All Games

Race through arithmetic. Addition, subtraction, multiplication, and more.

Calculate percentages, discounts, and markups in your head.

Master fractions: convert, add, subtract, multiply, and divide.

Master PEMDAS with expressions that punish left-to-right guessing.

Multi-digit mental multiplication under time pressure.

Watch prices flash by. Estimate the total.

Estimate square roots to the nearest hundredth.

Estimate logarithm values in different bases.

Estimate powers and exponentials from memory.

Estimate ratios and proportions from given quantities.

Powers, squares, cubes, and square roots. Mental math fundamentals.

Find primes, count primes, and master number theory.

Find the pattern and predict the next number in the sequence.

Convert between scientific notation and standard form.

Calculate greatest common divisors and least common multiples.

Calculate the average (mean) of a dataset. Mental arithmetic meets statistics.

Find the middle value in a dataset. Sort, locate, calculate.

Calculate the population standard deviation of a dataset.

Calculate probabilities for dice, coins, cards, and more.

Factorials, permutations, and combinations.

Calculate and interpret z-scores in normal distributions.

Future value, present value, and the Rule of 72. Know what your money is actually doing.

Price-to-earnings ratio calculations. Value investing fundamentals.

Calculate dividend yields and income from stocks. Income investing fundamentals.

Compound Annual Growth Rate. Normalize investment returns across different time periods.

Calculate average cost basis from multiple purchases at different prices.

Calculate intrinsic value of call and put options.

Calculate breakeven prices for option trades.

Calculate current yield and approximate yield to maturity for bonds.

Calculate weighted portfolio returns and risk metrics.

Calculate mortgage and loan monthly payments using the standard amortization formula.

Calculate the lifetime interest cost on a loan.

Calculate time and interest saved by making extra payments on loans.

Calculate break-even month and savings when refinancing a loan.

Break down loan payments into interest and principal components.

Calculate effective annual rate from nominal rate and compounding frequency.

Calculate tips, split bills, and figure out your share. No phone allowed.

Calculate your fair share when dining with others. Tax, tip, and shared items.

Calculate monthly car loan payments with interest.

Calculate electric, gas, and water bills from usage rates and tiered pricing.

Compare monthly vs annual plans, bundle costs, and family plan savings.

Calculate federal income tax using 2024 US tax brackets.

Calculate take-home pay from gross salary after taxes and deductions.

Calculate sales tax on vehicle purchases.

Convert hourly wages to annual salary with overtime, benefits, and deductions.

Compare total costs across different tax rates and categories.

Multiple discounts, coupons, and BOGO deals. How much do you actually pay?

Compare total costs of leasing versus buying a vehicle.

Compare unit prices across package sizes to find the best deal.

Stack percentage and dollar-off coupons. Order matters!

Calculate credit card cashback on categorized spending.

Calculate how much each mile costs in fuel. Know your true driving expenses.

Calculate fuel costs for road trips. Plan your budget before you drive.

Calculate your real fuel efficiency from actual trip data.

Calculate how far you can drive on a tank of gas.

Calculate the cost to fill your tank at the gas pump.

Compare annual fuel costs between electric and gas vehicles.

Calculate electric vehicle driving range from battery and efficiency.

Calculate the cost to charge an electric vehicle at home or on the road.

Calculate how long it takes to charge an electric vehicle.

Calculate battery capacity loss over time and charge cycles.

Calculate how much a vehicle loses in value over time.

Calculate the true 5-year cost of owning a vehicle.

Calculate the annualized cost of owning a vehicle.

Calculate annual vehicle insurance premiums with various factors.

Calculate monthly vehicle lease payments with various terms.

Convert between cm, m, km, inches, feet, yards, and miles.

Convert lengths through multiple units in sequence.

Solve real-world length conversion word problems.

Compare two lengths in different units and find the difference.

Estimate length measurements using real-world references.

Convert between grams, kilograms, ounces, and pounds.

Convert masses through multiple units in sequence.

Solve real-world mass conversion word problems.

Compare two masses in different units and find the difference.

Estimate mass measurements using real-world references.

Convert between mL, liters, fluid ounces, cups, pints, quarts, and gallons.

Convert volumes through multiple units in sequence.

Solve real-world volume conversion word problems.

Compare two volumes expressed in different units.

Estimate volumes using real-world references.

Convert between m/s, km/h, mph, and ft/s.

Convert speeds through multiple units in sequence.

Solve real-world speed conversion word problems.

Compare two speeds expressed in different units.

Estimate speeds using real-world references.

Convert between seconds, minutes, hours, days, and weeks.

Convert time through multiple units in sequence.

Solve real-world time conversion word problems.

Compare two time durations expressed in different units.

Estimate time durations using real-world references.

Convert between Celsius and Fahrenheit.

Convert temperature through multiple scales in sequence.

Solve real-world temperature conversion word problems.

Compare two temperatures expressed in different scales.

Estimate temperatures using real-world references.

Convert between all unit types: length, mass, volume, speed, time, and temperature.

Multi-step conversions across all unit types.

Word problems from all unit categories.

Compare quantities from any unit category.

Estimation challenges from any unit category.

Calculate batting average, OBP, slugging, OPS, and more from realistic stat lines.

Calculate ERA, WHIP, K/9, and more from realistic pitching lines.

Calculate fielding percentage, range factor, and more from realistic fielding stats.

Calculate stolen base rates, runs created, and baserunning metrics.

Calculate WHIP, ERA, K/9, BB/9, and advanced pitching metrics from season stats.

Mixed baseball stats from batting, pitching, fielding, baserunning, and sabermetrics.

Calculate FG%, TS%, eFG%, fantasy points, and more from realistic box scores.

Calculate 2P%, 3P%, FT%, points per shot, eFG%, and TS% from shooting splits.

Calculate usage rate, game score, and per-36 stats from advanced box scores.

Calculate ORB%, DRB%, rebound rate, and per-game rebounding stats.

Calculate assist/turnover ratio, assist rate, and playmaking metrics.

Mixed basketball stats from shooting, advanced, rebounding, playmaking, and more.

Calculate completion percentage, passer rating, and more from realistic QB stat lines.

Calculate yards per carry, fantasy points, and more from realistic RB stat lines.

Calculate catch rate, yards per reception, PPR fantasy points, and more from realistic WR/TE stat lines.

Calculate tackle rate, sack rate, INT rate, and QB pressure percentage from defensive stat lines.

Calculate field goal percentage, punt average, return average, and touchback rate from special teams stats.

Mixed American football calculations across passing, rushing, receiving, defense, and special teams.

Calculate batting average, strike rate, and more from realistic cricket batting stats.

Calculate economy rate, bowling average, and more from realistic bowling figures.

Calculate catch success rate, run-out efficiency, and stumping rate from fielding stats.

Calculate economy rate, dot ball percentage, and maiden over rate from bowling economy stats.

Calculate all-rounder index, batting-bowling ratio, and combined batting+bowling value.

Mixed cricket calculations across batting, bowling, fielding, economy, and all-rounder stats.

Calculate first serve percentage, break points, and more from realistic match statistics.

Calculate ace percentage, double fault rate, serve win percentages, and hold rates.

Calculate return games won, break point conversion, and return point statistics.

Calculate winners/UE ratio, net approach success, and aggression metrics.

Calculate sets won, tiebreak win rate, deciding set records, and match efficiency stats.

Mixed tennis statistics from serving, returning, rally, match efficiency, and general match stats.

Calculate goals per game, shot accuracy, xG difference, and more from realistic season stats.

Calculate save percentage, goals against average, clean sheet rate, and more.

Calculate tackle success, interceptions per 90, aerial duels, and defensive action rates.

Calculate pass completion, progressive passes per 90, key passes, and carrying stats.

Calculate shot conversion, xG overperformance, chances created per 90, and goal involvement.

Mixed soccer statistics from attacking, defending, goalkeeping, possession, and general stats.

Calculate scoring average, GIR percentage, scrambling, and more from realistic tournament stats.

Calculate scoring average, par averages, birdie percentage, and bogey avoidance from tournament data.

Calculate driving accuracy, average distance, fairway hit rate, and distance differential.

Calculate putts per GIR, 1-putt percentage, 3-putt percentage, and total putts per round.

Calculate GIR percentage, proximity to hole, sand save percentage, and up-and-down rate.

Mixed golf calculations from stats, scoring, driving, putting, and approach games.

Calculate goals per game, shooting percentage, save percentage, GAA, Corsi, and PDO from realistic stat lines.

Calculate points per game, even-strength production, power play percentage, and shooting percentage.

Calculate GAA, save percentage, shutout rate, and quality start percentage from goalie stats.

Calculate Corsi%, Fenwick%, zone start%, and PDO from advanced hockey stats.

Calculate power play%, penalty kill%, shorthanded goals/60, and 5v5 goal differential.

Mixed hockey calculations from stats, scoring, goaltending, possession, and special teams.

Calculate win rate, average finish, pole-to-win conversion, and more from realistic motorsport stat lines.

Calculate qualifying deltas, lockout rates, and position averages from realistic qualifying data.

Calculate average lap times, pit stop deltas, tire degradation rates, and more from realistic race data.

Calculate points projections, constructor totals, and championship gaps from realistic standing data.

Calculate optimal pit windows, undercut/overcut deltas, and strategy comparisons from realistic race data.

Mixed motorsport calculations from all sub-categories: stats, qualifying, race pace, championship, and pit strategy.

Calculate win rate, KO rate, striking accuracy, takedown accuracy, and more from realistic MMA stat lines.

Calculate striking accuracy, absorbed strikes per minute, and strike differential from realistic MMA data.

Calculate takedown accuracy, submission rate, and control time percentage from realistic MMA grappling data.

Calculate 10-point must scoring, split decisions, and judge totals from realistic MMA judging data.

Calculate win percentage, finish rate, average fight time, and KO rate from realistic fighter records.

Mixed combat sports calculations from all sub-categories: stats, striking, grappling, judging, and record.

Given an element name or symbol, type its atomic number

Given an element, type its atomic mass

Count electrons in a specific shell or subshell

How many valence electrons does this element have?

What is the most common oxidation state of this element?

Mixed periodic table questions

Calculate the molar mass of a compound

Calculate pH from hydrogen ion concentration

Calculate solution concentration from mass, molar mass, and volume

Calculate molar ratios from balanced equations

Boyle's, Charles's, Combined, and Ideal gas law

Mixed chemistry calculations

Solve motion equations: velocity, displacement, and acceleration

Calculate forces using Newton's laws

Calculate kinetic energy, potential energy, and work

Calculate gravitational forces and field strength

Momentum, impulse, and collision calculations

Mixed mechanics calculations: kinematics, forces, energy, gravity, and momentum

Calculate wave speed, frequency, and wavelength

Solve electrical circuits using Ohm's law and resistance networks

Calculate sound intensity levels in decibels

Thin lens equation and magnification calculations

LC circuits, pipe harmonics, and standing waves

Mixed wave, circuit, sound, lens, and resonance calculations

Recall fundamental physics constants

Applications of the speed of light (c = 3×10⁸ m/s)

Ideal gas law PV = nRT applications

Gravitational force and orbital mechanics using G

E=hf, photoelectric effect, and de Broglie wavelength

Mixed physics constants: recall, speed of light, gas law, gravity, and Planck