3 Free Calculators for Amazon Sellers: Know Your Numbers Before You Launch

The riskiest moment when preparing to sell on Amazon is when you skip checking the numbers, thinking, "This should be profitable enough." Once you factor in product costs, fees, logistics, and advertising, your estimated and actual profits can diverge significantly. That's why HIBOS has made three free calculators available on our homepage, allowing you to crunch three key numbers before you even start selling.

1. Net Profit Calculator — "How much do you really make per sale?"

Input your total product cost, packaging fees, other expenses, and logistics costs, along with FBA fees, storage fees, selling commission rate, selling price, and coupon discount rate, and you'll instantly see your net profit per unit and profit margin.

- If you're unsure about FBA fees, the auto-calculate option will fill in an estimated value based on your selling price. - Results are displayed in both USD and KRW (with an editable exchange rate). - Enter your target TACOS and target sales volume, and it will also calculate your monthly advertising budget and projected revenue.

2. Shipping Cost Calculator — Air vs. Sea: Compare the Numbers

Based on shipments from Korea to the US, enter your box dimensions (width, length, height), weight per unit, and number of boxes, and the calculator will:

- Calculate total actual weight, total volume (CBM), volumetric weight, and chargeable weight. - Compare estimated air freight and sea freight costs side-by-side, highlighting the more advantageous option. - Air freight uses the IATA standard volumetric weight (total volume ÷ 6,000), while sea freight applies a minimum 1 CBM standard. - Air freight (KRW/kg) and sea freight (KRW/CBM) rates are automatically updated with the latest standard values and can also be manually adjusted.

Since it provides the per-unit shipping cost, you can directly input this into the logistics cost field of the Net Profit Calculator for continuous calculation.

3. Break-Even Calculator — "How many days until you recoup your investment?"

Input your selling price, per-unit cost, shipping fees, FBA fees, product category (selling commission rate automatically applied), daily advertising spend, monthly fixed costs, initial investment, and daily sales volume, and you'll see all this on one screen:

- Per-unit contribution margin and profit margin. - How many units you need to sell daily to avoid losses (break-even sales volume). - The time it takes to recoup your investment and the cumulative advertising costs incurred during that period. - Daily, weekly, and monthly cumulative profit/loss graphs.

How to Use

All three calculators can be accessed directly from the top of the hibos-edu.com homepage. Members can use them for free with no usage limits, while non-members can preview the screen with example values. Calculation results can be saved as a single card using the Save as Image button, making them perfect for sharing with your team or community.

Before you launch your sales, make sure to check these three crucial numbers: your net profit per unit, shipping costs, and break-even point.