OUR IDEA
Math isn’t just for math people.
Most of the math that trips people up isn’t hard. It’s just never explained. Lay Math shows the answer and the reason, in words anyone can follow.
Why we built it
People call it complex math. To a mathematician it’s “lay math” — simple steps that nobody walked you through. A 50% markup isn’t a 50% margin. Two discounts don’t add up. A 1:4 mix isn’t 25%. We want you to see that with your own numbers, not take our word for it.
How every calculator works
- Live. Change a figure and the answer moves immediately.
- Shown, not hidden. “Show me why” lays out each step of the math.
- Yours. Every figure is a starting point you replace with your own.
- Global. 47 currencies, metric or imperial, and no assumptions about your country.
- Private. Everything runs in your browser. Nothing is stored or sent.
What’s inside — 65 calculators
BusinessProfit, Cash flow, Free cash flow, Project time, Recurring revenue, Business valuation, Price / earnings, Net asset value, IPO raise, Dilution, Inventory turnoverMoney & accountingMargin & markup, Break-even, Net salary, Pro-rated pay, Taxable income, Tax brackets, Loan, Mortgage payoff, Buy vs lease, Interest, Inflation, Investment, Retirement, Currency conversion, DepreciationPersonalPersonal net worth, Event cost, Degree costUpkeepRaising a child, Pet care, Car upkeep, Home upkeepEverydayEveryday %, Unit price, Recipe scaling, Split the bill, Clothing sizes, Shoe sizes, 24-hour clock, Time zones, BMI, 10,000 hours, 10,000 steps, Car servicingTrades & healthInches & mm, Area & volume, Material & waste, Mixing ratios, Dose by weightData & designWeighted average, Mean vs median, Rare-disease test, Margin of error, Aspect ratio, Square-cube lawScienceTemperature, Speed, Density, Ohm’s law, Electricity cost, Kinetic energySafetyStopping distance, Following distance, Ladder angle
Where to find us
Lay Math lives at laymath.app. The addresses laymath.com, ceomath.com, arrmath.com, mrrmath.com, ipomath.com and navmath.com also bring you here. Questions? The Help centre has the answers.