How to know if your idea is worth it
Most people walk past opportunities every day without noticing them. Entrepreneurs learn to look again. Watch the episode, then use the free business viability calculator below to pressure-test your idea against the three criteria — and find the one weak assumption you need to test first.
Vision to Venture — Episode 1
Validate before you build. Sell before you spend.
Hiding in plain sightOpportunities pass unnoticed. Entrepreneurs learn to look again.
The gap where founders get stuckAnalysis paralysis — obsessing over logos and domain names instead of demand.
The golden ruleValidate before you build. Sell before you spend.
The three criteriaA bleeding-neck problem, a reachable audience, and proven willingness to pay.
Run the gut-checkFind the weakest link — not a perfect score.
A viable idea usually meets three criteria
You cannot know with total certainty until you launch. But you can look for strong indicators that an idea has legs — and each weak indicator has a specific, cheap test attached to it.
It solves a bleeding-neck problem
Is your idea a vitamin — nice to have — or a painkiller — essential to relieve an immediate pain? People pay for painkillers. If your customer is actively complaining, or hacking together clumsy manual workarounds, you are on the right track.
If this is your weakest link → run The Mom Test.
The audience is reachable
It doesn't matter how great the idea is if it costs $500 in ads to acquire a customer who only pays you $50. You need a clear, realistic path to get in front of the people who have the problem.
If this is your weakest link → run a Painted Door test.
Willingness to pay exists
This is the ultimate test. Plenty of people will say "that's a great idea!" Very few will actually open their wallets. Enthusiasm is not revenue.
If this is your weakest link → run a Concierge MVP or a pre-sale.
Nice to have. Improves something already tolerable. Bought on a good month, cut on a bad one. Competes with everything else on the list.
Has to be solved. Costs money, time, or sleep every day it goes unsolved. Already has a clumsy workaround in place — which is your proof.
Gut-check the idea
Score each criterion honestly. The goal is not a perfect score — it is to find the single weakest link, so you know exactly which assumption to test first.
Three honest questions
0 – 10 eachBusiness viability calculator
The gut-check tells you whether the idea has legs. The business viability calculator tells you what it costs to find out — your revenue potential, your monthly overheads, and the start-up funds you actually need before you open the doors. Leave anything blank that doesn't apply.
Set-up costs $0
Equipment and assets
One-off costs
Monthly overheads $0
Annual potential revenue $0
Identify the single weakest link in your idea
Your homework
Perfection is not the goal here — momentum is. Take the weakest link the calculator surfaced and turn it into one small action you can finish this week.
- Write down, in one sentence, exactly who your customer is and what problem you solve for them.
- Name your weakest link out loud. It is the assumption everything else is resting on.
- Run the one test attached to it — before you spend another dollar or another month building.
Run the numbers on real equipment
You have just pressure-tested an idea in the abstract. The Wall Printer's ROI calculator does the same job against actual figures — jobs booked per month, price per job, material cost per square foot, and how fast the equipment pays for itself.
The Zero-Dollar First Steps
Testing demand and gathering authentic customer feedback without spending money: The Mom Test, the Painted Door test, and the Concierge MVP.
Breaking the Inertia
Overcoming the psychological barriers of starting. Shrink the timeline, the 15-minute rule, and embracing the ugly draft.
Questions people ask before they start
What is a business viability calculator?
A business viability calculator is a tool that estimates whether a business idea can cover its own costs and generate a profit before you commit real money to it. You enter your set-up costs, your monthly overheads, and your expected customer volume and pricing; it returns your potential annual revenue, your revenue potential after overheads, and the total start-up funds you need in reserve.
It is a screening tool, not a business plan. Its job is to tell you which of your assumptions is doing the most damage — so you can go test that one first.
How do I know if my business idea is worth pursuing?
Look for three indicators. First, the idea solves a bleeding-neck problem — something people are already complaining about or hacking together clumsy workarounds to fix. Second, the audience is reachable at a cost below what a customer is worth to you. Third, willingness to pay already exists — someone has opened their wallet, not just said "great idea."
You cannot know with total certainty until you launch. But an idea weak on any one of these three has a specific, cheap test attached to it, and running that test costs far less than building the wrong thing.
How much money do I need to start a business?
More than your set-up costs. The figure most first-time founders miss is reserve: the months of overheads you have to fund before the business covers its own running costs.
The calculation is your one-off set-up costs plus your monthly overheads multiplied by the number of months you expect it to take to break even. If you think it will take six months and your overheads are $2,500, that is $15,000 of reserve on top of everything you spend getting the doors open.
What is the difference between a "vitamin" and a "painkiller" idea?
A vitamin improves something that is already tolerable. It gets bought in a good month and cut in a bad one, and it competes with everything else on the customer's list.
A painkiller solves something that costs money, time, or sleep every day it goes unsolved. The clearest proof you have a painkiller is that your customer has already built a clumsy workaround — a spreadsheet, a manual process, a workaround they are embarrassed by. People reliably pay for painkillers.
How do I validate a business idea for free?
Three methods, all zero-dollar. The Mom Test: talk to ten potential customers without pitching — ask how they handle the problem today and whether they have ever paid to fix it. The Painted Door test: put up a free one-page site with a single clear button and drive organic traffic to it; clicks are real interest. The Concierge MVP: deliver the service manually for one paying customer before you automate anything.
Which one you run depends on which of the three criteria came out weakest above. That is the whole point of finding your weakest link.
Where these ideas come from
Validation, early testing, and building alongside customers come from a movement that reshaped how modern companies are built — the Lean Startup and Customer Development methodologies.
Where the rule "don't ask if your idea is good" comes from. People — especially friends and family — will lie to spare your feelings. A framework for asking about past behavior instead of future intentions.
Popularized building the smallest, cheapest version of a product to test your assumptions in the real market. Replacing guesses with validated learning.
The godfather of the movement, and Eric Ries's professor. Startups don't fail because they fail to build a product — they fail because they build a product nobody wants.
A literal playbook: 44 specific, low-cost experiments — including the Painted Door test and other smoke tests — to check whether an idea is desirable, viable, and feasible. Run these before you spend real money.