Most "ad budgets" are a number someone made up in a meeting. This one isn't. Pick the outcome you want (X leads a month, or $Y in revenue), tell us your average order value and how often you close, and the ad budget calculator works backward to the monthly spend it takes to get there. It shows the math at every step, so you leave understanding the number, not just staring at it.
Use the calculator above. Set your goal, pick a channel, override the benchmarks with your own numbers if you have them, and toggle management fee on or off. Free. No signup. No email wall.
How much should I spend on advertising to hit my lead or revenue goal?
Work backward from the outcome. The formula is: monthly budget = (goal conversions ÷ close rate) ÷ landing-page conversion rate × cost per click. Decide how many sales or leads you need, divide by your close rate to get required leads, divide by your landing-page conversion rate to get required clicks, then multiply by your channel's average cost per click. That click math is your media budget. Add a management fee on top if an agency runs it.
What this ad budget calculator does
It solves for spend, not the other way around. You give it a destination; it tells you the fare.
Here is the chain it runs, in order:
- You set the goal. Either a number of new customers per month, or a revenue target. If you enter revenue, the tool divides by your average order value to get the number of customers you need.
- It backs into required leads. Goal customers ÷ your close rate (the percentage of leads that turn into paying customers). Close 1 in 5? That's a 20% close rate, and you need 5 leads per sale.
- It backs into required clicks. Required leads ÷ your landing-page conversion rate (the percentage of clicks that become leads). A 5% landing page means it takes 20 clicks to produce one lead.
- It backs into required impressions. Required clicks ÷ the channel's click-through rate, so you can sanity-check whether the audience is even big enough to deliver. If the impressions you need outstrip the audience that exists, no budget fixes that; you need a wider channel or a different goal.
- It backs into budget. Required clicks × the channel's average cost per click. That's your monthly media spend.
- It adds the management fee, if you want it. Flip the toggle and the tool layers in our transparent, tiered management fee (the same logic published on our Google Ads pricing page), so the number you see is the real all-in monthly cost, not the media-only sticker price.
Every field is pre-filled with a sourced benchmark and fully editable. If you know your own CPC and conversion rate, type them in and the math reruns instantly. If you don't, the defaults give you a defensible starting estimate instead of a coin flip.
The math, in plain English
No black box. Here's the whole thing on one line:
Monthly budget = ( ( goal conversions ÷ close rate ) ÷ landing-page conversion rate ) × cost per click
A worked example, using round numbers:
- You want 10 new customers a month.
- You close 25% of your leads. So you need 40 leads (10 ÷ 0.25).
- Your landing page converts 5% of clicks into leads. So you need 800 clicks (40 ÷ 0.05).
- Your channel's average CPC is $5. So your media budget is $4,000/month (800 × $5).
Change any input and the answer moves. Better landing page? Fewer clicks, smaller budget. Cheaper channel? Same. Higher close rate? Same again. That's the point: this tool shows you which levers shrink the spend, instead of leaving you to guess whether the problem is the budget or the funnel.
Which lever to pull first
The four inputs do not have equal weight, and they are not equally in your control. Worth knowing before you start dragging sliders.
- Landing-page conversion rate is the biggest lever and the one you own. In the example above, lifting the page from 5% to 10% cuts required clicks from 800 to 400 and halves the budget to $2,000, with no change to the ad itself. You can't negotiate the auction down by 50%, but you can frequently double a page's conversion rate with sharper copy, faster load, and one clear call to action. That's why our conversion optimization work tends to return more than chasing cheaper clicks does.
- Close rate is the second lever, and it lives in sales, not ads. A 25% close versus a 20% close is the difference between needing 40 leads and 50. The ad budget feels the gap even though the fix is in how you handle the leads you already pay for.
- CPC is mostly set by the market. You can tighten targeting, match types, and quality score, but you're working at the margins, not rewriting the auction. Most of the savings hides in reducing wasted spend on clicks that were never going to convert, not in winning the click war.
- Goal volume is yours to set, but the math will push back. If the budget comes back triple what you can afford, the tool is telling you the goal and the funnel don't agree yet. Trim the goal or fix the funnel; don't just lower the budget and hope.
Run the calculator twice: once with today's numbers, once with a realistic landing-page improvement. The delta between the two is usually the strongest argument for fixing the funnel before scaling the spend.
Channel benchmarks we pre-fill (and where they come from)
The defaults below are public benchmarks, not numbers we invented. Override them with your own data the moment you have it. Figures as of mid-2025; we re-date them as the sources update.
| Channel | Avg. cost per click | Typical landing-page conversion rate | Best for |
|---|---|---|---|
| Google Search | ~$5.26 | ~7.5% | High-intent, ready-to-buy demand |
| Meta (Facebook / Instagram) lead gen | ~$1.92 | varies widely by offer | Cheaper clicks, demand you create |
| ~$5 to $12 | lower volume, higher intent | B2B and high-ticket sales |
Sources: Google Search and Meta figures from WordStream's 2025 Google Ads and Facebook Ads benchmarks; LinkedIn range from published 2025 industry data. These are all-industry averages. Your real numbers will differ by vertical, geography, offer, and how good your landing page is, which is exactly why every field is editable.
A blunt note on the benchmarks: averages hide a lot. Legal and home-services CPCs run far north of $7 on Search; restaurants and entertainment run under $2.50. The right default for you isn't the all-industry mean, it's the number from your account. Until you have that, the calculator gives you a defensible starting point; the gap between a $2 CPC and an $8 CPC is the difference between a viable plan and a fantasy, so don't plan a vertical's budget on a cross-vertical average for longer than you have to. (If you're weighing the platform choice itself, our breakdown of Meta ads vs Google Ads for lead gen covers when each one wins.)
Why we built this (and what it won't do)
We built it because "how much should I spend on ads" is the single most-asked question in our first calls, and almost everyone answers it backward. They pick a budget, spend it, and hope. The right order is goal first, math second, budget last. This tool enforces that order.
What it won't do: promise you the goal. The calculator tells you the spend a set of assumptions implies, not what your market will bear. CPCs move, auctions get competitive, and a weak landing page can torch the whole model. Treat the output as a planning estimate to pressure-test, not a guarantee. If your number comes back far higher than your budget allows, that's not the tool being wrong; that's the tool doing its job and telling you the goal and the budget don't match yet.
It also stops at media spend plus an optional fee. It doesn't model lifetime value, repeat purchases, or return on ad spend over time, so a channel that looks expensive on a single sale can still be the right call once repeat revenue is in the picture. If you're sizing the longer horizon, pair this with the SEO ROI calculator to see how paid and organic stack up on payback.
When you've got your number, the natural next question is which channels to put it in. That's a different tool: the marketing channel mix calculator splits a budget across Search, social, and the rest based on your goal. Run this one first, then that one.
Got your number? Let's pressure-test it.
A calculator gives you an estimate. A senior strategist tells you whether it'll hold up in your market, where the funnel will leak, and which channel to point it at first. That's a 30-minute conversation, not a sales pitch.
No quote-form games. No junior rep reading a script. Just real talk about whether your goal and your budget are in the same zip code, and what it takes to close the gap. (If you want our full pricing picture first, it's all on the pricing page; no "contact us for a quote" wall.)
Book 30 minutes. No pressure and no jargon, just the real picture. Or email us straight at admin@moonsauceagency.com and bring your number.
