Percentage Calculations Every Business Owner Should Know

Percentages appear in almost every business decision. They show discounts, tax rates, profit margins, conversion rates, refunds, growth, churn, and price changes. The calculation is simple, but mistakes can directly affect revenue.

Percentage of a Number

This is the calculation behind discounts and fees. If a product costs $80 and the discount is 15%, the discount is 0.15 x 80 = $12. The customer pays $68 before tax or shipping.

Percentage Change

Percentage change compares a new value with an old value. If monthly sales grow from $20,000 to $25,000, the change is ($25,000 - $20,000) / $20,000 x 100 = 25%. This is useful for tracking revenue growth, traffic growth, and cost increases.

Margin vs Markup

Margin and markup are not the same. Markup is based on cost. Margin is based on selling price. A product bought for $60 and sold for $100 has a $40 profit, a 66.7% markup, and a 40% margin.

Best Practice

• Label whether the percentage is based on cost, price, or original value.
• Keep raw numbers next to percentage changes.
• Do not average percentages from different base sizes without weighting them.
• Use decimal precision for finance and rounded values for quick summaries.

Calculate It Yourself

Use the Percentage Calculator for quick percentage math. For business decisions, also try the Profit Margin Calculator, Markup Percentage Calculator, and Discount Calculator.