Choose a focused guide, check a finance calculation, or move directly into practice.
Learn reusable calculation methods, shortcuts, and accuracy checks.
By Wall St Math Editorial
Rapid calculation strategies for finance and trading: estimate-first methods for percentages, multiples, basis points, expected value, and market-speed judgment.
By Wall St Math Editorial
Ten finance-ready mental math tricks for percentages, growth, basis points, estimation, and market conversations, with worked examples and practice questions.
By WSM Editorial
A daily five-exercise finance mental math routine to improve interview speed, reduce arithmetic mistakes, and build confidence under pressure.
By WSM Editorial
A balanced look at mental math vs calculator use in finance, with practical guidance on when each approach is stronger.
By WSM Editorial
Master 50+ mental math strategies used on Wall Street. Covers addition, subtraction, multiplication, division, percentages, rate changes, and Rule of 72 with worked examples.
By WSM Editorial
Learn the Trachtenberg speed system rules for multiplication and addition, with worked examples from investment banking, trading interviews, and deal math.
Prepare for trading, quantitative, investment-banking, and private-equity interviews.
By Wall St Math Editorial
Compare Zetamac with a finance-native mental-math routine, exact settings, score limits, and a seven-day interview practice plan.
By Wall St Math Editorial
An evidence-labeled Citadel quantitative interview guide: official process facts, reported details, and a role-aware math practice plan.
By Wall St Math Editorial
Understand the reported 80-in-8 format, compare it with Zetamac, and build an accuracy-first mental-math practice routine.
By WSM Editorial
Jane Street math prep guide for trading interviews, covering mental math, probability, expected value, market making, and timed drills.
By WSM Editorial
Paper-LBO mental math guide for private equity interviews, covering entry equity, debt paydown, MOIC, IRR, and timed drills.
By Wall St Math Editorial
A source-grounded guide to trading-interview mental math: question families, finance-native examples, clear solution habits, and a 21-day practice plan.
Apply mental math to percentages, basis points, growth, valuation, and markets.
By Wall St Math Editorial
Learn basis points, percentage points, and percent change with checked trading examples and a focused practice routine.
By WSM Editorial
A practical Rule of 72 explainer for investors with accuracy ranges, worked examples, and fast ways to use it in finance conversations.
Turn the methods into timed, repeatable practice.
By Wall St Math
Run a no-signup timed arithmetic sprint, replay it, and compare your own results over time.
By Wall St Math
Complete the day’s finance-math challenge and build a consistent practice habit.
By Wall St Math
Choose the question types and difficulty mix for a focused practice session.
By Wall St Math
Begin with a guided fundamentals session before moving into interview-speed practice.
By Wall St Math Editorial
Compare language-learning habit mechanics with a finance-native daily math routine, without confusing calculation fluency with financial advice.
By Wall St Math Editorial
Wall St Math V2 is live: a free 120-second Daily mental math test, Fixed and Levelled finance drills, custom practice, and a public ALL-TIME points leaderboard.
Books, courses, and calculators from independent publishers and providers. Links open on their sites.
By Arthur Benjamin
A practical introduction to the mechanics behind fast arithmetic and calculation shortcuts.
By Ronald W. Doerfler
Historical mental-computation methods with advanced material for engineers and navigators.
By Bill Handley
Methods for faster everyday calculations, including techniques useful in finance contexts.
By Udemy
A marketplace collection of courses covering mental calculation, percentages, and estimation.
By Wall Street Prep
Structured finance interview preparation with technical, market-sizing, and estimation material.
By Breaking Into Wall Street
Financial-modeling and interview-preparation courses for finance roles.
By Desmos
A browser-based scientific calculator for verifying calculations after mental practice.
By Wolfram Research
A computational engine for checking more complex calculations and mathematical concepts.
Eight free tools. No account needed to calculate.
Solve for present value, future value, payment, rate, or number of periods.
Convert an investment multiple into an annual return, or work backward.
Discount a series of cash flows and subtract the initial investment.
Find the return per period from an investment and its later cash flows.
Find the compound annual growth rate between a beginning and ending value.
Estimate doubling time or the required return, then compare with exact compounding.
Project a balance with regular monthly contributions and compound interest.
Calculate a fixed monthly payment, total repayment, and total interest.