# Break-even calculator

> Calculate the break-even point in units and sales revenue from fixed costs, price and variable cost, plus the volume needed for a target profit.

操作できるページ：https://www.calcopenly.com/ja/finance/break-even-calculator
分野：お金の計算機

The break-even point is the sales volume at which revenue equals total cost. Each unit sold contributes its price minus its variable cost, the contribution margin, toward fixed costs, so the break-even volume is Q = F ÷ (p − v). Break-even revenue is the fixed costs divided by the contribution margin ratio, (p − v) ÷ p.

With the defaults, fixed costs of 50,000, a price of 25 and a variable cost of 15 per unit, each unit contributes 10, a 40% margin ratio. Break-even comes at 5,000 units, or 125,000 of revenue, and a target profit of 20,000 would take 7,000 units.

The model is linear: price and variable cost per unit stay constant, and fixed costs do not step up as volume grows. Break-even units are rounded up, because one unit fewer would leave a small loss.

## 入力

- **Fixed costs**: Rent, salaries and other costs that don't change with volume, for the period
- **Price per unit**
- **Variable cost per unit**: Materials, packaging, commissions — costs that scale with each unit
- **Target profit**

## 結果

- Break-even units (units) — 主な結果
- Break-even units (exact) (units)
- Break-even revenue
- Contribution margin per unit
- Contribution margin ratio
- Units for target profit (units)
- Revenue for target profit

## 計算式

$$
Q_{BE} = \frac{F}{p - v},\qquad R_{BE} = \frac{F}{(p - v)/p}
$$

## 計算例

### Fixed 50,000, price 25, variable cost 15

- Fixed costs: 50,000
- Price per unit: 25
- Variable cost per unit: 15
- Target profit: 0
- **Break-even units: 5,000 units**
- **Break-even revenue: 125,000.00**
- **Contribution margin per unit: 10.00**
- **Contribution margin ratio: 40%**
- 照合元：Python decimal: 50000 / (25 − 15) = 5000 units; 5000 × 25 = 125000

### Fractional break-even rounds up

- Fixed costs: 10,000
- Price per unit: 7
- Variable cost per unit: 4
- Target profit: 0
- **Break-even units: 3,334 units**
- **Break-even units (exact): 3,333.3333 units**
- **Break-even revenue: 23,333.33**
- **Contribution margin ratio: 42.86%**
- 照合元：Python decimal: 10000 / 3 = 3333.33…, ceiling 3334; revenue 10000 / (3/7) = 23333.33

### Zero fixed costs

- Fixed costs: 0
- Price per unit: 12
- Variable cost per unit: 7.5
- Target profit: 0
- **Break-even units: 0 units**
- **Break-even revenue: 0.00**
- **Contribution margin per unit: 4.50**
- **Contribution margin ratio: 37.5%**
- 照合元：Python decimal: 0 / 4.5 = 0 — every unit sold is profit from the first

### Target profit 20,000

- Fixed costs: 50,000
- Price per unit: 25
- Variable cost per unit: 15
- Target profit: 20,000
- **Units for target profit: 7,000 units**
- **Revenue for target profit: 175,000.00**
- **Break-even units: 5,000 units**
- 照合元：Python decimal: (50000 + 20000) / 10 = 7000 units; × 25 = 175000

## よくある質問

### How do you calculate the break-even point?

Divide fixed costs by the contribution margin per unit, price minus variable cost. With fixed costs of 50,000, a price of 25 and a variable cost of 15, break-even is 50,000 ÷ 10 = 5,000 units. When the division is not whole, round up: 10,000 ÷ (7 − 4) = 3,333.33, so 3,334 units are needed.

### What is the contribution margin?

The contribution margin is what each sale leaves after its variable costs, available to cover fixed costs and then profit: price − variable cost per unit. At a price of 25 and a variable cost of 15 it is 10 a unit. As a share of price, the contribution margin ratio, it is 10 ÷ 25 = 40%.

### How do you calculate break-even in sales revenue?

Divide fixed costs by the contribution margin ratio. With 50,000 of fixed costs and a 40% ratio, break-even revenue is 50,000 ÷ 0.40 = 125,000, the same as 5,000 units × 25. The revenue form is useful when a business sells many products with a similar margin ratio.

### How many units do I need to sell to make a target profit?

Add the target profit to the fixed costs and divide by the contribution margin: (F + target) ÷ (p − v). Earning 20,000 on top of 50,000 of fixed costs at a margin of 10 a unit takes 70,000 ÷ 10 = 7,000 units, or 175,000 of revenue at a price of 25.

### How does a price change affect the break-even point?

A small price change moves break-even a lot, because it changes the margin on every unit. With 50,000 of fixed costs and a variable cost of 15, raising the price from 25 to 27 lifts the margin from 10 to 12 and cuts break-even from 5,000 to 4,167 units; cutting the price to 23 raises it to 6,250 units.

### 「Break-even calculator」の精度はどのくらいですか？

精度は入力値と計算方法の前提に依存します。十進演算には有効数字50桁を使いますが、推定、数値計算手法、元データの精度はそれより低い場合があります。表示の丸め処理でこれらの制約がなくなるわけではありません。 独立した出典の解答と照合した計算例：4。 例えば、「Fixed 50,000, price 25, variable cost 15」はPython decimal: 50000 / (25 − 15) = 5000 units; 5000 × 25 = 125000と照合しています。

### この計算方法の出典は何ですか？

Corporate Finance Institute — Break-even analysis; Horngren, Datar & Rajan — Cost Accounting: A Managerial Emphasis, ch. 3 (cost-volume-profit analysis).

## 出典

- [Corporate Finance Institute — Break-even analysis](https://corporatefinanceinstitute.com/resources/accounting/break-even-analysis/)
- Horngren, Datar & Rajan — Cost Accounting: A Managerial Emphasis, ch. 3 (cost-volume-profit analysis)

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