Recipe Scaler
Adjust ingredient amounts for a different number of servings.
Calculators & ConvertersCalculators & Converters
Work with fractions and geometry, convert units, compare money scenarios, and estimate materials for home projects.
Cooking Unit Converter
Find your way between cups, grams, ounces, and more.
Calculators & ConvertersPPI Calculator
Work out pixel density from screen size and resolution.
Calculators & ConvertersAspect Ratio Calculator
Get the right proportions for your next image or video.
Calculators & ConvertersDownload Time Calculator
Find out how long that file transfer could take.
Calculators & ConvertersUptime Calculator
Turn availability percentages into a clear downtime budget.
Calculators & ConvertersScreen Resolution Checker
Check viewport dimensions, screen size, and pixel ratio.
Calculators & ConvertersPercentage Calculator
Find parts, rates, whole amounts, and percentage adjustments.
Calculators & ConvertersPercentage Change Calculator
Compare increases, decreases, multipliers, and reverse changes.
Calculators & ConvertersFraction Calculator
Calculate exact fractions and mixed numbers with reduced answers.
Calculators & ConvertersRatio Calculator
Reduce decimal ratios and divide a total into exact shares.
Calculators & ConvertersAverage Calculator
Calculate mean, median, modes, sum, and range from a number list.
Calculators & ConvertersWeighted Average Calculator
Combine values with relative weights and inspect each contribution.
Calculators & ConvertersRounding Calculator
Round exact decimal input with five explicit rounding rules.
Calculators & ConvertersScientific Notation Converter
Convert decimal, scientific, engineering, and e notation.
Calculators & ConvertersSignificant Figures Calculator
Count significant digits and round to a selected figure count.
Calculators & ConvertersNumber Base Converter
Convert large signed integers exactly between bases 2 through 36.
Calculators & ConvertersPrime Number Checker
Check an integer for primality and see its smallest prime divisor when it is composite.
Calculators & ConvertersPrime Factorization Calculator
Factor an integer into prime powers and count its positive divisors using exact arithmetic.
Calculators & ConvertersGCD and LCM Calculator
Find the greatest common divisor and least common multiple of 2–30 signed integers with exact steps.
Calculators & ConvertersQuadratic Equation Solver
Solve ax² + bx + c = 0, including real, repeated, complex, linear, and degenerate cases.
Calculators & ConvertersLinear Equation Solver
Solve two- or three-variable linear systems and identify unique, inconsistent, or dependent systems.
Calculators & ConvertersPolynomial Calculator
Add, subtract, multiply, differentiate, or evaluate polynomials from descending coefficient lists.
Calculators & ConvertersMatrix Calculator
Add, subtract, multiply, transpose, invert, or find determinants of matrices up to 5 × 5.
Calculators & ConvertersStandard Deviation Calculator
Calculate sample or population standard deviation, variance, mean, median, and range endpoints.
Calculators & ConvertersProbability Calculator
Calculate equally likely event chances, independent event combinations, and binomial probabilities.
Calculators & ConvertersCombinations and Permutations Calculator
Count ordered arrangements or unordered selections, with optional repetition and exact large-integer results.
Calculators & ConvertersLength Converter
Convert metric, US, and UK lengths and combine feet and inches.
Calculators & ConvertersArea Converter
Convert square units, acres, and hectares, or calculate a rectangle or circle.
Calculators & ConvertersVolume Converter
Convert liters, cubic units, and explicitly defined US and Imperial gallons and pints.
Calculators & ConvertersWeight Converter
Convert mass between kilograms, pounds, ounces, stone, and clearly defined tons.
Calculators & ConvertersTemperature Converter
Convert Celsius, Fahrenheit, kelvin, and Rankine, including temperature differences.
Calculators & ConvertersSpeed Converter
Convert mph, km/h, knots, and m/s, or turn running pace into speed.
Calculators & ConvertersPressure Converter
Convert Pa, kPa, bar, psi, atm, and torr, and relate gauge and absolute pressure.
Calculators & ConvertersEnergy Converter
Convert joules, kWh, calories, Btu IT, and foot-pounds, or calculate appliance energy.
Calculators & ConvertersPower Converter
Convert watts, horsepower definitions, and Btu/h, or find average power from energy and time.
Calculators & ConvertersForce Converter
Convert newtons, pounds-force, kilogram-force, and defined ton-forces; calculate mass times gravity.
Calculators & ConvertersData Storage Converter
Convert bits, bytes, and decimal or binary storage units.
Calculators & ConvertersData Rate Converter
Compare bit and byte rates and estimate transfer time.
Calculators & ConvertersFrequency Converter
Convert Hz, rpm, and angular frequency with cycle timing.
Calculators & ConvertersAngle Converter
Convert angle units and inspect equivalent directions.
Calculators & ConvertersTime Unit Converter
Convert fixed durations and break them into readable parts.
Calculators & ConvertersFuel Economy Converter
Compare US mpg, Imperial mpg, and fuel consumption.
Calculators & ConvertersTorque Converter
Convert torque units and estimate force at a lever arm.
Calculators & ConvertersAcceleration Converter
Compare acceleration units and estimate velocity change.
Calculators & ConvertersDensity Converter
Convert mass density and calculate mass for a sample.
Calculators & ConvertersFlow Rate Converter
Convert volume flow and estimate collected volume.
Calculators & ConvertersTriangle Calculator
Solve a triangle from SSS, SAS, or two angles and a side. Find all sides, angles, area, perimeter, altitude, inradius, and circumradius.
Calculators & ConvertersRight Triangle Calculator
Find missing legs, hypotenuse, acute angles, area, perimeter, altitude, and inradius of a right triangle from three supported input modes.
Calculators & ConvertersCircle Calculator
Calculate circle area, circumference, radius, and diameter from any one known measurement, with a diagram, formulas, and text export.
Calculators & ConvertersSphere Calculator
Calculate sphere volume, surface area, radius, diameter, and great-circle area from a radius, diameter, volume, or surface measurement.
Calculators & ConvertersCylinder Calculator
Find right-cylinder volume, radius, base area, curved surface, closed surface, and open-top surface from radius, diameter, or volume plus height.
Calculators & ConvertersCone Calculator
Calculate cone volume, slant height, perpendicular height, base area, and lateral or total surface from radius and height, slant height, or volume.
Calculators & ConvertersRectangle Calculator
Calculate rectangle area, perimeter, diagonal, and missing height from width and height, diagonal, area, or perimeter, with a proportional diagram.
Calculators & ConvertersTrapezoid Calculator
Calculate trapezoid area, perimeter, legs, and midline from parallel bases, perpendicular height, and horizontal offset, or use centered isosceles mode.
Calculators & ConvertersRegular Polygon Calculator
Calculate a regular polygon’s area, perimeter, apothem, circumradius, side length, angles, and diagonal count for 3 to 1,000 sides.
Calculators & ConvertersCoordinate Distance Calculator
Calculate straight-line distance, midpoint, coordinate differences, and squared distance between Cartesian points in 2D or 3D, with an XY diagram.
Calculators & ConvertersPaint Calculator
Estimate paint gallons or liters, whole containers and material cost from wall dimensions, coats, openings and your paint label coverage.
Calculators & ConvertersWallpaper Calculator
Calculate wallpaper rolls from full-height drops, actual roll dimensions, trim, straight pattern repeat and an editable extra allowance.
Calculators & ConvertersTile Calculator
Estimate floor or wall tile quantities, whole boxes, waste and material cost from actual tile dimensions and measured surface area.
Calculators & ConvertersFlooring Calculator
Calculate flooring packs, cutting allowance, purchased coverage and material cost for rectangular, circular or ring-shaped floor areas.
Calculators & ConvertersConcrete Calculator
Estimate concrete bags by mixed yield, cubic yards or meters, and rounded bulk orders for solid slabs and cylinders.
Calculators & ConvertersGravel Calculator
Estimate gravel bags, cubic yards or meters, and tons from ground shape, layer depth, allowance and supplier-entered bulk density.
Calculators & ConvertersMulch Calculator
Calculate mulch bags and bulk volume for beds and tree rings, with new-layer depth, exclusions and optional bag-versus-bulk cost.
Calculators & ConvertersSoil Calculator
Calculate soil bags or bulk fill from internal raised-bed dimensions, target and existing depths, bed count and settlement allowance.
Calculators & ConvertersDecking Calculator
Estimate straight decking stock boards from board direction, actual face width, side gaps, stock length and spare allowance.
Calculators & ConvertersWall Stud Calculator
Count wall stud pieces, manual framing extras and stock lumber for identical straight sections using user-specified on-center spacing.
Calculators & ConvertersLoan Calculator
Calculate a fixed monthly loan payment, total interest, and a downloadable month-by-month repayment schedule.
Calculators & ConvertersAmortization Calculator
Compare standard loan amortization with extra monthly principal payments, interest savings, and a CSV schedule.
Calculators & ConvertersSavings Goal Calculator
Find the monthly deposit needed for a savings target, with contribution timing, zero-rate handling, and a CSV schedule.
Calculators & ConvertersCompound Interest Calculator
Project compound growth with monthly contributions, compounding frequency, deposit timing, and a downloadable balance schedule.
Calculators & ConvertersSimple Interest Calculator
Solve simple interest, principal, annual rate, or elapsed time, with optional 360- or 365-day year conventions.
Calculators & ConvertersCredit Card Payoff Calculator
Estimate payoff months and interest for a fixed card payment, or find the payment for a chosen payoff target.
Calculators & ConvertersDebt Payoff Calculator
Compare avalanche and snowball debt payoff scenarios with fixed minimums, rolled-over payments, milestones, and CSV exports.
Calculators & ConvertersSavings Withdrawal Calculator
Simulate monthly savings withdrawals, yearly increases, growth or losses, and depletion within a chosen horizon.
Calculators & ConvertersInvestment Return Calculator
Calculate total, annualized, and inflation-adjusted investment returns from initial value, ending value, income, and fees.
Calculators & ConvertersInflation Calculator
Project inflation effects with a chosen rate or compare user-supplied price indexes to calculate equivalent cost and purchasing power.
Calculators & ConvertersSales Tax Calculator
Add or extract entered sales tax with a reconciled receipt breakdown.
Calculators & ConvertersDiscount Calculator
Compare stacked discounts, coupon order and a final tax scenario.
Calculators & ConvertersTip Calculator
Choose a tip base, round up and divide the final bill exactly.
Calculators & ConvertersSplit Bill Calculator
Split item totals or weighted shares with exact penny allocation.
Calculators & ConvertersProfit Margin Calculator
Compare gross margin, operating margin and target revenue.
Calculators & ConvertersMarkup Calculator
Price from markup or margin and see actual unit profit.
Calculators & ConvertersBreak-Even Calculator
Compare break-even units and profit targets with sales capacity.
Calculators & ConvertersUnit Price Calculator
Compare package sizes and multipacks in compatible units.
Calculators & ConvertersCommission Calculator
Model flat or marginal commission, base pay and a threshold bonus.
Calculators & ConvertersFreelance Rate Calculator
Estimate rates from income goals and realistic billable capacity.
Calculators & ConvertersAge Calculator
Find calendar age, total days, and the next birthday with a leap-day policy.
Calculators & Converters