Feel sharper at your desk.Size up deals in real time.
Built by an investment professional who has interviewed, hired, and mentored countless junior professionals over two decades. This is the missing math resource for your career trajectory.
22 of 30 levels free · No account required · No ads
Just open, play, and get sharper
Complete 100 questions daily whenever you have 5 minutes—on the train, between meetings, waiting for coffee. The app starts at Level 1 each day as a warm-up, then automatically advances through increasingly challenging content.
Develop your estimation ability
Top professionals process numbers naturally all day long, but until now, there hasn't been a good way to develop this skill. Get the reps and techniques in a low-stress environment (untimed, unscored).
Warm up with fundamentals
Each day starts fresh at Level 1, building automatic recall through arithmetic and core multiplication.
Progress automatically
As you answer correctly, the app advances through 30 levels of increasingly challenging estimation problems.
Learn multiple solution paths
Every problem includes detailed explanations showing various estimation techniques—not rigid procedures.
30 levels. Basics to boardroom.
Nothing beyond 6th grade math. Everything you actually use.
No fluff. No friction.
Streak Tracking
Daily practice with streak tracking to build consistency and momentum.
Practice Mode
Targeted skill building on any level, any time—not just during the daily game.
Works Offline
100% offline capable. No account required. Your data stays on your device.
International Formats
Customizable settings including international number formats for global professionals.
FAQ
How is this different from other math apps?
Most math apps have very limited arithmetic and focus on standard academic math (algebra, etc). FiveMinuteFox trains estimation and covers the math that you actually encounter in the business world. In addition, Levels 22–30 provide basic and advanced material specific to sectors in the financial industry.
I'm not great at math. Is this for me?
Absolutely. The app uses nothing beyond 6th grade concepts—addition, subtraction, multiplication, division, percentages, and fractions. What we're building is confidence and intuition with these basics, which anyone can develop with practice.
Who is this designed for?
Finance professionals, MBA students, investment bankers, private equity and real estate analysts, consultants—anyone whose job involves discussing numbers in meetings, negotiations, or deal conversations. If you've ever stayed quiet because you weren't confident in your mental math, this is for you.
How long until I see results?
Most users notice improved confidence within a week or two of consistent practice. The daily warm-up system builds muscle memory quickly—you'll find yourself naturally estimating numbers in meetings and feeling confident enough to speak up.
What does the free version include?
22 of 30 levels are free—enough to build strong fundamentals and experience the full daily progression. Premium unlocks the 8 finance specialty levels (real estate, corporate finance, PE, fixed income), all 30 levels in Practice Mode, and removes delay screens. Premium is $4.99/month or $29.99/year, with a free one-month trial on all subscriptions.
Start today. Feel the difference this week.
No account required. No ads. Just open and play.