Free Business Tools for Freelancers and Small Businesses

Toolstik's free business tools cover the money side of freelancing and small business. There are four calculators for pricing (profit margin, markup, ROI, and discounts) and an Invoice Generator that turns your work into a downloadable PDF. Everything runs in your browser with no signup, and your numbers and client details stay on your device. This guide explains what each tool does, when to use it, and how they fit together, from quoting a job to checking whether it paid off.

The five business tools at a glance

You can also browse them all on the business tools category page.

Invoice Generator

The Invoice Generator builds a one-page PDF invoice from a simple form. You fill in an Invoice #, a Date, your details under From, and your client's under Bill to, each with an optional address. Then you add rows under Line items (description, quantity, unit price) with Add line item, and optionally set a Tax rate (%), a Discount ($), and Notes. A Live preview updates as you type. Generate PDF builds the file, and Download saves it as invoice-INV-001.pdf (or whatever your invoice number is).

The math is straightforward. The discount is a fixed dollar amount taken off the subtotal, and tax is applied to what's left. So 10 hours at $50 plus a $200 setup fee, with 10% tax, comes to a $700 subtotal, $70 tax, and a $770 total.

To be clear on limits: amounts are formatted in US dollars, and there's no logo upload, no separate due-date field, and no saved history. Put the due date and payment terms in Notes, and keep your own record of invoice numbers.

Guide: How to create an invoice for free covers what an invoice should include, how totals are calculated, and formatting tips. Tax and invoice requirements vary by country, and the guide isn't tax advice.

Profit Margin Calculator

The Profit Margin Calculator answers "how much of this sale do I keep?" On the Standard tab, enter Revenue and Cost and click Calculate to see Profit, Profit margin, and Markup. The Target margin tab works backwards: enter Cost and Target margin (%) to get the Required revenue, which is the price you need to charge.

Margin (%)        = (Revenue − Cost) ÷ Revenue × 100
Required revenue  = Cost ÷ (1 − Target margin ÷ 100)

Example: revenue $120, cost $80 gives profit $40, a 33.33% margin, and a 50% markup. If your job costs $1,200 to deliver and you want a 40% margin, quote $1,200 ÷ 0.60 = $2,000.

Copy puts the results on your clipboard, and Share copies a link with your revenue and cost already filled in. Only share that link with people who should see those numbers.

Guide: How to calculate profit margin includes a target-margin reference table and spreadsheet formulas.

Markup Calculator

The Markup Calculator is for pricing from cost. Its Cost + markup % tab takes Cost and Markup (%) and returns a Selling price. The Cost + selling price tab does the reverse and tells you what markup an existing price represents. Both show Profit, Markup, and Margin.

Selling price = Cost × (1 + Markup ÷ 100)

Example: a $40 cost with a 25% markup sells for $50, which is a 20% margin. For services, you can treat your loaded hourly cost as "cost." At $30 per hour with a 75% markup, you'd quote $52.50.

Guide: How to calculate markup has a markup-to-margin conversion table and the pricing mistakes to avoid.

Margin vs markup: the mistake that costs the most

Margin divides profit by the price. Markup divides profit by cost. They're never the same number, and confusing them is the easiest way to underprice. A 50% markup is only a 33.33% margin, and a 50% margin needs a 100% markup. If your business plan says "40% margin" and you add 40% to cost, you'll actually land at about 28.57%.

Guide: Profit margin vs markup puts the two side by side with conversion formulas, worked examples, and guidance on when to use each.

ROI Calculator

The ROI Calculator tells you whether money you spent paid off. Enter Amount invested and Amount returned, then click Calculate ROI to see ROI and Net profit.

ROI (%) = (Amount returned − Amount invested) ÷ Amount invested × 100

Example: $1,000 of ad spend that brought in $1,250 of profit is a 25% ROI. Common uses include comparing software subscriptions, equipment purchases, ad campaigns, or courses.

The calculator gives simple ROI, which ignores how long the money was tied up. To compare a one-year result with a three-year one, annualize both with (1 + ROI)^(1 ÷ years) − 1. A 30% return over 3 years is about 9.14% per year.

Guide: How to calculate ROI covers negative ROI, why you should use profit rather than revenue as the return, and spreadsheet formulas.

Discount Calculator

The Discount Calculator works out sale prices. Enter Original price, Discount (%), and optionally Extra discount (%) for a second stacked offer, then click Calculate to see Final price, You save, and Effective discount.

Stacked discounts multiply rather than add. 25% off and then an extra 10% off $80 gives $54, a 32.5% total discount, not 35%.

For sellers, the important check is what a discount does to your margin. An item that costs $30 and sells for $50 has a 40% margin. At 20% off it sells for $40, and the margin falls to 25%. Put the sale price back into the Profit Margin Calculator before you announce a promotion.

Guide: How to calculate a discount includes a stacked-discount table, how to find the original price from a sale price, and how fixed coupons change the result.

A simple workflow: from quote to "was it worth it?"

These tools are most useful together. Here's how a typical freelance project or product launch might use them:

1. Price it. Add up what the job or product costs you. If you have a margin goal, use the Target margin tab of the Profit Margin Calculator. If you price by adding a percentage to cost, use the Markup Calculator.
2. Plan any promotion. If you're offering an early-bird or bundle discount, check the final price in the Discount Calculator and confirm the margin still works.
3. Bill it. Create the invoice in the Invoice Generator, with payment terms and the due date in Notes.
4. Review it. Once the project or campaign is done, put the total spent and the total profit into the ROI Calculator to see whether it's worth repeating.

Other free tools freelancers use

Not everything in a freelance business is arithmetic. These tools from other Toolstik categories come up often when you're sending work and marketing yourself:

• PDF Compressor: shrink a contract, portfolio, or report PDF before emailing it alongside an invoice. See how to compress a PDF online.
• Merge PDF: combine an invoice, timesheet, and receipts into one file for the client. See how to merge PDF files.
• UTM Link Builder: tag the links in your newsletters and social posts so you can see which channel brings in clients. That data feeds directly into ROI. See how to build UTM links.
• Meta Title & Description Checker: check how your portfolio or service pages will look in search results.
• Word Counter: check word counts on proposals, bios, and writing jobs billed per word.

For the full picture, see the best free PDF tools, free SEO and text tools, or the Toolstik tools hub. If you bill for technical work, free developer tools covers formatters and decoders.

Privacy: your numbers stay on your device

All five business tools run in your browser. Calculator inputs, invoice line items, and client names and addresses aren't uploaded to a server or stored by Toolstik. The PDF invoice is built locally. There are two practical consequences:

• Nothing is saved between visits. Download your invoice PDFs and record your invoice numbers somewhere you control.
• Share links contain numbers. The Profit Margin Calculator's Share button puts revenue and cost into the URL. That's the only way any of your figures leave the page, and only if you send the link to someone.

What these tools are not

They're calculators and a document builder, not accounting software or professional advice. They don't track payments, reconcile bank accounts, file taxes, or handle multiple currencies. The examples in these guides are illustrations, not benchmarks. Good margins and returns vary widely by industry and business model. For tax, legal, or investment decisions, talk to a qualified professional.

All business guides

• How to create an invoice for free
• How to calculate profit margin
• How to calculate markup
• Profit margin vs markup
• How to calculate ROI
• How to calculate a discount

You can also browse every tool in the tools directory.