I just realized that many people don't truly understand the concept of costs in business. We often hear about fixed costs and variable costs, but the difference is very important for financial planning.

Let's start with fixed costs. These are expenses that do not change regardless of whether the business sells more or less. Imagine you rent an office; the rent must be paid every month whether you have customers or not. Salaries, insurance, loan interest—all of these are fixed costs that must be paid continuously.

What makes fixed costs important is that they affect pricing decisions. If you know how much you need to pay for rent each month, you must set your product prices high enough to cover that. This is part of the total cost, which is the sum of all expenses combined.

In contrast, variable costs change according to the production volume. The more you sell, the higher the raw material costs. Direct labor, packaging, transportation—all of these increase or decrease depending on sales volume.

What’s interesting is that once you understand both types, you can calculate the total cost, which is the sum of fixed costs plus variable costs. This way, you will know how much you need to sell to break even.

For example, if fixed costs like rent and other expenses total 100,000 baht per month, and the variable cost per unit is 50 baht, the total cost is the sum of these expenses. If you sell 1,000 units, the total cost will be 100,000 plus 50,000, totaling 150,000 baht.

Understanding this helps businesses make better decisions, such as investing in machinery to reduce variable costs or negotiating with property owners to lower fixed costs. Analyzing total costs is a key to good financial planning.

For those running a business or just starting out, try grabbing a piece of paper and calculating your fixed and variable costs. Once you know, you can plan profits and growth more wisely.