Break-Even Calculator

Break-even analysis sits at the centre of cost-volume-profit (CVP) analysis — the framework managerial accountants use to answer questions like "how many units must we sell to stop losing money?" or "what revenue do we need to hit a Rs 200,000 profit?" The model assumes prices and unit costs stay constant inside the volume range you are looking at, then walks two equivalent formulas to the same answer.

1. The per-unit method

The classical formula divides fixed costs by the contribution margin per unit:

break-even units = fixed costs ÷ (price − variable cost per unit)

The denominator — the contribution margin per unit — is the part of every sale that actually goes toward recovering fixed costs. At a Rs 50 price with a Rs 30 variable cost, contribution is Rs 20: twenty rupees of every sale chips away at the rent. With Rs 10,000 of fixed costs in the period, the business needs 500 units to break even.

2. The revenue-ratio method (cross-check)

The same answer falls out of the contribution margin ratio — the contribution margin expressed as a fraction of revenue:

break-even revenue = fixed costs ÷ contribution margin ratio

With Rs 10,000 of fixed costs and a 40% contribution ratio, the business breaks even at Rs 25,000 of revenue — exactly 500 units at Rs 50 each. The calculator computes both numbers and lights a Verified badge when they agree to within floating-point tolerance, a low-cost guard against arithmetic typos when the numbers get large.

3. Adding a target profit

Break-even is the zero-profit case. To hit a positive profit target, add that target to fixed costs before dividing:

units for target = (fixed costs + target profit) ÷ contribution margin

A consultancy with Rs 50,000 of fixed costs that wants Rs 20,000 of profit at an Rs 80 contribution margin needs (50,000 + 20,000) ÷ 80 = 875 units. The same identity is used when planning bonus pools or owner draws — promote the target into the numerator and the formula tells you the volume.

4. Margin of safety

The margin of safety compares expected sales against break-even sales. A bakery forecasting 800 sales a month with a 500-unit break-even has a 300-unit cushion, or 37.5% of expected volume. AccountingTools describes this as the early-warning indicator of CVP: a thin margin of safety means a small dip in demand pushes the business into a loss, while a generous cushion absorbs shocks without paining the P&L.

5. Rounding rule for units

A fractional unit cannot be sold, so the calculator rounds break-even units up to the next whole number. If the math returns 16.67, the first whole sale that brings the business into the black is unit 17. Worked examples keep the exact 16.67 number visible so the textbook identity is auditable; the result tile shows 17 because that is the first sale that actually closes the gap.

• Investopedia — Break-Even Analysis (formulas and worked examples)
• Investopedia — Contribution Margin
• Corporate Finance Institute — Cost-Volume-Profit (CVP) Analysis
• AccountingTools — Break-Even Analysis
• AccountingTools — Margin of Safety
• US Small Business Administration — Calculate your startup costs (canonical break-even worksheet)

Formulas were last cross-checked on 2026-05-11. The page is reviewed annually and whenever an underlying source updates a standard CVP identity.