利益ちゃん app for iPhone and iPad

Rieki-chan – Profit Calculator for Sellers

Have you ever struggled to figure out the right price to charge in a flea market, a personal sale, or freelance work?
Worried about how shipping costs or platform fees affect your actual profit?

Rieki-chan is a simple, powerful tool that helps you calculate sales prices, profit amounts, and profit margins — all based on your desired outcome.

Just enter your basic costs (product price, shipping, fees), and you’re ready to go.


**Calculate from Profit Margin**
Want to set a 20% margin on your cost price? It’s usually calculated like: Cost ÷ (100 - Margin) × 100…
But wait — do you include shipping and fees too? With Rieki-chan, just select the “From Margin” tab and input your desired percentage. The app calculates everything for you instantly.

**Calculate from Profit Amount**
Not interested in percentages? You just want a fixed 3,000 yen profit?
No problem. Choose the “From Profit” tab, enter your desired profit, and Rieki-chan instantly shows the ideal sales price.

**Calculate from Selling Price**
Have a fixed selling price in mind?
Select the “From Price” tab and enter your target. You’ll immediately see how much profit you’ll make and what the margin is.


All three methods are just a tab away. Easily compare options and tweak numbers until they make sense.

You can clear all values with a single tap, and there’s even a smart feature to keep your fee settings when resetting.

Calculations may result in slight rounding errors. Please use results as a reference only.

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