£ GBP

CAC, LTV & SaaS Growth Calculators for UK Businesses

Currency-aware calculators in GBP (£) for United Kingdom businesses. Model your customer acquisition cost, lifetime value, ROAS, and more — with example scenarios in your local currency.

The UK SaaS market is Europe's most mature, with London serving as a major fintech, martech, and B2B hub. Pricing in pounds sterling (£) means your unit economics reflect local purchasing power, which differs materially from dollar-denominated benchmarks. UK founders raising from local VCs are expected to present metrics in GBP.

VAT at 20% complicates revenue recognition — make sure your MRR and ARR figures are VAT-exclusive when comparing to industry benchmarks. The UK's strong agency and freelancer economy also means blended CAC often includes outsourced marketing costs that some US companies handle in-house.

Use these currency-aware calculators to model your SaaS metrics in pounds, plan sterling-denominated budgets, and present clean unit economics to UK and European investors without the noise of exchange-rate conversions.

Example Scenarios in GBP

These are illustrative examples using realistic numbers in GBP — not benchmarks. Use the calculators below with your own data.

A London B2B SaaS spending £35,000/month on demand gen acquires 70 customers — a CAC of £500. With ARPU of £95/month, 80% margin, and 2.5% churn, LTV is approximately £3,040, giving a 6.1:1 ratio.
An e-commerce retailer spends £12,000 on Google Shopping and generates £54,000 in revenue: a 4.5:1 ROAS. At 40% margin, break-even ROAS is 2.5:1 — comfortably profitable.
A SaaS startup with £800K ARR adds £30K net new ARR on £25K quarterly S&M, yielding a Magic Number of 1.2 — strong enough to justify increasing spend next quarter.

All Calculators in GBP (£)

CAC Calculator

Measure how much you spend to acquire each new customer by dividing total acquisition spend by new customers acquired.

CAC = Total Acquisition Spend ÷ New Customers Acquired

LTV Calculator

Estimate the total revenue a customer generates over their relationship with your business.

LTV = (ARPU × Gross Margin) ÷ Churn Rate

LTV:CAC Ratio

Compare customer lifetime value to acquisition cost to assess whether your growth is profitable and sustainable.

LTV:CAC Ratio = LTV ÷ CAC

ROAS Calculator

Measure how much revenue your advertising generates for every dollar spent.

ROAS = Revenue from Ads ÷ Ad Spend

CAC Payback Period

Find how many months it takes to recover the cost of acquiring a customer through their gross margin contribution.

Payback Period = CAC ÷ (ARPU × Gross Margin)

Break-even ROAS

Determine the minimum ROAS required to break even after accounting for gross margin and other variable costs.

Break-even ROAS = 1 ÷ Gross Margin

Budget Planner

A free marketing budget calculator that reverse-engineers the spend you need to hit revenue targets from CAC and funnel metrics.

Budget = Target Customers × CAC

Churn Impact

Quantify how monthly churn affects revenue, LTV, and the value of retention improvements.

Revenue at Month N = Starting MRR × (1 − Churn)^N

Funnel Planner

Model conversion rates at each funnel stage to forecast leads, opportunities, and closed revenue.

Customers = Traffic × Visit-to-Lead × Lead-to-Opp × Opp-to-Close

MRR Calculator

Calculate monthly recurring revenue (MRR) instantly: Active Customers × ARPU, with growth and churn context for SaaS.

MRR = Active Customers × ARPU

ARR Calculator

Calculate annual recurring revenue (ARR) instantly: MRR × 12, the investor-standard SaaS scale metric.

ARR = MRR × 12

Magic Number

Measure how efficiently your sales and marketing spend generates new annual recurring revenue.

Magic Number = New Bookings (ARR) ÷ Prior Quarter S&M Spend

Burn Multiple

Calculate your SaaS Burn Multiple with the standard formula (Net Burn ÷ Net New ARR) to measure capital efficiency.

Burn Multiple = Net Burn ÷ Net New ARR

Rule of 40

Combine revenue growth rate and EBITDA margin to measure overall SaaS business health.

Rule of 40 = Revenue Growth % + EBITDA Margin %

ASP Calculator

Find the average revenue per closed deal to benchmark pricing and sales performance.

ASP = Total Revenue ÷ Number of Deals

AOV Calculator

Calculate the average amount customers spend per order to optimize pricing and promotions.

AOV = Total Revenue ÷ Number of Orders

NRR Calculator

Calculate NRR (Net Revenue Retention), also called NDR (Net Dollar Retention), including expansion, contraction, and churn.

NRR = (Starting MRR + Expansion − Contraction − Churn) ÷ Starting MRR × 100

CPA Calculator

Measure how much you spend for each conversion (lead, signup, or purchase) in a campaign or channel.

CPA = Total Ad Spend ÷ Conversions

CPC Calculator

Calculate cost per click (CPC) instantly: divide ad spend by clicks to see how much you pay for each visit from paid ads.

CPC = Total Ad Spend ÷ Clicks

CPM Calculator

Calculate CPM (cost per mille / cost per thousand impressions) with the standard formula: (Ad Spend ÷ Impressions) × 1,000.

CPM = (Total Ad Spend ÷ Impressions) × 1,000

CTR Calculator

Calculate click-through rate (CTR) as a percentage: divide clicks by impressions and multiply by 100.

CTR = (Clicks ÷ Impressions) × 100

ROI Calculator

Measure profitability of an investment as net profit divided by cost.

ROI = ((Revenue - Cost) ÷ Cost) × 100

Why Use Currency-Aware Calculators for United Kingdom?

Native GBP Support

All calculators open with GBP (£) pre-selected so your inputs and outputs are in your local currency from the start.

Local-Currency Scenarios

Example scenarios above use realistic GBP figures so you can see how the metrics work in your market context.

Connected Dashboard

All metrics feed into one Growth Dashboard for scenario modeling, regardless of region.

100% Free

No signup required. All calculators are free for United Kingdom businesses of any size.

Looking for other regions? Browse all regional calculator hubs or explore calculators for SaaS and for e-commerce.