One Day Agency

Marketing Tools & Calculators.

Marketing Scorecard

A diagnostic that scores your marketing performance across key channels and metrics so you can identify strengths and weaknesses at a glance.

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UTM Tag Generator

A generator that creates consistent, custom UTM parameters so you can track campaign performance cleanly in analytics.

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ROI Calculator

A tool to calculate return on investment by comparing revenue generated against marketing spend, giving you a clear efficiency figure.

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ROAS Target Calc

A calculator that helps define achievable return-on-ad-spend targets based on revenue goals and budget inputs.

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Reach and Frequency Calc

A calculator that helps define achievable campaign reach and ad frequency targets based on audience size and budget inputs.

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Search Ads Preview

A previewer that shows how your responsive search ad might display across different formats so you can optimise headlines and descriptions before launch.

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Color Stroop Test

A simple cognitive test measuring focus and reaction speed by challenging users to name the colour of a word that spells a different colour.

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Arrows Stroop Test

A variation of the Stroop test that evaluates attention and cognitive control by having users respond to arrow directions conflicting with position cues.

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Paid Ads Text Safe Area Calc

A calculator tailored for designers building creatives specific to paid social ads. Choose your platform and your format, and get your safe text area.

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Creative Calculator

The Creative Composition Calculator is a precise, format-agnostic design tool that helps you calculate the mathematical focal points of your creative assets.

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Speak with our planning team today.

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👉 Who will you speak to?

At One Day, you speak directly with senior strategists and directors involved in the work, not account handlers or junior intermediaries. Expect straight advice from experts across Creative, OOH, Digital, and global media activation.

Shelby

Sailor

Scott

Klaudia

“Better decisions start with better information. One Day’s marketing tools turn the thinking behind our planning into practical ways to explore budgets, benchmark activity and pressure-test ideas before money goes into market.”

Ricardo Seixas, Founder and CEO, One Day Agency

Full-funnel Advertising Agency

Our Work

About Us

What our clients are saying…

Codorníu Raventos - International Brand Manager Europe & Asia

“About Nielsen data: It is once again very positive for us because while the category fell by 11.6% in value, and the cava category decreased by 5.6%, we are once again the green dot in the data, growing vs. the previous year's and increase of market share. These results are clearly related to the MKT campaigns during April and July. So, once again, thank you very much for your wonderful support. We are achieving great things in the UK thanks to these impactful marketing campaigns.”
Mark Hodson, VP of Marketing at UNiDAYS

"Freshers is such a pivotal moment for UNiDAYS. As the UK's leading student platform, working with a tried and trusted team was key. We've found that in One Day. Their professionalism and unique approach to measuring effectiveness and incrementality is truly exceptional.”
General Manager, Itchy Baby Co

“We needed a digital agency that rocks the pants off it in the social & digital space that was fast, flexible, insightful and fun. Critical for us was someone that was responsive, really understood paid digital, and had the ability to make short, sharp, quick creative ads. One Day is that Agency.”
Gurveer Chana, BigCommerce's Demand Generation Manager

“It was an incredible experience partnering with One Day Agency. We handed them a strict budget, and they met it and exceeded our expectations. Their professionalism, creativity, and unwavering support were instrumental in our campaign’s success. From designing and picking locations and strategies, they were with us every step of the way, and we couldn’t be happier with the results.”