At some point in the last month, someone asked you how your sales are going. And you gave them a number. Maybe it was a revenue figure. Maybe it was a deal count. Maybe it was a vague "we're up" with a confident nod.
What they actually needed — and what you should be tracking with ruthless precision — is your percentage increase in sales. Not the raw number. The rate of change. Because a business doing $400,000 this quarter versus $320,000 last quarter isn't just "$80,000 more." It's 25% growth — a number you can benchmark, project, communicate to investors, and use to make real decisions about where to allocate resources next quarter.
The formula itself takes 30 seconds to learn. The part most CEOs get wrong is what to do with the number once they have it. That's what this guide covers.
The Percentage Increase in Sales Formula
As defined mathematically, a percentage increase measures how much a value has grown relative to its starting point, expressed as a proportion of that starting point. For sales, it works like this:
That's it. No mystery. No advanced mathematics. The only variable that trips people up is knowing which two numbers to plug in — and over which time period to measure. We'll cover both.
Step-by-Step Breakdown
- Identify your "Old Sales" figure — the baseline period (last month, last quarter, last year)
- Identify your "New Sales" figure — the current period you're measuring
- Subtract: New Sales − Old Sales = the raw change in dollars
- Divide: Raw change ÷ Old Sales = decimal growth rate
- Multiply by 100 to convert to a percentage
Always divide by the old (baseline) number, not the new one. A common mistake is dividing by the new sales figure, which understates growth and produces a meaningless result. The baseline is the denominator — always.
Three Worked Examples Across Different Business Types
- Last year's ARR: $1,200,000
- This year's ARR: $1,740,000
- Subtract: $1,740,000 − $1,200,000 = $540,000
- Divide: $540,000 ÷ $1,200,000 = 0.45
- Multiply by 100: 45% YoY growth
- January sales: $84,000
- February sales: $79,000
- Subtract: $79,000 − $84,000 = −$5,000
- Divide: −$5,000 ÷ $84,000 = −0.0595
- Multiply by 100: −5.95% MoM decline
- Q1 revenue: $310,000
- Q2 revenue: $388,000
- Subtract: $388,000 − $310,000 = $78,000
- Divide: $78,000 ÷ $310,000 = 0.2516
- Multiply by 100: 25.2% QoQ growth
Sales Growth Calculator
Enter your own numbers below. The calculator will compute your percentage increase — and tell you immediately whether that growth rate is a cause for celebration or a call to action.
YoY vs. MoM vs. QoQ: Which Comparison Period Actually Matters
You can calculate a percentage increase over any time period. The question is which comparison period gives you useful information — versus a number that looks meaningful but tells you nothing about your actual business trajectory.
| Period | What It Measures | Best Used For | Watch Out For |
|---|---|---|---|
| Year-over-Year (YoY) | Same period, consecutive years (e.g. Q2 2024 vs Q2 2025) | Strategic decisions, investor reporting, true business trajectory | Can mask recent momentum shifts — a terrible Q2 last year makes this Q2 look great automatically |
| Month-over-Month (MoM) | Consecutive calendar months | Short-term momentum tracking, campaign performance | Highly vulnerable to seasonality — February always looks bad after January |
| Quarter-over-Quarter (QoQ) | Consecutive fiscal quarters | Board reporting, operational rhythm tracking | Still has seasonal noise, especially Q4 vs Q1 comparisons in consumer businesses |
| Rolling 12-Month | Last 12 months vs. prior 12 months | Smoothest view of true trend — eliminates almost all seasonal distortion | Slower to update; a single bad month takes 12 months to "age out" of the calculation |
For strategic decisions and investor conversations: always use Year-over-Year — it eliminates seasonal noise and gives the truest signal of business trajectory.
For operational monitoring and catching problems early: use Month-over-Month — but always contextualize against the same month last year before drawing conclusions.
Growth Rate Benchmarks: Is Your Number Actually Good?
A 20% growth rate sounds impressive. But is it? That depends entirely on your stage, your industry, and the economic environment you're operating in. Here are the benchmarks that matter, grounded in what the market actually expects from businesses at each stage.
| Business Type / Stage | Strong Growth | Acceptable | Cause for Concern |
|---|---|---|---|
| Early-stage SaaS (<$1M ARR) | 150%+ YoY | 80–150% YoY | <50% — product-market fit question |
| Growth-stage SaaS ($1M–$10M ARR) | 80–100%+ YoY | 40–80% YoY | <30% — efficiency problem |
| Scale-stage SaaS ($10M–$50M ARR) | 50–60%+ YoY | 25–50% YoY | <20% — go-to-market problem |
| B2B Services / Consulting | 30–50%+ YoY | 15–30% YoY | <10% — stagnant |
| Retail / Brick & Mortar | 10–20%+ YoY | 5–10% YoY | <3% — at risk of inflation erosion |
| Manufacturing | 15–25%+ YoY | 8–15% YoY | <5% — margin pressure imminent |
| E-commerce | 40–60%+ YoY | 20–40% YoY | <15% — category losing share |
A 50% growth rate off a $100,000 base is $50,000 in new revenue. A 15% growth rate off a $10,000,000 base is $1,500,000 in new revenue. Percentage growth without absolute dollars is an incomplete picture. Track both — percentage for trend analysis, absolute dollars for business impact.
5 Mistakes CEOs Make Calculating Sales Growth
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01
Comparing against a terrible baseline
If your Q2 last year was disastrously bad for reasons outside your control (supply chain, a lost anchor client, a product failure), this Q2 will look phenomenal by comparison — even if you've barely recovered to normal. Always ask: was the baseline period representative? If not, find a more meaningful comparison point.
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02
Using gross revenue instead of net revenue
Gross revenue before refunds, chargebacks, and discounts can overstate your actual growth significantly — especially in ecommerce businesses with high return rates. Always calculate growth on net collected revenue. The number that matters is the money that actually stayed in your account.
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03
Ignoring unit economics inside the growth
Revenue up 30% with profit margin down 15% is not a success story — it's a warning sign. Track your growth rate alongside your gross margin and CAC. Revenue growth that comes with deteriorating unit economics is a time bomb, not a milestone.
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04
Confusing booked revenue with collected revenue
In B2B sales, there is often a meaningful gap between when revenue is "booked" (contract signed) and when it's collected (payment received). Growing your booked pipeline feels great. Growing your collected revenue is what actually runs the business. Track both, but make decisions on collected.
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05
Not separating new revenue from expansion revenue
If your total revenue is up 25%, how much of that is from new customers versus expansion of existing customers? These two numbers require completely different strategic responses. New customer growth means your acquisition is working. Expansion revenue growth means your product is delivering value. Flat new customer growth masked by expansion is a future acquisition problem you need to solve now.
Using Your Growth Rate to Make Better Decisions
The percentage increase in sales isn't a number for a slide deck. It's a diagnostic tool. Once you know your growth rate — by period, by segment, by channel — you can answer the questions that actually drive better decisions:
- Which channel is growing fastest? — Allocate more resource to it. Systematically.
- Which customer segment has the highest growth rate? — Narrow your ICP toward it.
- Is the growth rate accelerating or decelerating? — Deceleration is the most important early warning in any business. A growth rate moving from 40% to 35% to 28% over three consecutive quarters is a more urgent signal than a single low-growth quarter.
- Is growth coming with improving or deteriorating margins? — The answer determines whether you're building a sustainable business or an expensive one.
Tools for Tracking Sales Growth Rate
You don't need sophisticated software to track percentage increase in sales accurately. You need consistent data and a consistent method. Here's what works at different stages:
For Businesses Under $1M Revenue
A well-structured spreadsheet is perfectly adequate. Build a simple monthly revenue tracker with automatic percentage change calculations. Google Sheets is free and will handle everything you need. The formula in a cell: =(B2-A2)/A2*100 where A2 = old sales and B2 = new sales.
For Businesses $1M–$10M Revenue
Your CRM should be generating revenue reports automatically. If it isn't, your CRM is misconfigured. Salesforce and most modern CRMs have built-in YoY and MoM comparison reports. Set these up as dashboard tiles that your team sees every Monday morning — not buried in a monthly report that gets glanced at once.
For Businesses $10M+ Revenue
At this stage, you need revenue analytics that segments growth by channel, customer cohort, product line, and geographic market. Tools like Tableau, Looker, or the native analytics within your ERP give you the granularity to move from "revenue is up 22%" to "revenue is up 22%, driven primarily by enterprise expansion in the Southwest with new customer acquisition flat — which means we have an acquisition problem hiding inside a strong headline number."
That level of granularity is where growth rate analysis becomes genuinely powerful. The headline percentage is the starting point. The segmentation is the insight.
FAQ: How to Calculate Percentage Increase in Sales
The formula is: ((New Sales − Old Sales) / Old Sales) × 100 = Percentage Increase. Example: if sales went from $200,000 to $260,000, the calculation is ((260,000 − 200,000) / 200,000) × 100 = 30% increase. Always divide by the old (baseline) number, not the new one.
A good sales growth rate depends on your stage and industry. For early-stage SaaS: 100%+ annually. Growth-stage B2B ($5M–$50M): 30–60% annually. Established SMBs: 15–25% annually. Retail and brick-and-mortar: 5–15% annually. Anything below 10% in a growing market warrants a serious process audit.
Month-over-month (MoM) sales growth = ((This Month's Sales − Last Month's Sales) / Last Month's Sales) × 100. For example, if January sales were $80,000 and February sales were $92,000: ((92,000 − 80,000) / 80,000) × 100 = 15% MoM growth.
Year-over-year (YoY) growth compares the same period across two consecutive years — e.g., Q2 2024 vs Q2 2025. This eliminates seasonal distortion. Month-over-month (MoM) growth compares consecutive months and is useful for tracking momentum but is heavily influenced by seasonality. Use YoY for strategic decisions; use MoM to track short-term momentum.
Yes. When current sales are lower than the comparison period, the result is a negative percentage — a sales decline. For example, if sales dropped from $300,000 to $240,000: ((240,000 − 300,000) / 300,000) × 100 = −20%. A negative growth rate is not a math error — it is an urgent business signal.
The Math Is Easy. Using It Is the Work.
The percentage increase formula takes 30 seconds to apply. The hard part is building the discipline to track it consistently, segment it correctly, and use it to make better decisions instead of just better presentations.
Your growth rate is a diagnostic number. It tells you whether the decisions you made last quarter worked. It tells you which channels are compounding and which are stalling. It tells you whether your business is accelerating or slowly decelerating in a way that won't show up as a crisis until it's already one.
Track it every month. Segment it by channel and customer type. Benchmark it against your stage. And when it's not where it needs to be — which is when most of you will have found this article — use it to identify exactly which revenue lever is the problem, not just that a problem exists.