Free student business lab
Turn simulator results, downloaded CSVs, or classroom assumptions into transparent calculations. Everything runs in your browser with no account, upload, or saved personal data.
Use break-even for volume thresholds, unit economics for contribution, labor ratio for payroll sustainability, RevPAR for yield, runway for liquidity, and LTV:CAC for marketing efficiency.
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Export a CSV run record from any of the 18 business simulators, then drop it here to automatically populate and recalculate every business formula below.
Calculator 1
Find the minimum sales volume required to cover fixed overhead at your current unit selling price and variable cost.
contribution margin = price − variable cost
break-even units = fixed costs ÷ contribution margin
Common pitfalls:
Calculator 2
Analyze how unit volume, unit pricing, variable costs, and fixed overhead combine to generate total period operating profit and profit margin.
revenue = units sold × unit price
total contribution = units sold × (price − variable cost)
profit = total contribution − fixed costs
profit margin = (profit ÷ revenue) × 100
Unit economics show whether scaling volume creates sustainable cash flow or multiplies operating losses.
Calculator 3
Compare a baseline price and volume against a tested price change to evaluate the profit difference and required volume to stay whole.
A model comparison shows what follows from the inputs. It does not discover real customer demand by itself.
Calculator 4
Evaluate payroll percentage of revenue, hourly staffing efficiency, and required revenue targets.
total labor cost = hourly wage × staff hours
labor ratio = (total labor cost ÷ revenue) × 100
Industry rules of thumb:
When labor ratio climbs above 40% in food or retail, check scheduling, prep waste, and peak-hour staffing.
Calculator 5
Calculate occupancy, Revenue Per Available Room/Unit (RevPAR), yield, and unfilled capacity value.
utilization rate = (units sold ÷ total capacity) × 100
RevPAR = total revenue ÷ total available units
RevPAR combines pricing power and occupancy into a single measure. A property with 100% occupancy at a steep discount can generate less revenue than 70% occupancy at premium rates.
Unrealized capacity: Unsold rooms, empty tables, and open court hours perish forever once the day closes.
Calculator 6
Calculate net monthly cash burn, liquidity runway in months, and zero-cash safety dates.
net burn rate = monthly outflows − monthly inflows
usable cash = starting cash − reserve buffer
runway (months) = usable cash ÷ net burn rate
Liquidity guardrails:
Calculator 7
Evaluate customer acquisition efficiency, gross margin lifetime value, and LTV:CAC marketing return.
CAC = total marketing spend ÷ new customers
LTV = AOV × gross margin % × lifetime purchases
LTV:CAC ratio = customer LTV ÷ blended CAC
Rule of thumb benchmarks:
Calculator 8
Compare product gross profit, gross margin percentage on selling price, and markup percentage on cost.
gross profit = selling price − unit cost
gross margin % = (gross profit ÷ selling price) × 100
markup % = (gross profit ÷ unit cost) × 100
Key concept: Margin is calculated as a share of selling price, whereas markup is calculated on top of cost. A 100% markup corresponds to a 50% gross margin.
Calculator 9
Evaluate balance sheet short-term liquidity, net working capital cushion, current ratio, and quick ratio (acid test).
net working capital = current assets − current liabilities
current ratio = current assets ÷ current liabilities
quick ratio = (cash + receivables) ÷ current liabilities
Liquidity health bands:
Calculator 10
Calculate inventory velocity, average days to sell stock, and estimated annual carrying cost burden.
inventory turnover = COGS ÷ average inventory
DSI (days to sell) = (average inventory ÷ COGS) × days
annual holding cost = average inventory × holding rate %
Sector turnover benchmarks:
Calculator 11
Estimate capital expenditure return, net lifetime profit gain, simple payback period, and annualized ROI.
total lifetime gain = (annual benefit × lifespan) − initial cost
ROI % = (total lifetime gain ÷ initial cost) × 100
payback period (years) = initial cost ÷ annual net benefit
Evaluation rule: A capital upgrade is financially attractive when the payback period is well under the asset's useful lifespan and ROI exceeds the cost of capital.
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Explore our comprehensive suite of quantitative business modeling tools, risk analysis frameworks, and operational simulators. Every lab features dynamic sensitivity analysis, preset benchmarks, and one-click CSV export with formula injection defense.
Classroom activity
For a longer sequence, pair the lab with the financial literacy lesson, accounting lesson, or a printable simulator worksheet.
Calculator inputs and uploaded CSVs stay in the current browser page and are not saved or transmitted by this tool. Do not enter names, account numbers, confidential business figures, or other personal information. Use invented classroom figures or appropriately shared aggregate data.
The calculations simplify taxes, debt, interest, payment timing, depreciation, returns, discounts, waste, insurance, permits, legal obligations, and capacity. They are educational estimates—not financial, investment, tax, accounting, or legal advice. Verify current facts and applicable rules before making a real decision.
FAQ
Break-even units equal fixed costs divided by selling price minus variable cost per unit. If price does not exceed variable cost, there is no finite break-even volume.
Unit economics compare the revenue and variable cost connected to one unit, customer, order, booking, or service. Period fixed costs are then deducted to estimate operating profit.
Keep the time period, product, variable cost assumption, and fixed-cost assumption consistent. Compare both price and expected sales volume, then explain uncertainty rather than treating the estimate as a forecast.
For most hospitality, restaurant, and retail businesses, labor typically targets 25% to 35% of total revenue. Service-intensive businesses such as childcare, auto repair, or consulting often operate with labor between 40% and 55%.
Revenue Per Available Room or Unit (RevPAR) combines pricing power and capacity utilization into a single metric. It shows how effectively fixed capacity generates revenue regardless of whether rates or occupancy fluctuate.
Net monthly burn rate is monthly cash outflows minus monthly cash inflows. Cash runway in months equals available cash divided by net monthly burn rate. If cash flow is positive, runway is self-sustaining.
Gross margin is gross profit divided by selling price (percentage of revenue), while markup is gross profit divided by unit cost (percentage added on top of cost). A 100% markup corresponds to a 50% gross margin.
A current ratio of 1.5x or higher indicates a healthy liquidity buffer. A ratio between 1.0x and 1.4x is adequate but sensitive to collection delays, while a ratio under 1.0x represents a working capital deficit.
Days Sales in Inventory equals average inventory divided by Cost of Goods Sold (COGS), multiplied by the number of days in the period. Lower DSI reflects faster inventory turnover and reduced holding costs.
Simple ROI is total net lifetime gain divided by initial investment, expressed as a percentage. Simple payback period is initial investment divided by annual net cash inflow.
A standard benchmark for customer acquisition is an LTV:CAC ratio of 3:1 or higher. A ratio below 1:1 loses money on every customer acquired, while 1:1 to 2:1 is marginal and leaves little room for fixed overhead.
No. Calculations run in the browser, and this page does not save calculator inputs or require an account.
No. The results are simplified educational estimates and omit taxes, financing, timing, legal requirements, and many real operating costs.
Build full multi-period forecasts with the 12-Month Pro-Forma Financial Model Generator, or apply these calculations to food truck location demand, bakery production and waste, bookstore inventory, motel room revenue management, or childcare enrollment and staffing. Use the managerial accounting lesson to connect contribution, break-even, relevant costs, and variances; turn results into an accurate display with the business chart and data visualization guide; or browse the complete resource index.