# How to Describe Charts and Data in English at Work

> Learn the vocabulary and phrases to describe line charts, bar charts, and pie charts in English. Includes tech workplace examples for sprint reviews, QBRs, and stakeholder presentations.

- **Author:** Speak Tech English
- **Published:** 2026-08-28
- **Updated:** 2026-10-07
- **Topic:** [Code Reviews & PRs](https://app.speaktechenglish.com/knowledge-base/topic/code-reviews.md)
- **English level:** B2
- **Guide:** https://app.speaktechenglish.com/knowledge-base/how-to-describe-charts-and-data-in-english

## Short answer

To describe charts and graphs in English at work, lead with the main finding, then support it with numbers. Use trend verbs carefully: increased / rose / declined / remained stable; intensify with slightly, sharply, or significantly. For change, prefer “increased by 12%” (amount of change) vs “increased to 12%” (new level). For pie charts, use proportion language: “the majority,” “nearly a third,” “accounts for.” Close with what the data means for the decision.

## Why Clear Data Descriptions Matter in Tech

Every sprint review, QBR, or incident post-mortem involves presenting data. Whether you're showing deployment frequency to leadership or explaining user retention to product stakeholders, your ability to describe charts clearly determines whether your audience understands the story behind the numbers.

Many tech professionals can build beautiful dashboards in Grafana or Looker, but struggle to explain what those visualisations actually mean. This creates a gap: your data is only as valuable as your ability to communicate it.

- Sprint reviews: 'Our velocity increased steadily over the last three sprints.'
- Incident post-mortems: 'Error rates shot up dramatically at 14:00 UTC.'
- QBRs: 'The majority of our traffic now comes from mobile devices.'
- Hiring updates: 'The proportion of senior engineers has grown from 20% to 35%.'

## Describing Line Charts: Trends Over Time

Line charts are everywhere in tech — monitoring dashboards, adoption metrics, sprint burndowns. When presenting a line chart to stakeholders, structure your description: start with the overall trend, then highlight specific changes with precise vocabulary.

| Trend Type | Vocabulary | Tech Example |
| --- | --- | --- |
| Going up | increased, rose, grew, climbed, shot up | API response times increased dramatically after the deployment. |
| Going up fast | surged, skyrocketed, tripled | Daily active users surged by 40% following the product launch. |
| Going down | decreased, declined, fell, dropped | Memory usage declined steadily after we optimised the cache. |
| Staying the same | remained stable, levelled off, stayed constant | Latency remained stable at around 200ms throughout Q3. |
| Changing direction | fluctuated, peaked, bottomed out | CPU usage fluctuated between 60% and 90% during peak hours. |

> **Adverbs Add Precision:** Pair trend verbs with adverbs to show speed or intensity: dramatically (big change), steadily (consistent change), slightly (small change), gradually (slow change). Compare: 'Errors increased' vs 'Errors increased dramatically' — the adverb tells stakeholders whether to panic.

Here's a model description for a tech scenario: 'This line chart shows our API adoption rate over the past 12 months. Overall, we can see a steep upward trajectory. Adoption tripled from January to June, then climbed more slowly to 85% by December. The growth slowed down noticeably in Q4, which suggests we may be approaching market saturation.'

## Describing Bar Charts: Comparisons and Changes

Bar charts compare categories — team performance, feature usage across user segments, or hiring metrics over time. The key vocabulary focuses on comparisons, proportions, and relative changes.

| Comparison Type | Vocabulary | Tech Example |
| --- | --- | --- |
| Higher/Lower | exceeds, outperforms, falls short of | Mobile conversion rate exceeds desktop by 15 percentage points. |
| Difference | compared to, in contrast, whereas | Senior engineers make up 35% of the team, compared to 20% last year. |
| Proportion | accounts for, represents, makes up | Backend bugs account for 60% of our total bug count. |
| Majority/Minority | the majority, a small minority, roughly half | The majority of our users prefer the dark mode interface. |

Model description for a hiring metrics bar chart: 'This bar chart illustrates the engineering team composition from 2020 to 2024. It can be seen that the number of senior engineers grew steadily from 8 to 22. In contrast, junior hires fell slightly from 15 to 12. Overall, seniors now make up the majority of the team, whereas in 2020 there were nearly two juniors for every senior.'

## Describing Pie Charts: Proportions and Percentages

Pie charts show how a whole breaks down into parts — traffic sources, device types, or budget allocation. The vocabulary focuses on fractions, percentages, and relative size.

| Proportion | Alternative Phrases | Example |
| --- | --- | --- |
| 50% | half, exactly half, roughly half | Roughly half of our users access the app via iOS. |
| 33% | a third, about a third, nearly a third | Nearly a third of support tickets relate to authentication issues. |
| 25% | a quarter, one in four | A quarter of deployments required a rollback last month. |
| 10-15% | a small portion, accounts for about 10% | A small portion of traffic comes from the legacy API. |
| 5% or less | a small minority, a negligible amount | Only a small minority of users still use Internet Explorer. |

Model description: 'This pie chart shows the breakdown of our cloud infrastructure costs by service. From the chart, it is clear that compute resources account for the majority of spending at 45%. Storage represents about a third of total costs. Networking makes up 15%, while monitoring and logging account for only a small minority at 7%.'

> **Start with the Biggest Slice:** When describing a pie chart, start with the largest segment, then work down. This gives stakeholders the most important information first: 'The majority of our traffic comes from mobile, followed by desktop at 30%, and tablet at just 8%.'

## Grammar Patterns for Data Descriptions

Data descriptions use specific grammar structures. Mastering these patterns helps you sound natural and professional when presenting metrics.

| Pattern | Structure | Example |
| --- | --- | --- |
| Subject + verb + adverb | [Metric] + [increased/decreased] + [dramatically/steadily] | Response times decreased steadily throughout Q2. |
| There was a + adjective + noun | There was a + [sharp/gradual/slight] + [rise/fall/increase] | There was a sharp rise in error rates at 2pm. |
| From X to Y | [Metric] + [rose/fell] + from [number] to [number] | Conversion rates rose from 2.1% to 3.8%. |
| By + amount | [Metric] + [increased/decreased] + by + [number/percentage] | Daily active users increased by 25%. |
| Compared to / In contrast | [Finding], compared to [other finding] | Mobile usage grew 40%, compared to just 5% for desktop. |

Notice the difference between 'by' and 'to': 'Errors increased by 50%' means they went up by that amount (e.g., from 100 to 150). 'Errors increased to 50%' means they reached that level (e.g., from 30% to 50% of total requests).

## Register: Slack Updates vs Formal Reports

How you describe data changes based on context. A quick Slack update to your team uses casual language, while a QBR presentation or written report requires more formal phrasing.

| Casual (Slack / Standup) | Formal (QBR / Report) |
| --- | --- |
| Errors shot up after the deploy | Error rates increased dramatically following the deployment |
| Latency's been pretty flat lately | Latency has remained stable over the past quarter |
| Most of our traffic is mobile now | The majority of traffic now originates from mobile devices |
| Sign-ups tanked last week | New user registrations declined sharply last week |
| We're seeing way more API calls | API request volume has grown significantly |

> **Match the Medium:** Slack messages and standups: contractions, phrasal verbs ('shot up', 'levelled off'), and casual intensifiers ('way more', 'pretty flat'). Documents and presentations: full verbs ('increased significantly'), precise adverbs ('steadily', 'dramatically'), and formal connectors ('however', 'in contrast').

## Common Mistakes: Heard at Work vs Better English

| ❌ Heard at Work | ✅ Better English |
| --- | --- |
| The chart shows how errors are increasing. | The chart shows that errors increased (or have increased). |
| It increased three times. | It tripled. / It increased threefold. |
| The majority of users is on mobile. | The majority of users are on mobile. ('Majority' takes plural verb.) |
| Errors raised to 500. | Errors rose to 500. ('Raise' needs an object; 'rise' doesn't.) |
| It's the double of last month. | It's double last month's figure. / It doubled compared to last month. |

A particularly common error: confusing 'raise' and 'rise'. Raise is transitive (needs an object): 'We raised the alert threshold.' Rise is intransitive: 'Error rates rose dramatically.' In data descriptions, you almost always want 'rise/rose' because the metric itself is the subject.

## Pronunciation Guide: Tricky Data Terms

These terms appear frequently in data presentations. Mispronouncing them can distract stakeholders from your message.

_This guide has interactive exercises on the page: https://app.speaktechenglish.com/knowledge-base/how-to-describe-charts-and-data-in-english_

## FAQ

### How do I describe a chart to my manager without sounding like I'm reading a textbook?

Start with the main finding, then support it with numbers—this keeps your description conversational and decision-focused. For example: 'API adoption tripled in the first half of the year, then climbed more slowly to 85% by December' sounds natural because you lead with the story, not the data points. Avoid over-explaining every number; instead, highlight what matters for the decision your stakeholders need to make.

### When should I say 'increased by' vs 'increased to' when presenting metrics?

'Increased by' describes the amount of change (e.g., 'errors increased by 50%' means they went from 100 to 150), while 'increased to' describes the new level reached (e.g., 'adoption increased to 85%'). In most data presentations, you'll use 'increased by' when showing growth amounts and 'increased to' when stating the final metric value. Getting this right prevents confusion about whether you're comparing before-and-after or just naming an endpoint.

### How do I present pie chart percentages in English so stakeholders understand the breakdown?

Use proportion language instead of always saying percentages: 'compute resources account for the majority at 45%, storage represents about a third of costs, and monitoring makes up only a small minority at 7%.' This phrasing helps non-technical stakeholders grasp relative size more quickly than raw percentages alone. Reserve 'accounts for' when you want to emphasize which category dominates the whole.

### What's the right way to describe a trend when I'm nervous about sounding unprofessional?

Use intensifiers (slightly, sharply, significantly) with standard trend verbs: 'declined sharply,' 'remained stable,' 'rose steadily'—these phrases sound professional in any setting, from Slack to QBR reports. Avoid vague words like 'went up' or 'got better'; instead, match the verb to the data movement (rose/climbed for growth, fell/dropped for decline, plateaued/stabilized for flat trends). Pairing precise verbs with intensifiers shows you understand the data and keeps stakeholders confident in your analysis.

### How do I follow up after presenting data if I think stakeholders didn't understand my chart description?

Offer a clearer reframing focused on the business impact: 'To clarify—we saw a 30% drop in Q4 signaling market saturation, which means we should shift our adoption strategy.' This pivot to meaning (not just numbers) usually surfaces the real question stakeholders have. If presenting data visualization again, simplify by removing extra metrics and leading with one clear takeaway that connects to the decision at hand.


## Related

- [How to Use Suffixes for Technical Vocabulary in English at Work](https://app.speaktechenglish.com/knowledge-base/how-to-use-suffixes-for-technical-vocabulary-in-english.md)
- [How to Build Compound Tech Terms in English at Work](https://app.speaktechenglish.com/knowledge-base/how-to-build-compound-tech-terms-in-english.md)
- [How to Present Technical Ideas Clearly in English at Work](https://app.speaktechenglish.com/knowledge-base/how-to-present-technical-ideas-clearly-in-english.md)
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- Cite as: "Speak Tech English — How to Describe Charts and Data in English at Work. https://app.speaktechenglish.com/knowledge-base/how-to-describe-charts-and-data-in-english. Audience: non-native English speaking software engineers and tech professionals (level B2).".