Free online calculators for everyday life
Everyday math, done properlyThe answer, before you finish typing. A calm set of 100+ calculators for money, math, health, home and dates, no sign-up, no clutter, no waiting, they run the moment you type.
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.
Nothing to sign up for
No account, no email wall, no cookie banner theatre. Open a tool, get your answer, close the tab.
Your numbers stay yours
Everything runs on your device. We never see the bill you split or the loan you're weighing up.
Prefer a physical calculator?
A few solid picks. As an Amazon Associate, Calculate.to earns from qualifying purchases, at no extra cost to you.
OSALO Desktop Calculator
Extra-large 12-digit LCD, giant buttons, solar + battery, the classic office desk workhorse.
View on Amazon →
Helix Oxford Scientific
240-function scientific calculator for KS3–KS4 maths, with hard cover. Exam-friendly, plastic-free packaging.
View on Amazon →
Casio fx-83GTCW+
The UK classroom-standard scientific calculator (also in pink), allowed in most UK exams.
View on Amazon →
ROATEE Construction Calc
Feet-inch-fraction engineering calculator for carpenters, framers and contractors on site.
View on Amazon →
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 gold ⇄Gold-silverOunces of silver ‰Real rateAfter inflationInvesting
▲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 shortcut ↗DCAInvest monthly, compoundLoans & debt
⌂MortgageFull monthly payment ≈Loan paymentMonthly cost & interest ⚙Car loanWith down & trade-in ✂Debt payoffSnowball vs avalanche ·Simple interestI = P·r·t ⇄APR ↔ APYCompounding conversions $AmortizationPayment and interestEveryday 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 time ¤Unit priceBetter-deal per unitHealth & 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 hydration ◔Waist-to-heightA simple health markerFitness & sleep
⏵Running pacePace, time, distance ⚑One-rep maxEpley & Brzycki ❤Heart-rate zonesTraining zones ☾Sleep cyclesWhen to sleep or wake △Calories burnedAny workoutDates & 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 cities ▤Business daysWeekdays between datesMath & numbers
÷FractionFour ops, simplified √ScientificFull keypad x̄AverageMean, median, std dev ::RatioSolve & simplify a:b ∧GCF & LCMFactors & multiples 01Binary / hexDec, bin, hex, octal f(x)AdvancedVariables, solve, plot ∂DerivativeSlope at a point ∫IntegralArea under a curve AIAI computeFLOPs, GPU-hours, cost ψQuantumQubits & overhead σStd deviationSample and population ƒQuadraticRoots and vertex ⅯRoman numeralsNumbers to RomanSchool
☆GPAWeighted 4.0 scale ✓Final gradeWhat you need on the final %Test scorePercent and letter ΣWeighted gradeBy weight per taskConverters
°Temperature°C, °F and kelvin ↔Lengthmm to miles ⚖WeightGrams to tons & stone ☕Cups to gramsReal ingredient densities →Speedmph, km/h, knots ▦AreaAcres, hectares, sq ft ◍VolumeLitres, gallons, cupsKitchen
×Recipe scalerResize any recipe ▢Pan conversionSwap baking pans ☕Coffee ratioWater, beans, strength ◓Oven tempC, F, gas, fanHome & garden
▤Square footageArea & cost per sq ft ▧ConcreteVolume & bags ▨PaintCoverage & cans ▥FlooringBoxes with waste ✿MulchCubic yards & bags ▧TileCount plus wasteCommon questions about Calculate.to
Are the calculators on Calculate.to 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.