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Side Hustle Profit Calculator

A side hustle that brings in $800 a month can easily leave you with less than half of that once platform fees, materials, software and taxes are paid. Hours matter too: earning $300 in profit from 40 hours of work is a very different deal from earning it in 10. This calculator turns your monthly numbers into the two figures that matter: profit after a tax set-aside, and your real hourly rate.

Why revenue is the wrong number

Marketplaces and payment processors show you sales, because sales look encouraging. But every sale carries costs before it becomes yours. Marketplaces typically charge a listing or transaction fee, payment processors take a percentage plus a fixed amount per transaction, and physical products have materials and shipping. Check the current fee page of the platform you use and enter its actual rates; fee structures differ widely and change over time.

The fixed fee per order is easy to overlook and matters a lot for cheap products. A $0.30 fee on a $3 digital download is 10% of the price before any percentage fee is applied.

The tax set-aside

In many countries, side-hustle profit is taxable income, and because no employer withholds tax for you, the bill arrives later in one piece. Setting aside a percentage of profit every month avoids that surprise. The right percentage depends on your country, total income and local rules; in the United States, for example, self-employment tax applies on top of income tax, which is why freelancers often set aside a larger share than employees expect. The default 25% here is a placeholder, not advice. Check your national tax authority's guidance (the IRS self-employed tax center in the U.S., HMRC in the UK, the SAT in Mexico, the National Tax Agency in Japan) or a tax professional, then enter your own figure.

Keep the set-aside in a separate savings account. Our freelancer tax set-aside guide explains how to do it payment by payment.

Your real hourly rate

Divide take-home profit by every hour spent: making, listing, answering messages, packing, editing, learning the platform and doing the books. Most people only count production time, which flatters the result. Track your hours honestly for a month and enter the total. Then compare the real hourly rate with two benchmarks:

• What you earn per hour at your main job after tax.
• What you could earn from overtime or an extra shift.

A side hustle earning less per hour than these can still be worthwhile if it builds a skill, an audience or an asset that will pay later. But it should be a conscious choice, not an accident hidden by a high revenue figure.

Five ways to improve the numbers

1. Raise prices. A 15% price increase on a product with a 30% margin raises profit by half, if volume holds. Test on new listings first.
2. Bundle. Larger orders spread fixed per-order fees and packing time over more revenue.
3. Cut low-earning work. Look at which products or clients bring the least profit per hour and drop or reprice them.
4. Batch tasks. Doing all listing, packing or editing in one block reduces switching time.
5. Review subscriptions. Software and ad spend creep up. Every tool should earn back its cost each month.

Tracking a side hustle in a spreadsheet

Use one row per sale or payout with: date, platform, gross amount, fees, net received, and a category. A second tab lists expenses with the date, vendor, category and amount, and a third logs hours. A monthly summary built with SUMIFS then gives revenue, fees, costs, profit and hourly rate for each month. Our side hustle income tracker guide walks through the setup, and the freelance hourly rate calculator helps you price client work.

Choosing a side hustle

If you are still deciding what to start, our niche reports look at print-on-demand, low-content publishing, stock photos and niche affiliate sites, including the realistic costs and time involved before the first sale.

How to fill in each field

• Monthly sales: total gross sales for a typical month, before any fees. If sales are seasonal, run the calculator for a slow month and a busy month.
• Platform and payment fees %: add together the percentage fees you pay per sale, for example a marketplace transaction fee plus a payment processing fee. Use the rates on your platform's current fee page.
• Fixed fee per order: any flat amount charged per transaction or listing.
• Materials: physical inputs and shipping supplies used for the month's orders.
• Software, ads, subscriptions: monthly tools, design assets, advertising and any equipment cost spread over its useful life.
• Hours: every hour spent on the hustle, including admin.
• Tax set-aside %: your own estimate, based on official guidance or professional advice.

Reading the result

Margin tells you how much of each sale you keep, and it is the best number for comparing products. The hourly rate tells you whether the work is worth your time. A product with a high margin but a low hourly rate is usually a pricing or efficiency problem; one with a low margin and a high hourly rate may be fine to keep as long as volume holds. Track both for a few months before making big decisions, because one month of data can be misleading.

FAQ

How do I calculate side hustle profit?

Subtract platform and payment fees, materials and other costs from revenue. Then subtract the share you set aside for tax. Divide what remains by your hours for a real hourly rate.

How much should I set aside for taxes on side income?

It depends on your country and total income. Check your tax authority or a professional. Many self-employed people in the U.S. set aside a larger share because self-employment tax applies too.

What hours should I count?

All of them: production, listing, customer messages, shipping, admin and learning. Counting only production time overstates your hourly rate.

Is a low hourly rate always bad?

Not always. Early on you may be building skills or an audience. But compare it with your other options so it is a deliberate choice.

Is my data saved?

No. The calculator runs in your browser only.

For general education and planning only. Not financial, tax or legal advice. Check important decisions with a qualified professional.