KSI, also known as Olajide Olatunji, is a famous YouTuber. He has over 18 million subscribers on YouTube and over 10 billion views.
He’s one of the most popular YouTubers in the world. So, let’s take a look at KSI’s Net worth, Salary, Earnings, and more.
KSI’s Biography and Career
KSI is a British YouTuber born 19 June 1993 in London, England. He has over 18 million subscribers on his YouTube channel, where he posts comedic videos and challenges with other YouTubers.
He also acts in rap music under the pseudonym KSIOlajidebt (pronounced “Chidiobt”). He has released three mixtapes called White Gold: The Mixtape Volume 1-3, released between 2012 and 2014.
Professional Career
KSI (Kay Olanre Oluwatuminuwa) is a British YouTuber and former rapper. Youtuber KSI, whose real name is Olajide William Olatunji, is a British internet personality, rapper, and boxer who has made a name for himself through his entertaining content on YouTube.
Born in Watford, England, in 1993, KSI was raised by his Nigerian parents alongside his younger brother Deji. He attended Berkhamsted School before dropping out to focus on his passion for creating content on YouTube.
KSI’s career began in 2009 when he created his first YouTube channel under the username KSIOlajideBT. His early videos consisted mainly of Fifa gameplay commentary and various comedic skits that quickly gained him a following.
In 2012, he released the single “Heskey Time,” which became an instant hit among fans and earned him critical acclaim.
Throughout his career, he has been featured on several TV shows. He has won two Guinness World Records for being the first to reach 10 million subscribers and 20 million subscribers on YouTube.
KSI also founded The KSIOlajidebt Network, which includes other popular channels, including SidemenTV and Caspar Lee’s channel (Caspar).
KSI’s Net Worth, Salary, and Earnings
As of 2025, KSI’s net worth is $27 million, according to Celebrity Net Worth.
He earns an estimated $1.5 million per year through YouTube ads, which account for a large part of his wealth.
Youtube Earning
KSI’s earnings as a YouTuber are quite impressive. He makes $10 million annually and earns $1 million per month! He also earns $125,000 per week and $20,000 per day.
| No. | Date | Fight | Billing | Network | Buys | Revenue |
| 1 | 25 August 2018 | KSI vs Paul | — | YouTube | 1,300,000 | £13,000,000 |
| 2 | 27 August 2022 | KSI vs Swarmz
KSI vs Alcaraz Pineda |
2 Fights 1 Night | DAZN | 445,000 | £4,450,000 |
| 3 | 14 January 2023 | KSI vs Temperrr | — | DAZN | 300,000 | £3,000,000 |
| 4 | 13 May 2023 | KSI vs Fournier | — | DAZN | — | — |
| Total | 2,045,000 | £20,450,00 | ||||
| No. | Date | Fight | Billing | Network | Buys | Revenue |
| 1 | 9 November 2019 | KSI vs. Paul II | — | DAZN (US) | 1,784,000 | — |
| Sky Box Office (UK) | 216,000 | £2,160,000 | ||||
| Total | 2,000,000 | £2,160,000 | ||||
Endorsement
KSI is a brand ambassador of Nissin. He has also signed up with Mountain Dew to represent their gaming division.
In addition, he has partnered with Nintendo and Call of Duty to promote their products.
KSI also has an endorsement deal with Microsoft, which helps him generate more money from his videos and live shows worldwide.
Quick Facts
| Full Name | Olajide Olayinka Williams Olatunji |
| Born | 19 June 1993 (age 29) |
| Birthplace | London, England |
| Nationality | England |
| Residence | England |
| Age | 29 |
| Subscribers | 24 million (main channel)
41.53 million (combined) |
| Total views | 5.95 billion (main channel)
10.55 billion (combined) |
| Net Worth | $27 million |
| Relationship | In Relationship |
| Spouse | Seana Cuthbert |
| KSI (@ksi) |
KSI’s Wife
KSI is dating YouTuber Seana Cuthbert. Seana Cuthbert is a YouTuber, blogger, and entrepreneur born in Singapore but now lives in London.
She has over 600,000 subscribers on her YouTube channel.
Age
KSI is 29 years old.
Height
KSI is 6 feet 0 inches tall and weighs around 78 kg (170 pounds). He has black hair and brown eyes.
FAQs
1. What does KSI stand for?
KSI stands for Knowledge Strength Integrity. It originates from a gaming clan in the video game Halo. KSI adopted this name when creating his YouTube channel, reflecting his early passion for gaming.
3. How did KSI become famous?
KSI gained fame by uploading gaming commentary videos, particularly of the FIFA series, on YouTube starting in 2009. His humorous content and engaging personality quickly attracted a large audience. Over time, he expanded into vlogs, music, and boxing, solidifying his status as a multi-talented entertainer.
3. What is KSI’s real name?
KSI’s real name is Olajide Olayinka Williams Olatunji. He was born on June 19, 1993, in London, United Kingdom, and grew up in Watford.
4. What is KSI’s net worth?
KSI’s net worth is estimated at $23 million. His wealth comes from multiple sources, including YouTube revenue, music sales, boxing matches, sponsorships, and business ventures like Prime Hydration.
5. Is KSI part of the Sidemen?
Yes, KSI is a co-founding member of the Sidemen, a British YouTube group known for challenges, reaction videos, and sketches. The group has been instrumental in his career growth and remains highly popular on YouTube.
6. Has KSI pursued a music career?
Yes, KSI has a successful music career. He released his debut EP Keep Up in 2015 and has since produced hit singles like Houdini and Holiday. His music spans genres like rap and pop, earning him chart success in the UK.
7. Is KSI a professional boxer?
KSI is also a professional boxer. He gained attention for his high-profile matches against fellow YouTuber Logan Paul in 2018 and 2019. These events contributed significantly to the rise of influencer boxing as a phenomenon.
8. How many subscribers does KSI have on YouTube?
KSI has over 25 million subscribers across his main channel and secondary channels like JJ Olatunji. His content ranges from gaming to music videos and reaction clips.
9. What businesses does KSI own or co-own?
KSI is the CEO of Misfits Boxing and co-founder of Prime Hydration alongside Logan Paul. Both ventures have been highly successful, with Prime gaining international recognition as a popular beverage brand.
10. Has KSI faced controversies during his career?
Yes, KSI has faced controversies, including criticism for inappropriate jokes early in his career and an incident at a gaming event in 2012. However, he apologized publicly and has since focused on creating positive content while growing as an entertainer and entrepreneur.
