See your web design business's real monthly profit — project fees, retainer income, tools, overhead, and marketing spend all on one screen.
Your last invoice amount is not your monthly profit — not once tools, software, subcontractors, and slow months average out. This calculator takes your real operating numbers — Projects Per Month, Average Project Value, Retainer Clients, their Monthly Retainer Fee, plus Tools and Software costs, Overhead, and Marketing Spend — and returns gross revenue, total cost, and net profit clearly.
It is designed for the decision points that matter: whether to raise project rates, how many retainer clients you need to replace project income volatility, or whether a new hosting or design software subscription actually fits your margin.
How project fees and retainer income work differently
Project revenue is lumpy. Four projects at $3,500 average one month can drop to two the next, and your fixed costs do not care. The calculator handles both streams separately: Projects Per Month times Average Project Value gives your project gross, and Retainer Clients times Average Monthly Retainer Fee gives your predictable floor. Together they show your total monthly gross.
The retainer floor is the number worth growing deliberately. A web designer with eight retainer clients at $800 per month has $6,400 in predictable monthly gross before a single project closes. That changes how you price project work, how many leads you need, and whether you can afford to pass on a bad-fit client.
The real cost stack web designers undercount
The three cost fields — Tools and Software, Monthly Overhead, and Marketing Spend — cover costs that designers routinely undercount. Tools and software alone can reach $400–900/month when you tally Figma, Adobe CC, web hosting for client sites, project management, invoicing software, stock assets, and email marketing. Enter the real number, not a rough estimate.
Marketing Spend surprises many solo designers because they think of it as optional. But referrals slow down. SEO, portfolio ads, directories, and outreach all cost something, even if it is just your time priced at your hourly rate. Keeping a real marketing spend number in the model means your net profit does not get inflated by pretending acquisition is free.
Monthly Overhead covers the operating basics: business banking fees, professional liability insurance, accountant costs, co-working space or home-office proration. None of these are dramatic line items, but at $300–600/month combined they subtract from a margin that is already thinner than it looks.
What a healthy web design margin looks like
Solo web designers running a clean operation typically net 45–65% of gross once all tools, overhead, and marketing are in. If your result is below 35%, either your rates are underpriced relative to your costs, or the tools and software bill has crept higher than you realized. If it is above 70%, double-check that your own salary or hourly cost is accounted for somewhere.
The margin conversation becomes most useful when you model a rate increase. Raise Average Project Value by $500 and watch how much net profit changes. Then ask yourself: would I actually lose clients at that rate? How many can I afford to lose before the higher rate stops being worth it? Those questions have answers once you can see the numbers.
Retainer clients as the path to a stable income floor
A single retainer client at $1,000 per month — covering site maintenance, copy updates, and monthly reporting — offsets the revenue gap of losing a $3,000–4,000 project. Five such clients create a $5,000 baseline that covers tools, overhead, and basic living before a single new project closes.
The tool lets you model the shift from a purely project-based studio toward a retainer-heavy one. Add retainer clients one at a time, keep project count conservative, and watch your net profit stabilize month over month. The math usually reveals that even three retainers priced at $600–800 fundamentally change the risk profile of the business.
Knowing your rate floor before every proposal
Once you have your monthly cost total from this tool, you know the minimum gross you must hit each month. Divide that by your realistic project count and you have the floor below which a project quote does not make business sense — not as a gut feeling, but as a real number.
Use that floor before every proposal. A $2,800 project quote that feels generous suddenly looks different when your monthly cost floor is $4,500 and that project is one of only two closing this month. Knowing your economics does not mean turning down work — it means knowing exactly what you are trading when you price low to win.
Designers who price with data stop discounting reflexively and keep more margin without losing clients. Run this model monthly — it stops being a planning exercise and starts being a pricing compass. Free to start, no card required.
How to use it
- Enter Projects Per Month as your realistic average over the last six months, not your best month.
- Set Average Project Value to your typical project invoice — new sites, redesigns, or custom builds combined.
- Enter Retainer Clients and Avg Monthly Retainer Fee to capture your predictable monthly income.
- Fill in Tools and Software ($/mo) with every subscription you pay to run client work.
- Enter Monthly Overhead and Marketing Spend ($/mo) as real monthly numbers, not zero.
- Read gross revenue, total costs, and net profit — then change project value or retainer count to test a scenario.
Who it's for
- Solo designer considering a rate increase — Runs the model at current $2,800 average project and at $3,500 to see that even losing one project per month at the higher rate still nets $800 more monthly.
- Designer replacing one project per month with a retainer client — Models three retainers at $750/month versus inconsistent project income and finds the retainer model adds $400 more net with 60% less stress.
- Small agency pricing a junior hire — Adds $2,400/month to overhead for a part-time contractor, then increases Projects Per Month by two to check whether the hire pays for itself.
- Designer evaluating an expensive new design platform — Adds $180/month to Tools and Software to see the net profit impact, then asks how many extra hours it saves per project to determine if it pays.
- Freelancer preparing for a quiet quarter — Drops Projects Per Month to two, holds retainer income steady, and finds the retainer floor covers all fixed costs even in a slow month.
Key terms
- Average project value
- The mean fee across all closed projects in a given period. This is the most direct lever in a web design business — a consistent 15% rate increase typically adds more net profit than doubling leads.
- Retainer income
- Predictable monthly revenue from clients who pay a fixed fee for ongoing services — maintenance, updates, SEO reports, or strategy. The base that makes project income feel less precarious.
- Tools and software cost
- Every subscription, license, or recurring purchase needed to deliver client work — design tools, hosting, fonts, project management, and billing. Often underestimated when added monthly.
- Gross revenue
- Total income before any costs — project fees plus retainer fees in this model. Not profit; the number your bank account sees before costs start.
Frequently asked questions
How should I count projects — by invoice date or project close?
Use the month the project invoice is sent or the milestone payment clears, not when you started the work. The goal is a cash-flow model, so timing it to when money actually arrives gives you the most useful net profit picture.
What is a reasonable monthly retainer rate for a web designer?
Maintenance and content retainers typically run $500–1,500/month depending on update frequency and complexity. Strategy and growth retainers for clients who want monthly reporting, A/B testing, and ongoing copy can reach $2,000–4,000. Set the rate in the tool to whatever your actual or target retainer value is.
Should I include subcontractor costs in overhead or tools?
Neither — subcontractors are a variable cost tied to specific projects. The most accurate approach is to subtract their fees from the Average Project Value before entering it, so your revenue number reflects what you actually keep after pass-through costs.
My income is wildly inconsistent month to month. Is this tool still useful?
Yes. Use a three-month or six-month average for Projects Per Month and Average Project Value to get a representative baseline. Then run a conservative scenario with lower numbers to find your cost floor. Knowing the floor is more useful than modeling a perfect average month.
What net margin should a solo web designer be hitting?
In the 45–65% range is healthy for a solo operator with standard tools costs and moderate marketing spend. Below 35% typically means rates need to move. Above 70% is possible but usually means costs are understated — check that all software subscriptions and your own paid time are included.