How Much Should You Budget for Facebook Ads Each Month?

The short version: most small businesses need somewhere between £500 and £2,000 a month to get useful data from Facebook ads, and less than that isn't wasted, it's just not enough to learn anything. The real number depends on your cost per result, not on a round figure you saw in a Facebook group. Work backwards from what a customer is worth to you, not forwards from what feels affordable.

Why "how much should I spend" is the wrong first question

Every week someone asks me this on a call, usually straight after "is Facebook still worth it in 2026". They want a number. £300? £1,000? £5,000? I understand why. Budgeting for anything feels safer with a fixed figure attached to it. But Facebook ads don't work like a fixed subscription. The right monthly spend depends on three things: what you're selling, what a customer is worth, and how much data the algorithm needs before it stops guessing.

If you're brand new to this whole thing, it's worth reading my beginner's guide to how Facebook ads work before you set any budget at all, because most of the "my ads don't work" stories I hear are really "I didn't understand what I was buying" stories.

The number Facebook itself is quietly telling you to hit

Meta's own algorithm needs roughly 50 conversions per ad set within a week to exit what it calls the "learning phase". Before that, it's guessing who to show your ad to. After that, it starts optimising. This is not marketing folklore, it's in Meta's own advertiser documentation, and it's the single most useful number for working out your budget.

Here's the maths. If your cost per result (a lead, a sale, a booking, whatever your goal is) is £20, and you need 50 of those in a week for the algorithm to learn, that's £1,000 a week for a single ad set. Multiply by roughly 4.3 weeks and you get around £4,300 a month, just for one ad set to be given a fair shot.

Most small businesses read that and close the tab. Understandable. So here's the practical version most people run with:

• If your cost per result is £5 to £15 (common for local services, low ticket products, and simple lead forms), a budget of £600 to £1,200 a month gets you close to a full learning cycle on one or two ad sets.
• If your cost per result is £20 to £50 (typical for B2B leads, higher ticket products, or competitive niches like finance or property), you're realistically looking at £1,500 to £3,000 a month to get proper data.
• If you don't know your cost per result yet because you've never run ads before, budget £750 to £1,000 for your first month purely as a discovery spend, and treat it as tuition, not as a campaign you're judging on ROI.

A quick formula you can use today

Monthly test budget = (cost per result you expect) x 50 x (number of ad sets you're testing) x 0.85

The 0.85 is a fudge factor, because in practice you rarely need the full 50 conversions to know whether something is working or dying. It's a starting point for planning, not a rule carved into anything.

A real example: the boutique gym that nearly gave up after month one

A few years ago I worked with a small independent gym near Tunbridge Wells. Owner, one employee, decent local following, no ads experience. She'd been told by a well meaning friend to "just put £10 a day into Facebook ads" and see what happens. She did that for three weeks, split across five different ad sets because she wanted to test five different offers at once. Total spend: about £210. Result: nine leads, three trial sign ups, zero paying members, and a firm belief that "Facebook ads don't work for gyms".

The problem wasn't the platform. It was that £10 a day split five ways meant each ad set got about £2 a day. Facebook couldn't learn anything from that. We consolidated down to one offer, one ad set, £25 a day for a month, which is £750 total. By day 19 the cost per trial had dropped from £23 to £11, because the algorithm had finally seen enough conversions to work out who to target. Same business, same offer, same creative in month two, four times better results, purely because the budget was concentrated instead of scattered.

That's the pattern I see over and over. It's not that people spend too little overall. It's that they spread too little across too many things and never let any single test finish.

The uncomfortable bit nobody likes putting in these guides

Here's the part that tends to get skipped over: a bigger budget does not fix a bad offer. It just helps you find out faster that your offer is bad. I've watched businesses double their Facebook budget from £1,000 to £2,000 a month expecting double the customers, and instead they got the same conversion rate applied to twice as many people who weren't interested. More spend on a weak hook, a confusing landing page, or a price nobody wants to pay just means you lose money more efficiently.

Before you increase budget, fix the creative and the offer. That's usually the cheaper problem to solve. My breakdown of what good Facebook ads look like is worth ten minutes before you touch your budget slider again, and if your creative is the weak link specifically, my guide to building Facebook ad creatives that convert will save you more money than any amount of extra spend will.

What changes the number for your business

Your average order value or customer value

A business selling a £39 candle subscription and a business selling £4,000 kitchen renovations can't use the same budget logic. The candle business might tolerate a £15 cost per sale. The kitchen business can tolerate a £150 cost per lead because one sale covers twenty months of ad spend. Work out your customer lifetime value first, then decide what you can afford to pay to acquire someone.

Your industry

Legal, finance, insurance, and home services tend to have the highest cost per click and cost per lead on Facebook, often £2 to £6 per click before you even get a conversion. Ecommerce fashion and lifestyle products often sit at £0.50 to £1.50 per click. If you're in a competitive, high value niche, budget for that reality rather than benchmarking against a friend selling t-shirts.

Whether you're running ads or paying someone to run them

Your monthly Facebook budget and your management fee are two completely separate numbers, and I still see business owners conflate them. If you're paying a freelancer or agency £500 a month to manage your ads, that £500 is on top of your ad spend, not part of it. My guide on what to charge (or expect to pay) for small business marketing services lays out realistic fee ranges so you're not caught out by a quote that quietly bundles ad spend into the "management" figure.

Where you're showing up

Facebook, Instagram, Messenger, and Audience Network all pull from the same budget but perform very differently. I've seen accounts where 80% of spend went to Audience Network placements nobody ever saw, quietly draining the budget with almost no return. My piece on where to place Facebook ads for the best results covers which placements are worth your money and which ones you should switch off in the settings.

How to set your first month's budget, step by step

• Step 1: Work out your average customer value. If you don't know it, use your average order value as a rough stand in.
• Step 2: Decide the maximum you'd happily pay to acquire one customer or lead. As a rough rule, aim for no more than 20 to 30% of customer value on acquisition if you want profit left over.
• Step 3: Multiply that acquisition cost by 50, then by however many distinct audiences or offers you need to test (keep this to one or two in month one, not five).
• Step 4: If the number that comes out is bigger than you can afford, don't spread it thinner. Cut the number of ad sets, not the budget per ad set.
• Step 5: Commit to that number for a full 3 to 4 weeks before judging results. Facebook's algorithm needs time, and pulling a campaign at day 6 because "nothing's happened yet" is one of the most common ways small budgets get wasted.

When to increase your budget, and when to walk away

Increase spend when you've got a cost per result you're happy with and it's stable across at least 100 to 150 conversions, not five. That's a real signal, not luck. A sensible increase is 20 to 30% every few days, because Facebook resets learning if you jump too fast (going from £30 a day to £100 a day overnight often triggers a fresh, worse learning phase).

Walk away, or at least pause and rebuild, if after a full month at a sensible budget your cost per result is still more than double what you can afford to pay. At that point the problem almost certainly isn't the budget. It's the offer, the audience, or the creative, and no amount of extra money fixes those.

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Frequently asked questions

What is the minimum monthly budget for Facebook ads?

Facebook will technically let you run ads from as little as £1 a day, but a workable minimum for learning something is around £15 to £25 a day per ad set, roughly £450 to £750 a month for a single, focused test.

How much should a small business spend on Facebook ads per month?

Most small businesses need £500 to £2,000 a month to get a proper read on performance, depending on cost per result and how many offers or audiences they're testing at once. Start at the lower end with one offer rather than spreading across several.

Is £10 a day enough to run Facebook ads?

It can work for very low cost per result products in a single ad set, but £10 a day split across multiple ad sets, as many beginners do, almost always fails to reach the volume the algorithm needs to optimise.

How much do Facebook ads cost per lead in the UK?

It varies widely by industry, roughly £5 to £15 for simple local services, £20 to £50 for competitive B2B or high value sectors like finance and property, and higher again in the most contested niches.

Primary sources

• Meta's Business Help Centre