Design ROI Calculator — What a SaaS Redesign Is Worth

"Design" sounds like a cost until you put a number on it. This calculator turns your funnel into one: enter your traffic, conversion rates, and pricing, and it shows the added revenue, new MRR, payback period, and first-year ROI a conversion-lifting redesign delivers. The math is deliberately conservative — it decays customers by your churn and only counts year-one revenue — so the number you get is one you can actually take to a co-founder or a board. Free, no signup, runs right here.
Design ROI Calculator
What a redesign is worth
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How it works

‍Seven inputs, all things you already know: monthly visitors, signup/trial rate, trial-to-paid rate, revenue per customer, customer lifetime, an expected conversion lift, and your design budget. From those it models the extra customers a lift wins you each month, ages them out at your churn rate, and totals the revenue over the first twelve months. Every field has a tooltip if you're not sure what to put.

What you get

‍A clear read on the money: added revenue in year one, extra signups and paying customers per month, new MRR added, how many months until the project pays for itself, and your first-year ROI as a simple multiple. Green means a strong return, red means the numbers don't back the spend yet — no spin either way.

Why it's conservative on purpose

‍Most ROI calculators inflate the number by ignoring churn and counting a customer's entire lifetime value on day one. This one doesn't. It decays each monthly cohort by the churn your lifetime implies and stops counting at twelve months, so a healthy result is a genuinely healthy result — not a vanity figure that falls apart under scrutiny.

FAQ

How do you calculate design ROI?

‍The tool applies your expected conversion lift to your funnel to find the extra paying customers a redesign wins each month, decays those cohorts by the churn your customer lifetime implies, and totals the revenue over the first twelve months. ROI is that year-one revenue divided by your design investment.

What conversion lift should I expect from a redesign?

‍It varies, but a realistic range is 10–20%. The calculator defaults to a conservative 15% so the result isn't overstated — adjust it to match your own expectations or past tests.

Is this only for SaaS?

‍It's built around the SaaS funnel (trials, MRR, customer lifetime), but sales-led teams can use their demo-to-close rate in the trial-to-paid field. Anyone with a signup or lead funnel can get a directional number.

Why is the number lower than other ROI calculators?

‍Because most of them ignore churn and count a customer's full lifetime value up front. This one decays customers over time and only counts year-one revenue, so the result is defensible rather than inflated.

Is it free? Do I need to sign up?

‍Completely free, no email and no signup. It runs entirely in your browser.