The answer,
before you finish typing.
A calm set of everyday calculators — percentages, tips, loans, dates and more. No sign-up, no clutter, no waiting. They run the moment you type.
What does a Fed rate cut actually do?
Follow a single rate cut as it ripples through your loans, your savings, the money supply and asset prices — live and interactive.
Open the Rate Cut Ripple →M2 money supply
Growth, doubling time, and what expansion does to fixed cash.
Open → ◆Gold vs USD
The dollar's value in gold since 1971 — or any year.
Open → ▲S&P 500 since inception
Invest every year since 1928 — with real annual returns.
Open → №1S&P 1 vs S&P 500
Only ever buying the biggest company — versus the index.
Open →Every calculator, one tap away
Grouped by what you're actually trying to work out. Each one opens instantly and remembers nothing — your numbers stay on your device.
Instruments, not forms
Answers as you type
No "calculate" button to hunt for. Every field is live, so the result moves the instant a number does.
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Your numbers stay yours
Everything runs on your device. We never see the bill you split or the loan you're weighing up.
Every calculator on the site
Money & the Fed
↓Fed rate cutOne cut, four ripples $M2 money supplyGrowth, doubling, dilution ◆Gold vs USDThe dollar since 1971 ▴InflationDollar value, 1913–2025 ⚖Gold / M2 ratioIs gold cheap vs money? ⚔Dow-to-GoldStocks priced in goldInvesting
▲S&P 500 since inceptionReal returns 1928–2025 №1S&P 1 vs S&P 500Throne vs kingdom ↗CAGRCompound annual growth ♻Dividend reinvestmentDRIP compounding ⌂Retirement / FIRENest egg & the 4% rule ±ROIReturn on investment 72Rule of 72Doubling time shortcutLoans & debt
⌂MortgageFull monthly payment ≈Loan paymentMonthly cost & interest ⚙Car loanWith down & trade-in ✂Debt payoffSnowball vs avalanche ·Simple interestI = P·r·t ⇄APR ↔ APYCompounding conversionsEveryday money
%PercentageOf, change, add & subtract $Tip & splitTip and divide the bill ◷VAT / sales taxAdd or remove tax ✂DiscountSale price & savings ◨Margin & markupPrice, cost, profit ⏱Salary ↔ hourlyPay, converted both ways ◎Savings goalTime or monthly needed ↔Currency21 major currencies △Compound interestGrowth over timeHealth & body
◐BMIWith healthy range ⊙Calorie needsMifflin–St Jeor ⚡TDEETotal daily energy ☀BMRCalories at rest ◑Body fat %US Navy method ⚕Ideal weightFour classic formulas ◲MacrosProtein, carbs, fat split ≋Water intakeDaily hydrationFitness & sleep
⏵Running pacePace, time, distance ⚑One-rep maxEpley & Brzycki ❤Heart-rate zonesTraining zones ☾Sleep cyclesWhen to sleep or wakeDates & time
◔AgeYears, months, days ▦Date differenceDays & working days □Day of the weekWhat day was any date ⇢Days from todayAdd days & business days ⏰Time & hoursDurations & work hours ⏲Time zonesDifference between citiesMath & numbers
÷FractionFour ops, simplified √ScientificFull keypad x̄AverageMean, median, std dev ::RatioSolve & simplify a:b ∧GCF & LCMFactors & multiples 01Binary / hexDec, bin, hex, octalConverters
°Temperature°C, °F and kelvin ↔Lengthmm to miles ⚖WeightGrams to tons & stone ☕Cups to gramsReal ingredient densitiesKitchen
×Recipe scalerResize any recipe ▢Pan conversionSwap baking pans ☕Coffee ratioWater, beans, strengthCommon questions about Calculate
Are the calculators on Calculate really free?
Yes — every calculator is completely free with no ads, no accounts and no locked features. The site is supported by optional donations only.
How accurate are the results?
Every tool is verified against known benchmarks before publishing — loan math against standard amortization tables, inflation against official BLS CPI data, health formulas against their original published equations. Where a result is an estimate, the page says so plainly.
Is my data private?
Completely. Calculations run entirely in your browser using JavaScript — the numbers you type never leave your device, and the site uses no cookies or tracking.
Do the calculators work on mobile?
Yes — every page is built for phones first and works instantly in any modern browser, with no app or sign-up required.