Math & Conversion calculators
Percentages, fractions, trig, and every unit converted with the math shown. Every tool shows its formula, updates live, and works on any device.
Saved & recent
- Acres to Hectares ConverterConvert acres to hectares instantly. Exact factor: 1 acres = 0.40469 ha.→
- Advanced Math CalculatorThe math past the basics in one dropdown: triangle solvers (SSS, SAS, ASA), law of sines and cosines, determinants, inverses and matrix products, vector dot and cross products, arithmetic and geometric series, Fibonacci, base conversion, Roman numerals, two’s complement, bitwise logic, complex numbers, and polar coordinates.→
- Angle ConverterConvert Degrees, radians, gradians, and turns for geometry and navigation. Live conversion with the exact factor or formula shown.→
- Area ConverterConvert Square feet and meters, acres, hectares, and square miles. Live conversion with the exact factor or formula shown.→
- Atmospheres to Bar ConverterConvert atmospheres to bar instantly. Exact factor: 1 atm = 1.013 bar.→
- Bar to Kilopascals ConverterConvert bar to kilopascals instantly. Exact factor: 1 bar = 100 kPa.→
- Bar to Pounds/sq inch ConverterConvert bar to pounds/sq inch instantly. Exact factor: 1 bar = 14.504 psi.→
- BTU to Kilowatt-hours ConverterConvert btu to kilowatt-hours instantly. Exact factor: 1 BTU = 0.0002931 kWh.→
- BTU/hour to Kilowatts ConverterConvert btu/hour to kilowatts instantly. Exact factor: 1 BTUh = 0.0002931 kW.→
- Bushels (US) to Pecks (US) ConverterConvert bushels (us) to pecks (us) instantly. Exact factor: 1 bu = 4 pk.→
- Butter ConverterConvert Sticks of butter against tablespoons, teaspoons, cups, grams, ounces, and pounds. Live conversion with the exact factor or formula shown.→
- Capacitance ConverterConvert Farads with their electronics submultiples: pF, nF, µF, and mF. Live conversion with the exact factor or formula shown.→
- Celsius to Fahrenheit ConverterConvert celsius to fahrenheit instantly. Exact formula shown with the result.→
- Celsius to Kelvin ConverterConvert celsius to kelvin instantly. Exact formula shown with the result.→
- Centimeters to Feet ConverterConvert centimeters to feet instantly. Exact factor: 1 cm = 0.03281 ft.→
- Centimeters to Inches ConverterConvert centimeters to inches instantly. Exact factor: 1 cm = 0.3937 in.→
- Cups (US) to Fluid ounces (US) ConverterConvert cups (us) to fluid ounces (us) instantly. Exact factor: 1 cup = 8 fl oz.→
- Cups (US) to Milliliters ConverterConvert cups (us) to milliliters instantly. Exact factor: 1 cup = 236.6 mL.→
- Cups to Grams ConverterConvert cups to grams instantly. Exact factor: 1 cup = 226.8 g.→
- Data Storage ConverterConvert Decimal (KB, MB, GB) and binary (KiB, MiB, GiB) byte units side by side. Live conversion with the exact factor or formula shown.→
- Degrees to Radians ConverterConvert degrees to radians instantly. Exact factor: 1 ° = 0.01745 rad.→
- Density ConverterConvert kg/m³, g/cm³, and lb/ft³ for materials and fluids. Live conversion with the exact factor or formula shown.→
- Discount CalculatorSale price in one pass: percent off, a fixed amount off, a stacked extra discount, and sales tax — final price, every deduction, and the total savings shown.→
- Dry quarts (US) to Liters ConverterConvert dry quarts (us) to liters instantly. Exact factor: 1 dry qt = 1.101 L.→
- Energy ConverterConvert Joules, calories, kWh, and BTU for food, heating, and electricity. Live conversion with the exact factor or formula shown.→
- Fahrenheit to Celsius ConverterConvert fahrenheit to celsius instantly. Exact formula shown with the result.→
- Fahrenheit to Kelvin ConverterConvert fahrenheit to kelvin instantly. Exact formula shown with the result.→
- Farads to Microfarads ConverterConvert farads to microfarads instantly. Exact factor: 1 F = 1,000,000 µF.→
- Feet to Centimeters ConverterConvert feet to centimeters instantly. Exact factor: 1 ft = 30.48 cm.→
- Feet to Meters ConverterConvert feet to meters instantly. Exact factor: 1 ft = 0.3048 m.→
- Flow Rate ConverterConvert Liters per minute, gallons per minute, CFM, and cubic meters per hour. Live conversion with the exact factor or formula shown.→
- Fluid ounces (US) to Milliliters ConverterConvert fluid ounces (us) to milliliters instantly. Exact factor: 1 fl oz = 29.574 mL.→
- Force ConverterConvert Newtons, kilogram-force, and pounds-force. Live conversion with the exact factor or formula shown.→
- Fraction CalculatorAdd, subtract, multiply, or divide any two fractions and see the work: common denominators, GCD simplification to lowest terms, mixed numbers, and decimals.→
- Frequency ConverterConvert Hertz, kilohertz, RPM, and radians per second. Live conversion with the exact factor or formula shown.→
- ft³/min to L/s ConverterConvert ft³/min to l/s instantly. Exact factor: 1 cfm = 0.47195 Ls.→
- Fuel Economy ConverterConvert Miles per gallon and liters per 100 km, converted the reciprocal way. Live conversion with the exact factor or formula shown.→
- g/cm³ to kg/m³ ConverterConvert g/cm³ to kg/m³ instantly. Exact factor: 1 gcm3 = 1,000 kgm3.→
- g/cm³ to lb/ft³ ConverterConvert g/cm³ to lb/ft³ instantly. Exact factor: 1 gcm3 = 62.428 lbft3.→
- Gallons (imperial) to Liters ConverterConvert gallons (imperial) to liters instantly. Exact factor: 1 imp gal = 4.546 L.→
- Gallons (US) to Liters ConverterConvert gallons (us) to liters instantly. Exact factor: 1 gal = 3.785 L.→
- Gallons/min (US) to L/min ConverterConvert gallons/min (us) to l/min instantly. Exact factor: 1 gpm = 3.785 Lmin.→
- Gibibytes to Gigabytes ConverterConvert gibibytes to gigabytes instantly. Exact factor: 1 GiB = 1.074 GB.→
- Gigabytes to Gibibytes ConverterConvert gigabytes to gibibytes instantly. Exact factor: 1 GB = 0.93132 GiB.→
- Gigabytes to Mebibytes ConverterConvert gigabytes to mebibytes instantly. Exact factor: 1 GB = 953.7 MiB.→
- Gigabytes to Terabytes ConverterConvert gigabytes to terabytes instantly. Exact factor: 1 GB = 0.001 TB.→
- Gigahertz to Megahertz ConverterConvert gigahertz to megahertz instantly. Exact factor: 1 GHz = 1,000 MHz.→
- Gradians to Degrees ConverterConvert gradians to degrees instantly. Exact factor: 1 grad = 0.9 °.→
- Grams to Ounces ConverterConvert grams to ounces instantly. Exact factor: 1 g = 0.03527 oz.→
- Hectares to Acres ConverterConvert hectares to acres instantly. Exact factor: 1 ha = 2.471 acres.→
- Henries to Millihenries ConverterConvert henries to millihenries instantly. Exact factor: 1 H = 1,000 mH.→
- Hertz to Revolutions/min ConverterConvert hertz to revolutions/min instantly. Exact factor: 1 Hz = 60 rpm.→
- Horsepower (mech) to Horsepower (metric) ConverterConvert horsepower (mech) to horsepower (metric) instantly. Exact factor: 1 hp = 1.014 hpm.→
- Horsepower (mech) to Kilowatts ConverterConvert horsepower (mech) to kilowatts instantly. Exact factor: 1 hp = 0.7457 kW.→
- Illuminance ConverterConvert Lux, foot-candles, phots, and nox for lighting design and photography. Live conversion with the exact factor or formula shown.→
- Inches to Centimeters ConverterConvert inches to centimeters instantly. Exact factor: 1 in = 2.54 cm.→
- Inches to Millimeters ConverterConvert inches to millimeters instantly. Exact factor: 1 in = 25.4 mm.→
- Inductance ConverterConvert Henries, millihenries, microhenries, and nanohenries for coils and chokes. Live conversion with the exact factor or formula shown.→
- Kelvin to Celsius ConverterConvert kelvin to celsius instantly. Exact formula shown with the result.→
- Kelvin to Fahrenheit ConverterConvert kelvin to fahrenheit instantly. Exact formula shown with the result.→
- kg/m³ to g/cm³ ConverterConvert kg/m³ to g/cm³ instantly. Exact factor: 1 kgm3 = 0.001 gcm3.→
- kg/m³ to lb/ft³ ConverterConvert kg/m³ to lb/ft³ instantly. Exact factor: 1 kgm3 = 0.06243 lbft3.→
- Kilobytes to Kibibytes ConverterConvert kilobytes to kibibytes instantly. Exact factor: 1 KB = 0.97656 KiB.→
- Kilocalories to Kilojoules ConverterConvert kilocalories to kilojoules instantly. Exact factor: 1 kcal = 4.184 kJ.→
- Kilogram-force meters to Pound-feet ConverterConvert kilogram-force meters to pound-feet instantly. Exact factor: 1 kgfm = 7.233 lbft.→
- Kilogram-force to Newtons ConverterConvert kilogram-force to newtons instantly. Exact factor: 1 kgf = 9.807 N.→
- Kilograms to Pounds ConverterConvert kilograms to pounds instantly. Exact factor: 1 kg = 2.205 lb.→
- Kilograms to Stones ConverterConvert kilograms to stones instantly. Exact factor: 1 kg = 0.15747 st.→
- Kilohertz to Megahertz ConverterConvert kilohertz to megahertz instantly. Exact factor: 1 kHz = 0.001 MHz.→
- Kilojoules to Kilocalories ConverterConvert kilojoules to kilocalories instantly. Exact factor: 1 kJ = 0.23901 kcal.→
- Kilometers to Miles ConverterConvert kilometers to miles instantly. Exact factor: 1 km = 0.62137 mi.→
- Kilometers/hour to Miles/hour ConverterConvert kilometers/hour to miles/hour instantly. Exact factor: 1 km/h = 0.62137 mph.→
- Kilonewtons to Pounds-force ConverterConvert kilonewtons to pounds-force instantly. Exact factor: 1 kN = 224.8 lbf.→
- Kilopascals to Pounds/sq inch ConverterConvert kilopascals to pounds/sq inch instantly. Exact factor: 1 kPa = 0.14504 psi.→
- Kilowatt-hours to Kilojoules ConverterConvert kilowatt-hours to kilojoules instantly. Exact factor: 1 kWh = 3,600 kJ.→
- Kilowatts to BTU/hour ConverterConvert kilowatts to btu/hour instantly. Exact factor: 1 kW = 3,412.1 BTUh.→
- Kilowatts to Horsepower (mech) ConverterConvert kilowatts to horsepower (mech) instantly. Exact factor: 1 kW = 1.341 hp.→
- Knots to Kilometers/hour ConverterConvert knots to kilometers/hour instantly. Exact factor: 1 kn = 1.852 km/h.→
- Knots to Miles/hour ConverterConvert knots to miles/hour instantly. Exact factor: 1 kn = 1.151 mph.→
- L/min to ft³/min ConverterConvert l/min to ft³/min instantly. Exact factor: 1 Lmin = 0.03531 cfm.→
- L/min to Gallons/min (US) ConverterConvert l/min to gallons/min (us) instantly. Exact factor: 1 Lmin = 0.26417 gpm.→
- lb/ft³ to kg/m³ ConverterConvert lb/ft³ to kg/m³ instantly. Exact factor: 1 lbft3 = 16.018 kgm3.→
- lb/ft³ to lb/in³ ConverterConvert lb/ft³ to lb/in³ instantly. Exact factor: 1 lbft3 = 0.0005787 lbin3.→
- Length ConverterConvert Metric and imperial distances: mm, cm, m, km, inches, feet, yards, miles. Live conversion with the exact factor or formula shown.→
- Liters per 100 km to Miles per gallon (US) ConverterConvert liters per 100 km to miles per gallon (us) instantly. Exact formula shown with the result.→
- Liters to Gallons (imperial) ConverterConvert liters to gallons (imperial) instantly. Exact factor: 1 L = 0.21997 imp gal.→
- Liters to Gallons (US) ConverterConvert liters to gallons (us) instantly. Exact factor: 1 L = 0.26417 gal.→
- Lux to Foot-candles ConverterConvert lux to foot-candles instantly. Exact factor: 1 lx = 0.0929 fc.→
- m³/hour to Gallons/min (US) ConverterConvert m³/hour to gallons/min (us) instantly. Exact factor: 1 m3h = 4.403 gpm.→
- Math CalculatorA complete math toolbox in one dropdown: GCD, LCM, primes and factorization, factorials, permutations and combinations, roots, logarithms, quadratic and linear solvers, ratios, weighted averages, list statistics, rounding and scientific notation.→
- Mebibytes to Gigabytes ConverterConvert mebibytes to gigabytes instantly. Exact factor: 1 MiB = 0.00105 GB.→
- Mebibytes to Megabytes ConverterConvert mebibytes to megabytes instantly. Exact factor: 1 MiB = 1.049 MB.→
- Megabytes to Mebibytes ConverterConvert megabytes to mebibytes instantly. Exact factor: 1 MB = 0.95367 MiB.→
- Megahertz to Gigahertz ConverterConvert megahertz to gigahertz instantly. Exact factor: 1 MHz = 0.001 GHz.→
- Meters to Feet ConverterConvert meters to feet instantly. Exact factor: 1 m = 3.281 ft.→
- Meters to Yards ConverterConvert meters to yards instantly. Exact factor: 1 m = 1.094 yd.→
- Meters/second to Miles/hour ConverterConvert meters/second to miles/hour instantly. Exact factor: 1 m/s = 2.237 mph.→
- Metric tons to US tons ConverterConvert metric tons to us tons instantly. Exact factor: 1 t = 1.102 US ton.→
- Microfarads to Millifarads ConverterConvert microfarads to millifarads instantly. Exact factor: 1 µF = 0.001 mF.→
- Microfarads to Nanofarads ConverterConvert microfarads to nanofarads instantly. Exact factor: 1 µF = 1,000 nF.→
- Microhenries to Nanohenries ConverterConvert microhenries to nanohenries instantly. Exact factor: 1 µH = 1,000 nH.→
- Miles per gallon (US) to Liters per 100 km ConverterConvert miles per gallon (us) to liters per 100 km instantly. Exact formula shown with the result.→
- Miles to Kilometers ConverterConvert miles to kilometers instantly. Exact factor: 1 mi = 1.609 km.→
- Miles/hour to Kilometers/hour ConverterConvert miles/hour to kilometers/hour instantly. Exact factor: 1 mph = 1.609 km/h.→
- Miles/hour to Meters/second ConverterConvert miles/hour to meters/second instantly. Exact factor: 1 mph = 0.44704 m/s.→
- Millihenries to Microhenries ConverterConvert millihenries to microhenries instantly. Exact factor: 1 mH = 1,000 µH.→
- Milliliters to Cups (US) ConverterConvert milliliters to cups (us) instantly. Exact factor: 1 mL = 0.00423 cup.→
- Milliliters to Fluid ounces (US) ConverterConvert milliliters to fluid ounces (us) instantly. Exact factor: 1 mL = 0.03381 fl oz.→
- Millimeters to Inches ConverterConvert millimeters to inches instantly. Exact factor: 1 mm = 0.03937 in.→
- mL/s to L/min ConverterConvert ml/s to l/min instantly. Exact factor: 1 mLs = 0.06 Lmin.→
- Nanofarads to Picofarads ConverterConvert nanofarads to picofarads instantly. Exact factor: 1 nF = 1,000 pF.→
- Newton-meters to Pound-feet ConverterConvert newton-meters to pound-feet instantly. Exact factor: 1 Nm = 0.73756 lbft.→
- Newton-meters to Pound-inches ConverterConvert newton-meters to pound-inches instantly. Exact factor: 1 Nm = 8.851 lbin.→
- Newtons to Kilogram-force ConverterConvert newtons to kilogram-force instantly. Exact factor: 1 N = 0.10197 kgf.→
- Newtons to Pounds-force ConverterConvert newtons to pounds-force instantly. Exact factor: 1 N = 0.22481 lbf.→
- Number Systems CalculatorOne tool for every way of writing a number: spell numbers in words (to trillions), parse words back to digits, ordinals like 42nd, Roman numerals both directions, digit sums and digital roots, digit reversal with a palindrome check, and a step-by-step long division walkthrough.→
- Ounces to Grams ConverterConvert ounces to grams instantly. Exact factor: 1 oz = 28.35 g.→
- Ounces to Pounds ConverterConvert ounces to pounds instantly. Exact factor: 1 oz = 0.0625 lb.→
- Pecks (US) to Dry quarts (US) ConverterConvert pecks (us) to dry quarts (us) instantly. Exact factor: 1 pk = 8 dry qt.→
- Percentage CalculatorThree percentage modes in one tool: what is X% of Y, X is what percent of Y, and percentage increase or decrease — each with the substituted formula shown.→
- Phots to Lux ConverterConvert phots to lux instantly. Exact factor: 1 ph = 10,000 lx.→
- Picas to Points ConverterConvert picas to points instantly. Exact factor: 1 pc = 12 pt.→
- Pints (US) to Milliliters ConverterConvert pints (us) to milliliters instantly. Exact factor: 1 pt = 473.2 mL.→
- Pixels to Points ConverterConvert pixels to points instantly. Exact factor: 1 px = 0.75 pt.→
- Points to Inches ConverterConvert points to inches instantly. Exact factor: 1 pt = 0.01389 in.→
- Points to Pixels ConverterConvert points to pixels instantly. Exact factor: 1 pt = 1.333 px.→
- Pound-feet to Kilogram-force meters ConverterConvert pound-feet to kilogram-force meters instantly. Exact factor: 1 lbft = 0.13825 kgfm.→
- Pound-feet to Newton-meters ConverterConvert pound-feet to newton-meters instantly. Exact factor: 1 lbft = 1.356 Nm.→
- Pound-inches to Newton-meters ConverterConvert pound-inches to newton-meters instantly. Exact factor: 1 lbin = 0.11298 Nm.→
- Pounds to Kilograms ConverterConvert pounds to kilograms instantly. Exact factor: 1 lb = 0.45359 kg.→
- Pounds to Ounces ConverterConvert pounds to ounces instantly. Exact factor: 1 lb = 16 oz.→
- Pounds-force to Newtons ConverterConvert pounds-force to newtons instantly. Exact factor: 1 lbf = 4.448 N.→
- Pounds-force to Ounces-force ConverterConvert pounds-force to ounces-force instantly. Exact factor: 1 lbf = 16 ozf.→
- Pounds/sq inch to Bar ConverterConvert pounds/sq inch to bar instantly. Exact factor: 1 psi = 0.06895 bar.→
- Pounds/sq inch to Kilopascals ConverterConvert pounds/sq inch to kilopascals instantly. Exact factor: 1 psi = 6.895 kPa.→
- Power ConverterConvert Watts, kilowatts, horsepower, and BTU per hour for engines and appliances. Live conversion with the exact factor or formula shown.→
- Pressure ConverterConvert Pascal, bar, psi, atmosphere, and torr for tires, pumps, and weather. Live conversion with the exact factor or formula shown.→
- Radians to Degrees ConverterConvert radians to degrees instantly. Exact factor: 1 rad = 57.296 °.→
- Revolutions/min to Hertz ConverterConvert revolutions/min to hertz instantly. Exact factor: 1 rpm = 0.01667 Hz.→
- Revolutions/min to Radians/sec ConverterConvert revolutions/min to radians/sec instantly. Exact factor: 1 rpm = 0.10472 rads.→
- Speed ConverterConvert km/h, mph, m/s, ft/s, and knots for running, driving, and flying. Live conversion with the exact factor or formula shown.→
- Square feet to Acres ConverterConvert square feet to acres instantly. Exact factor: 1 ft² = 0.000023 acres.→
- Square feet to Square meters ConverterConvert square feet to square meters instantly. Exact factor: 1 ft² = 0.0929 m².→
- Square inches to Square centimeters ConverterConvert square inches to square centimeters instantly. Exact factor: 1 in² = 6.452 cm².→
- Square kilometers to Square miles ConverterConvert square kilometers to square miles instantly. Exact factor: 1 km² = 0.3861 mi².→
- Square meters to Acres ConverterConvert square meters to acres instantly. Exact factor: 1 m² = 0.0002471 acres.→
- Square meters to Square feet ConverterConvert square meters to square feet instantly. Exact factor: 1 m² = 10.764 ft².→
- Square miles to Square kilometers ConverterConvert square miles to square kilometers instantly. Exact factor: 1 mi² = 2.59 km².→
- Square yards to Square meters ConverterConvert square yards to square meters instantly. Exact factor: 1 yd² = 0.83613 m².→
- Sticks to Grams ConverterConvert sticks to grams instantly. Exact factor: 1 stick = 113.4 g.→
- Sticks to Tablespoons ConverterConvert sticks to tablespoons instantly. Exact factor: 1 stick = 8 tbsp.→
- Stones to Kilograms ConverterConvert stones to kilograms instantly. Exact factor: 1 st = 6.35 kg.→
- Tablespoons (US) to Milliliters ConverterConvert tablespoons (us) to milliliters instantly. Exact factor: 1 tbsp = 14.787 mL.→
- Tablespoons to Grams ConverterConvert tablespoons to grams instantly. Exact factor: 1 tbsp = 14.175 g.→
- Teaspoons (US) to Milliliters ConverterConvert teaspoons (us) to milliliters instantly. Exact factor: 1 tsp = 4.929 mL.→
- Temperature ConverterConvert Celsius, Fahrenheit, Kelvin, and Rankine with exact conversion formulas. Live conversion with the exact factor or formula shown.→
- Terabytes to Gigabytes ConverterConvert terabytes to gigabytes instantly. Exact factor: 1 TB = 1,000 GB.→
- Time ConverterConvert Seconds, minutes, hours, days, weeks, and years converted precisely. Live conversion with the exact factor or formula shown.→
- Torque ConverterConvert Newton-meters and pound-feet for engines, wrenches, and motors. Live conversion with the exact factor or formula shown.→
- Trigonometry CalculatorAll six trig functions of any angle — sin, cos, tan, cot, sec, csc — in degrees or radians, with the angle reduced, its quadrant signs, and a classic values table.→
- Turns to Degrees ConverterConvert turns to degrees instantly. Exact factor: 1 turns = 360 °.→
- Typography ConverterConvert Points, pixels, picas, and inches on the CSS 96-dpi reference grid. Live conversion with the exact factor or formula shown.→
- US tons to Metric tons ConverterConvert us tons to metric tons instantly. Exact factor: 1 US ton = 0.90718 t.→
- Volume (Dry) ConverterConvert US dry pints, dry quarts, dry gallons, pecks, and bushels against liters. Live conversion with the exact factor or formula shown.→
- Volume ConverterConvert Cups, spoons, fluid ounces, liters, and gallons — US and imperial. Live conversion with the exact factor or formula shown.→
- Watt-hours to Kilojoules ConverterConvert watt-hours to kilojoules instantly. Exact factor: 1 Wh = 3.6 kJ.→
- Watts to Horsepower (mech) ConverterConvert watts to horsepower (mech) instantly. Exact factor: 1 W = 0.00134 hp.→
- Weight & Mass ConverterConvert Kilograms, pounds, ounces, stones, and tons converted exactly. Live conversion with the exact factor or formula shown.→
- Yards to Meters ConverterConvert yards to meters instantly. Exact factor: 1 yd = 0.9144 m.→
How this manual is organized
Each entry above opens a one-page tool: inputs on the left, the live result on its color board, and beneath the card the formula with worked examples and the method's limits. Save the tools you use often — they'll wait on this shelf next visit.