Online Store Startup Calculator

Estimate online store startup economics using launch cost, annual margin, growth, fees, tax drag, and downside scenario.

Online store startup calculator

Estimate Korean online-store profit by platform, business model, tax type, initial investment, daily orders, average order value, refund rate, platform fee, PG fee, VAT, income tax, and health insurance.

Initial investment

₩4,500,000

Monthly net revenue

₩10,185,000

Monthly net profit

₩2,637,739

Profit rate

25.9%

ROI months

2

Grade

A

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Uses calcAll with Korean online-store platform commissions, PG fees, refund rate, shipping and packaging cost, simple/general VAT, income tax, health insurance, platform comparison, and worst/base/best BEP simulation. This English finance calculator calls the same Korean pure calculation module as the Korean page. KRW amounts, Korean thresholds, insurance rules, tax logic, and scenario assumptions are preserved instead of the old generic percentage stub.

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Online store startup guide

This English guide translates the Korean online store startup calculator. The calculator calls calcAll and keeps Korean platform fees, taxes, fulfillment costs, and scenario simulation.

Platform and business model

The Korean model compares Naver Smart Store, Coupang, 11st, Gmarket, Kakao, and self-hosted mall assumptions. Each platform can have different commission and PG fee.

Business model presets include purchase, dropshipping, overseas, handmade, wholesale, and digital models. They change initial stock, daily orders, average order amount, refund rate, cost rate, shipping, packaging, and marketing assumptions.

Monthly profit after tax

Monthly revenue can be calculated from daily orders and average order amount or entered directly. Refund rate reduces gross revenue before cost and fee calculations.

The engine estimates cost of goods, platform commission, PG fee, operating costs, VAT, income tax, local income tax, and health insurance. The result reports net profit and profit rate, not just sales.

BEP and scenarios

The simulator returns worst, base, and best scenarios with cumulative profit and BEP month. It also calculates ROI months and a grade from S to F.

Platform comparison shows whether lower fees on another platform would improve net profit under the same sales and cost assumptions.