If you’ve ever plugged a keyword into Ahrefs or SEMrush and stared at that difficulty number wondering what it really means, you’re not alone. Understanding what is keyword difficulty and how to measure it is one of the most practical skills you can develop as a business owner doing SEO in Singapore. Get it wrong, and you’ll spend six months creating content that never cracks page one. Get it right, and you’ll consistently pick fights you can win.
I’ve seen this play out dozens of times with clients. A new e-commerce brand targets “best running shoes” (KD 87) when they could rank for “best running shoes for flat feet Singapore” (KD 22) within weeks. The second keyword has lower volume, sure. But it converts at 3x the rate because the searcher knows exactly what they want.
Let me walk you through how keyword difficulty actually works, how the tools calculate it, and how to use it to make smarter decisions for your site.
Keyword Difficulty Explained Simply
Keyword difficulty (KD) is a metric that estimates how hard it will be for your page to rank in the top 10 organic results for a given search term. Most SEO tools score it from 0 to 100. The higher the number, the more competitive the keyword.
But here’s what most people miss: keyword difficulty is not a universal truth. It’s a tool-specific estimate based on that tool’s particular algorithm. Ahrefs might score a keyword at 45 while SEMrush scores the same keyword at 62. Neither is “wrong.” They’re just measuring different signals with different weightings.
Think of it like two different property agents valuing the same HDB flat. Both use legitimate methods, but they’ll give you slightly different numbers. What matters is that you use one tool consistently and understand what its score actually represents.
Why Keyword Difficulty Matters for Your SEO Strategy
Every keyword you target costs you something. Time to research, money to create content, effort to build links. Keyword difficulty helps you allocate those resources where they’ll actually produce results.
Without factoring in difficulty, you’re essentially walking into a poker game without knowing who’s at the table. You might be sitting across from PokerStars champions with a pair of threes.
It Prevents Wasted Content Investment
I worked with a Singapore-based fintech startup that had published 40 blog posts in their first year. Traffic? Almost zero. The problem was clear when we audited their keyword targets. They were going after terms like “best credit card” and “personal loan rates” where DBS, OCBC, and MoneySmart dominated with domain authorities above 70. Their DA was 12.
After we shifted their strategy to target long-tail keywords with difficulty scores between 10 and 30, their organic traffic grew by 340% in four months. Same writing team, same budget. The only change was picking winnable keywords.
It Helps You Build a Realistic Timeline
A keyword with a difficulty of 15 might take you 4 to 8 weeks to rank for with solid on-page SEO and a few quality backlinks. A keyword at 65 could take 6 to 12 months, even with aggressive link building. Knowing this upfront lets you set expectations with your boss, your team, or yourself.
How Keyword Difficulty Is Calculated Behind the Scenes
Each tool has its own formula, but they generally analyse the same core signals. Understanding these signals is more useful than memorising any single tool’s scoring system, because it teaches you to evaluate competition with your own eyes.
Backlink Profiles of Top-Ranking Pages
This is the single biggest factor in most keyword difficulty calculations. Ahrefs, for example, bases its KD score primarily on the number of referring domains linking to the top 10 results. If the pages ranking on page one for “accounting software Singapore” each have 80 to 200 referring domains from quality sites, you’ll need a comparable link profile to compete.
Here’s a practical way to check this yourself: search your target keyword, open the top 5 results, and run each URL through a backlink checker. If the average referring domain count is under 20, you’re looking at a realistic target. If it’s above 100, you’ll need a serious link-building campaign or a different keyword.
Domain Authority of Competing Sites
Domain Authority (Moz’s metric) or Domain Rating (Ahrefs’ version) reflects the overall strength of a website. When the top results are dominated by sites like government portals (.gov.sg), major media outlets, or established brands with DAs above 60, the keyword is inherently harder to crack.
For Singapore-specific searches, you’ll often see sites like HardwareZone, Mothership, The Straits Times, and government sites occupying top positions. If your DA is 25, competing head-to-head with these sites on broad terms is unrealistic. But you can absolutely outrank them on specific, niche queries where they haven’t created dedicated content.
Page-Level Authority and Optimisation
Sometimes a high-DA site ranks for a keyword almost by accident, with a page that isn’t particularly well-optimised. This is your opportunity. If the top results have weak title tags, thin content, or poor user experience, the actual difficulty of ranking may be lower than the tool’s score suggests.
I always tell our team: the KD score is the starting point, not the final answer. You need to manually review the SERP to spot these gaps.
Content Depth and Search Intent Alignment
Google has become remarkably good at understanding what a searcher actually wants. If the top 10 results for a keyword are all comprehensive guides with 2,000+ words, comparison tables, and original data, that’s the benchmark you need to meet or exceed.
Conversely, if the current results are thin, outdated, or don’t fully address the query, you have a real opening. This qualitative assessment is something no difficulty score can capture fully. It requires you to actually read the competing pages.
Search Volume’s Indirect Effect
Search volume doesn’t directly feed into most KD calculations, but it correlates strongly with competition. A keyword searched 50,000 times per month attracts more competitors than one searched 200 times. That said, in Singapore’s market, a keyword with 500 monthly searches can be extremely valuable if it has strong commercial intent. “Office renovation contractor Tuas” might only get 90 searches a month, but each of those searchers could represent a $50,000 contract.
How to Measure Keyword Difficulty: A Step-by-Step Process
Here’s the exact process I use when evaluating keyword difficulty for our clients. You can replicate this with any major SEO tool.
Step 1: Generate Your Keyword List
Start with a seed keyword related to your business. Plug it into Ahrefs Keywords Explorer, SEMrush Keyword Magic Tool, or even Google’s free Keyword Planner. Export the full list, including difficulty scores, search volumes, and CPC data.
For a Singapore audience, make sure you’re filtering by Singapore as your target country. Global difficulty scores are meaningless if your customers are in Jurong, not Jakarta.
Step 2: Sort and Filter by Difficulty Ranges
Organise your keywords into buckets. I use these ranges as a working framework:
- 0 to 20 (Low): Quick wins. Target these first if your site is newer or has a DA under 30.
- 21 to 50 (Moderate): Achievable with strong content and 5 to 15 quality backlinks. Good for sites with some established authority.
- 51 to 80 (High): Requires significant content investment, a robust backlink strategy, and typically 3 to 6 months of sustained effort.
- 81 to 100 (Very High): Dominated by major brands and authority sites. Only target these as part of a long-term play, or use them to inspire more specific long-tail variations.
Step 3: Manually Audit the Top 10 Results
This is where most people skip, and where the real insight lives. For each keyword you’re seriously considering, Google it and examine the first page. Ask yourself these questions:
Are the top results from massive authority sites, or are there smaller, niche sites ranking? Is the content genuinely excellent, or is it generic and outdated? Are there featured snippets, People Also Ask boxes, or other SERP features you could target? Do the top pages have strong on-page SEO (optimised titles, proper heading structure, internal links)?
If you spot weak content from mid-authority sites ranking in positions 5 through 10, that’s a green light. You can likely outperform them with better content and targeted link building.
Step 4: Assess Your Own Site’s Competitive Position
Be brutally honest here. Check your own domain authority, your existing backlink profile, and the quality of your current content. If your DA is 15 and the average DA on page one is 55, you need to either pick a different keyword or commit to a 6 to 12 month campaign.
One useful benchmark: if your DA is within 15 to 20 points of the weakest site on page one, and you can create demonstrably better content, the keyword is worth pursuing.
Step 5: Build a Balanced Keyword Portfolio
Think of your keyword strategy like a CPF portfolio. You want a mix of low-risk, quick-return keywords (your Ordinary Account) and higher-difficulty, higher-reward keywords (your Special Account). The quick wins fund your patience for the bigger plays.
Aim for roughly 60% low-to-moderate difficulty keywords and 40% moderate-to-high. This gives you consistent traffic growth while building toward more competitive terms over time.
Common Mistakes When Using Keyword Difficulty Scores
Treating the Score as Gospel
I’ve seen a KD 55 keyword where the top results were poorly written forum threads from 2018. We ranked a client’s page in position 3 within five weeks. The score said “hard.” The reality said “wide open.” Always verify with manual SERP analysis.
Ignoring Search Intent Completely
A keyword might have a low difficulty score, but if the top results are all product pages and you’re writing an informational blog post, you won’t rank. Google serves results that match what the searcher wants. Match the intent first, then worry about difficulty.
Chasing Volume Over Relevance
In Singapore’s compact market, a keyword with 200 monthly searches and a clear purchase intent can outperform a keyword with 5,000 searches and vague informational intent. A “best CRM for SME Singapore” searcher is far more valuable than someone searching “what is CRM.”
Using Different Tools Interchangeably
Comparing an Ahrefs KD of 30 with a SEMrush KD of 30 is comparing apples to rambutans. Stick with one tool for consistency. If you switch tools, recalibrate your understanding of what each score range means in practice.
Frequently Asked Questions About Keyword Difficulty
Why Do Different SEO Tools Show Different Keyword Difficulty Scores?
Each tool uses its own proprietary algorithm. Ahrefs weights referring domains heavily. SEMrush factors in more on-page signals. Moz uses its own DA calculations. The scores are directionally similar but rarely identical. Pick one tool and learn its scoring patterns.
Should a New Website Only Target Low-Difficulty Keywords?
Mostly, yes, but not exclusively. Start with keywords in the 0 to 25 range to build traffic and authority. Once you’ve established some domain strength (DA 20+), begin mixing in moderate-difficulty keywords. Trying to rank for KD 70+ terms with a brand-new site is like entering a marathon on your first day of running.
Can I Rank for a High-Difficulty Keyword Without Backlinks?
In rare cases, yes, particularly for very localised or niche queries where the competition is thin despite a high KD score. But for most keywords above KD 40, you’ll need at least some quality backlinks. Content alone usually isn’t enough when competing pages have strong link profiles.
How Often Should I Reassess Keyword Difficulty?
Every 3 to 6 months for your core keywords. Competition shifts as new sites enter the market, existing sites publish new content, and Google updates its algorithm. A keyword that was KD 60 last year might be KD 45 now if a major competitor stopped investing in their content.
Put This Into Practice
Understanding keyword difficulty gives you a real competitive advantage, but only if you act on it. Start by auditing your current keyword targets. Are you chasing terms that are realistically within reach, or are you burning resources on keywords where you have no chance of ranking in the next 12 months?
If you’d like a second pair of eyes on your keyword strategy, we run detailed keyword opportunity audits for Singapore businesses. No fluff, just a clear breakdown of which keywords you should target now, which ones to build toward, and which ones to skip entirely. Reach out to us here and let’s look at your data together.