified example: a small coffee bar's rent.
  • $22,000example(example number: Simplified example: the coffee bar's scheduled crew for a month.) · Simplified example: the coffee bar's scheduled crew for a month.
  • $8,000example(example number: Simplified example: insurance, utilities and software.) · Simplified example: insurance, utilities and software.
  • $36,500example(example number: Worked out: the coffee bar's example fixed costs added up.) · Worked out: the coffee bar's example fixed costs added up.
  • $3.70example(example number: Worked out from the example check and the cited food share.) · Worked out from the example check and the cited food share.
  • $0.57example(example number: Worked out from the example check and Square's published rate.) · Worked out from the example check and Square's published rate.
  • $4.26example(example number: Worked out: food and drink plus the card fee on one check.) · Worked out: food and drink plus the card fee on one check.
  • $11.74example(example number: Worked out: the example check minus its variable costs.) · Worked out: the example check minus its variable costs.
  • 3,109 guestsexample(example number: Worked out from the examples and rounded: fixed costs divided by what each guest leaves.) · Worked out from the examples and rounded: fixed costs divided by what each guest leaves.
  • 104 guests a dayexample(example number: Worked out from the examples, over a thirty-day month, and rounded.) · Worked out from the examples, over a thirty-day month, and rounded.
  • 77.4%sec.gov ·2025 · Southwest's load factor, fiscal 2025: the share of seats filled, counted over the miles flown.
  • 161.2 seatssec.gov ·2025 · Average seats per flight, fiscal 2025.
  • 36 seatsexample(example number: Simplified example worked out from the annual report's averages: seats per flight times the share not filled. The load factor counts seat-miles, so this is a rough picture of one flight.) · Simplified example worked out from the annual report's averages: seats per flight times the share not filled. The load factor counts seat-miles, so this is a rough picture of one flight.
  • $27.6Bsec.gov ·2025 · Total operating expenses, fiscal 2025.
  • $13Bsec.gov ·2025 · Salaries, wages and benefits, fiscal 2025.
  • 46.9%sec.gov ·2025 · Salaries, wages and benefits as a share of operating expenses, fiscal 2025 (the annual report's own figure).
  • $5.2Bsec.gov ·2025 · Fuel and oil, fiscal 2025.
  • $2.2Bsec.gov ·2025 · Landing fees and airport rentals, fiscal 2025.
  • $1.6Bsec.gov ·2025 · Depreciation and amortization, fiscal 2025.
  • $1.2Bsec.gov ·2025 · Maintenance materials and repairs, fiscal 2025.
  • $4.5Bsec.gov ·2025 · Other operating expenses, fiscal 2025.
  • 15.35 centssec.gov ·2025 · Operating cost per available seat mile, fiscal 2025: what it cost to fly one seat one mile, empty or full.
  • 15.59 centssec.gov ·2025 · Operating revenue per available seat mile, fiscal 2025.
  • $28.1Bsec.gov ·2025 · Total operating revenues, fiscal 2025.
  • 1.5%sec.gov ·2025 · Operating income divided by operating revenues, fiscal 2025, worked out from the annual report.
  • 76%example(example number: Simplified example worked out from the annual report: the load factor times cost per seat-mile divided by revenue per seat-mile. It assumes revenue grows with passengers and costs don't.) · Simplified example worked out from the annual report: the load factor times cost per seat-mile divided by revenue per seat-mile. It assumes revenue grows with passengers and costs don't.
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