Unit Converters
Convert between metric and imperial units for weight, length, temperature, and volume with exact mathematical precision. Every converter runs instantly in your web browser with bidirectional swapping, step-by-step formulas, and quick-reference lookup tables.
All Units Tools (70)
Kg to Lbs Converter – Kilograms to Pounds
Convert kilograms to pounds with the international avoirdupois standard factor of 2.2046226218 lbs per kg.
Lbs to Kg Converter – Pounds to Kilograms
Convert pounds to kilograms using the legally defined international factor of 0.45359237 kg per pound.
Cm to Inches Converter – Centimeters to Inches
Convert centimeters into inches with the exact international metric conversion factor of 1 inch = 2.54 cm.
Inches to Cm Converter – Inches to Centimeters
Convert imperial inches into metric centimeters with the exact factor of 2.54 cm per inch.
Celsius to Fahrenheit Converter – °C to °F
Convert temperatures from Celsius to Fahrenheit using the exact thermodynamic formula (°C × 9/5) + 32.
Fahrenheit to Celsius Converter – °F to °C
Convert Fahrenheit temperatures to Celsius with the standard formula (°F - 32) × 5/9.
Km to Miles Converter – Kilometers to Miles
Convert kilometers to statute miles using the international factor of 0.6213711922 miles per kilometer.
Miles to Km Converter – Miles to Kilometers
Convert statute miles to kilometers with the exact international factor of 1.609344 km per mile.
Meters to Feet Converter – M to Ft
Convert meters to feet using the exact international factor of 3.280839895 feet per meter.
Feet to Meters Converter – Ft to M
Convert imperial feet into metric meters using the exact international factor of 0.3048 meters per foot.
Liters to Gallons Converter – L to Gal
Convert metric liters to US liquid gallons using the exact standard factor of 0.2641720524 gallons per liter.
Ml to Oz Converter – Milliliters to Fluid Ounces
Convert milliliters to US fluid ounces with the exact factor of 29.5735295625 ml per fluid ounce.
Inches to Feet Converter – In to Ft
Convert inches to feet using the exact definition of 12 inches per foot with decimal and remainder formats.
Grams to Ounces Converter – G to Oz
Convert metric grams into avoirdupois ounces using the legally certified factor of 28.349523125 grams per ounce.
Ounces to Grams Converter (oz to g with Exact NIST Precision)
Convert ounces to grams and grams to ounces with exact NIST international avoirdupois precision.
Square Meters to Square Feet Converter (m² to sq ft)
Convert area measurements between square meters (m²) and square feet (sq ft) with exact international precision.
Acres to Square Feet Converter (ac to sq ft)
Convert land area between acres and square feet with exact legal survey precision (1 acre = 43,560 sq ft).
Cups to mL Converter (US & Metric Cup to Milliliters)
Convert liquid volume between cups and milliliters supporting US Customary, US Legal Food, and Metric cup standards.
ml to Cups Converter (Exact US & Metric Cups)
Convert milliliters (ml) to US customary, metric, and UK cups with exact NIST mathematical factors.
mg to g Converter: Milligrams to Grams Calculator
Convert milligrams (mg) to grams (g) instantly using exact SI metric mass standards.
KB to MB Converter: Kilobytes to Megabytes
Convert kilobytes to megabytes using both decimal (1,000 KB) and binary (1,024 KiB) computing standards.
Kelvin to Celsius Converter (°C = K - 273.15)
Convert absolute temperature in Kelvin (K) to degrees Celsius (°C) with exact scientific precision.
Meters to Yards Converter (yd = m ÷ 0.9144)
Convert length in meters (m) to international yards (yd) using exact 1959 treaty conversion standards.
Minutes to Hours Converter (Decimal & Time Breakdown)
Convert minutes into decimal hours and hours-and-minutes clock breakdowns with exact sexagesimal arithmetic.
Celsius to Kelvin Converter (K = °C + 273.15)
Convert temperature from degrees Celsius (°C) to absolute Kelvin (K) with exact scientific precision.
Hectares to Acres Converter (Exact ha to ac)
Convert land area from hectares (ha) to international acres (ac) with exact legal land surveying standards.
Miles to Feet Converter (1 mi = 5,280 ft exact)
Convert distance in miles (mi) to feet (ft) using the exact legal definition of 5,280 feet per statute mile.
Radians to Degrees Converter (deg = rad × 180 / π)
Convert angular measurement from radians (rad) to degrees (°) using exact high-precision pi arithmetic.
Degrees to Radians Converter (rad = deg × π / 180)
Convert angles from degrees (°) into radians (rad) using high-precision pi arithmetic.
Tablespoons to ml Converter (US, Metric & UK Tbsp)
Convert culinary tablespoons (tbsp) to milliliters (ml) with exact US customary, metric, and UK volume standards.
Yards to Meters Converter (m = yd × 0.9144 exact)
Calculate metric meters from imperial yard measurements for sports fields, golf courses, and landscaping projects.
Ounces to ml Converter (US Fluid Ounces to ml)
Convert liquid volume in US fluid ounces (fl oz) to milliliters (ml) with exact NIST standards.
mm to inches Converter: Millimeters to Inches Online
Convert millimeters to decimal and fractional inches with high precision.
Inches to mm Converter: Inches to Millimeters
Convert decimal and fractional inches to exact millimeters instantly.
lbs to oz Converter: Pounds to Ounces Online
Convert weight from pounds to ounces and split lbs plus oz.
cm to Feet Converter: Centimeters to Feet & Inches
Convert centimeters to decimal feet as well as feet plus inches.
oz to lbs Converter: Ounces to Pounds Online
Convert ounces to decimal pounds and split pounds plus ounces.
cm to mm Converter: Centimeters to Millimeters
Convert centimeters (cm) to millimeters (mm) with exact metric multiplication.
mm to cm Converter: Millimeters to Centimeters
Convert millimeters (mm) to centimeters (cm) with exact SI division.
Feet to Miles Converter: Convert ft to mi Online
Convert linear feet (ft) to statute miles (mi) with exact division.
Feet to cm Converter: Feet to Centimeters Online
Convert feet and inches to metric centimeters with exact precision.
ml to l Converter: Milliliters to Liters Online
Convert milliliters (ml) to liters (l) with exact metric division.
Cups to oz Converter: US Cups to Fluid Ounces
Convert US cups to fluid ounces (fl oz) with exact multiplication by 8.
Knots to mph Converter: Nautical Knots to Miles Per Hour
Convert maritime and aviation knots to land miles per hour (mph).
mcg to mg Converter: Micrograms to Milligrams Online
Convert micrograms (mcg/µg) to milligrams (mg) with exact SI division.
Gallons to Liters Converter: US Gallons to Liters
Convert US gallons to liters with exact international volume precision.
GB to MB Converter: Gigabytes to Megabytes Online
Convert gigabytes (GB) to megabytes (MB) in binary and decimal formats.
kph to mph Converter: Kilometers to Miles Per Hour
Convert kilometers per hour (km/h) to miles per hour (mph).
Tons to Pounds Converter: US Short Tons to lbs
Convert US short tons to pounds (lbs) with exact multiplication by 2,000.
Bar to psi Converter: Pressure Conversion Online
Convert pressure from bar to pounds per square inch (psi).
mph to kph Converter: Miles to Kilometers Per Hour
Convert miles per hour (mph) to kilometers per hour (km/h).
Watts to Amps Calculator: Convert W to A Online
Calculate electric current in amps from power in watts and voltage.
kW to HP Converter: Kilowatts to Horsepower Online
Convert power in kilowatts (kW) to mechanical or metric horsepower (hp).
Quarts to Liters Converter: US Quarts to Liters
Convert US liquid quarts (qt) to liters (L) with exact precision.
TB to GB Converter: Terabytes to Gigabytes Online
Convert terabytes (TB) to gigabytes (GB) in binary and decimal formats.
psi to bar Converter: Pressure Conversion Online
Convert pressure from pounds per square inch (psi) to bar.
cc to ml Converter: Cubic Centimeters to Milliliters
Convert cubic centimeters (cc) to milliliters (ml) with exact 1:1 parity.
Conversion Calculator: Length, Weight & Temperature
Universal unit converter for metric and imperial lengths, masses, and temperatures.
Feet to Inches Calculator: Imperial & Metric Units
Convert feet and inches measurements to total inches, fractional inches, and metric cm.
Scientific Notation Converter: Standard & Engineering
Convert decimal numbers to scientific notation (a × 10^b) and engineering notation.
Decimal to Binary Converter
Convert base-10 integers to binary, hex, and octal with two's complement representations.
RAR to ZIP Converter
Convert compressed RAR archives into universal ZIP format for easy opening everywhere.
Text to Binary Converter
Convert words and sentences into 8-bit binary code and decode binary to text.
Number to Words Converter
Convert numerical digits into fully spelled-out English words and currency text.
Universal Unit Converter
Universal conversion calculator across metric and imperial measurement dimensions.
Temperature Converter
Convert temperatures between Celsius, Fahrenheit, Kelvin, and Rankine scales instantly.
Weight Converter
Convert weight and mass between kilograms, pounds, ounces, grams, stones, and tons.
Ring Size Calculator & Converter
Find your exact ring size from millimeter circumference or diameter with US, UK, and EU conversions.
Length Converter
Convert distance and length between feet, inches, meters, centimeters, yards, and miles.
Baking Conversion Calculator
Convert baking recipe measurements between cups, grams, ounces, and spoons.
Precision Unit Conversion with International Standards
Modern global engineering, international commerce, and everyday life require seamless translation between the International System of Units (SI Metric) and the United States Customary System (USCS Imperial). Even minor rounding discrepancies in conversion multipliers can lead to cumulative errors in logistics, manufacturing, and academic research.
Toolzy's unit conversion suite is built around high-precision constants defined by the National Institute of Standards and Technology (NIST SP 811) and the International Organization for Standardization (ISO 80000). Every calculation utilizes 64-bit IEEE 754 floating-point arithmetic with rational fraction anchors to eliminate drift across extreme orders of magnitude.
All conversions run entirely within your client-side browser engine. By eliminating server roundtrips, you get instantaneous bidirectional swapping, immediate dynamic precision adjustment, and zero data leakage of proprietary dimensions or quantities.
Key Formulas & Mathematical Standards
Precision algorithms and verified standards powering our unit converters
Temperature: Celsius to Fahrenheit
Multiplies the Celsius value by 1.8 and shifts the freezing point offset by 32 degrees.
Weight: Kilograms to International Pounds
Based on the 1959 International Yard and Pound Agreement defining the exact standard pound avoirdupois.
Length: Centimeters to Inches
Standard international definition adopted across aerospace, engineering, and manufacturing disciplines.
Volume: Liters to US Fluid Gallons
Standard US liquid gallon based on 231 cubic inches.
Who Uses Our Unit Converters?
Frequently Asked Questions
Common questions about using our unit converters
How accurate are the unit conversions on Toolzy?▼
All conversion factors adhere strictly to official NIST and ISO measurement definitions. Calculations run locally using IEEE 754 double-precision floating-point numbers with precision display controls to prevent rounding artifacts.
Can I convert values bidirectionally?▼
Yes. Every converter features an instant swap toggle that reverses input and output units without requiring you to re-type your numeric values.
Do the converters handle extreme scientific notation?▼
Yes, the converters accept standard scientific decimal inputs (e.g., 1.5e-4) and output clearly formatted values with configurable decimal places.
Is my entered measurement data recorded or logged?▼
Never. All conversions occur entirely on your local device within client-side JavaScript. No numbers, units, or timestamps are sent to any remote server.
Explore Other Categories
Discover more fast, browser-based utilities across our specialized collections
Math & Education
Percentage changes, fractions, square roots, geometry & statistics.
Date & Time
Calendar arithmetic, business day intervals, stopwatch & multi-counter.
Home & Construction
Paint coverage, pool volume, topsoil, roof pitch, square footage & materials.
Finance
Discount savings, markup, profit margins, CD returns & overtime pay.