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FREE TOOLS FOR ONLINE SELLERS

Know your profit
before you sell.

Fees add up. Shipping eats into margins. See what you actually keep, find your price, and plan your next promotion.

Calculate my profit ↓
01 · KNOW YOUR COSTS

See the full picture

Combine product cost, packaging, shipping, advertising and payment fees.

02 · PRICE WITH CONFIDENCE

Make the numbers work

Find a target price and check how a discount affects what you keep.

03 · GET READY TO SELL

Prepare your listing

Set a sales target and resize your product photos without uploading them.

Your product

Saved on this device

Percentage fees apply to the selling price. Use seller-paid shipping net of any shipping collected. Taxes, returns and overhead are excluded unless entered. Currency changes the display only.

Profit per order

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Your seller toolkit

Profit Margin CalculatorSee what you keep after product costs, fees, packaging, shipping and ads.Markup & Target Price CalculatorFind a selling price from markup or a target profit margin, including fees.Discount CalculatorCompare your profit before and after a promotion, before you launch it.Break-even CalculatorTurn monthly fixed costs into a clear sales target for your product.Product Image ResizerResize and compress product photos on your device. Download JPG, PNG or WebP.

More sales should mean more profit

A product that sells for $30 does not leave $20 profit just because it costs $10 to buy. Packaging, shipping, marketplace commissions, payment processing and advertising all reduce what you keep. SellerKit puts those costs in one place so you can make pricing decisions with the same assumptions across every calculator.

One product, connected decisions

Start with your costs above, then open the target price calculator to choose a margin. Before launching a sale, use the discount calculator to compare your contribution before and after the promotion. The break-even calculator turns that contribution into the number of orders needed to cover fixed expenses.

Your numbers stay in your browser

Your current product is saved on this device, so it follows you between the pricing tools. No account is required. Photos are resized locally and never uploaded by our tools. These calculations are estimates from the inputs you enter, rather than an accounting statement or a guarantee of future earnings.