Length Calculators
Browse our comprehensive collection of length calculators for conversion, perimeter, distance, scale, and more. Free online tools for metric, imperial, nautical, astronomical, and scientific length measurements.
Meters to Kilometers
Convert meters to kilometers (1 km = 1000 m) with step-by-step division.
metricKilometers to Meters
Convert kilometers to meters (1 km = 1000 m) with multiplication.
metricCentimeters to Meters
Convert centimeters to meters (1 m = 100 cm) with division by 100.
metricMeters to Centimeters
Convert meters to centimeters (1 m = 100 cm) with multiplication.
metricMillimeters to Centimeters
Convert millimeters to centimeters (1 cm = 10 mm) with division.
metricCentimeters to Millimeters
Convert centimeters to millimeters (1 cm = 10 mm) with multiplication.
metricDecimeters to Meters
Convert decimeters to meters (1 m = 10 dm) with division.
metricMeters to Decimeters
Convert meters to decimeters (1 m = 10 dm) with multiplication.
metricFeet to Inches
Convert feet to inches (1 ft = 12 in) with multiplication by 12.
imperialInches to Feet
Convert inches to feet (1 ft = 12 in) with division by 12.
imperialYards to Feet
Convert yards to feet (1 yd = 3 ft) with multiplication by 3.
imperialFeet to Yards
Convert feet to yards (1 yd = 3 ft) with division by 3.
imperialMiles to Feet
Convert miles to feet (1 mi = 5280 ft) with multiplication.
imperialFeet to Miles
Convert feet to miles (1 mi = 5280 ft) with division.
imperialYards to Miles
Convert yards to miles (1 mi = 1760 yd) with division.
imperialMiles to Yards
Convert miles to yards (1 mi = 1760 yd) with multiplication.
imperialRectangle Perimeter
Calculate perimeter of a rectangle (P = 2(l + w)) with step-by-step work.
perimeterSquare Perimeter
Compute perimeter of a square (P = 4s) from side length.
perimeterTriangle Perimeter
Calculate perimeter of a triangle by adding all three sides.
perimeterCircle Circumference
Find circumference of a circle (C = 2ฯr) from radius or diameter.
perimeterRegular Polygon Perimeter
Calculate perimeter of any regular polygon (P = n ร side).
perimeterDistance Between Two Points
Calculate Euclidean distance between two points in 2D or 3D.
perimeterArc Length Calculator
Compute arc length of a circle from radius and central angle.
perimeterTrapezoid Perimeter
Find perimeter of a trapezoid by summing all four sides.
perimeterNanometers to Micrometers
Convert nanometers (nm) to micrometers (ยตm) with division by 1000.
scientificMicrometers to Nanometers
Convert micrometers to nanometers with multiplication by 1000.
scientificAngstroms to Nanometers
Convert angstroms (ร ) to nanometers (1 ร = 0.1 nm).
scientificNanometers to Angstroms
Convert nanometers to angstroms (1 nm = 10 ร ).
scientificPicometers to Nanometers
Convert picometers (pm) to nanometers (1 pm = 0.001 nm).
scientificNanometers to Picometers
Convert nanometers to picometers (1 nm = 1000 pm).
scientificMils (thou) to Millimeters
Convert mils to millimeters (1 mil = 0.0254 mm).
scientificMillimeters to Mils
Convert millimeters to mils (1 mm = 39.3701 mil).
scientificNautical Miles to Kilometers
Convert nautical miles to kilometers (1 nmi = 1.852 km).
nauticalKilometers to Nautical Miles
Convert kilometers to nautical miles (1 km = 0.539957 nmi).
nauticalNautical Miles to Miles
Convert nautical miles to statute miles (1 nmi = 1.15078 mi).
nauticalMiles to Nautical Miles
Convert statute miles to nautical miles (1 mi = 0.868976 nmi).
nauticalFathoms to Meters
Convert fathoms to meters (1 fathom = 1.8288 m).
nauticalMeters to Fathoms
Convert meters to fathoms (1 m = 0.546807 fathom).
nauticalCables to Meters
Convert cables to meters (1 cable = 185.2 m).
nauticalMeters to Cables
Convert meters to cables (1 m = 0.00539957 cable).
nauticalLight Years to Kilometers
Convert light years to kilometers (1 ly โ 9.461e12 km).
astronomicalKilometers to Light Years
Convert kilometers to light years (1 km = 1.057e-13 ly).
astronomicalParsecs to Light Years
Convert parsecs to light years (1 pc = 3.26156 ly).
astronomicalLight Years to Parsecs
Convert light years to parsecs (1 ly = 0.306601 pc).
astronomicalAstronomical Units to Kilometers
Convert AU to kilometers (1 AU โ 1.496e8 km).
astronomicalKilometers to Astronomical Units
Convert kilometers to AU (1 km โ 6.6846e-9 AU).
astronomicalParsecs to Kilometers
Convert parsecs to kilometers (1 pc โ 3.0857e13 km).
astronomicalKilometers to Parsecs
Convert kilometers to parsecs (1 km = 3.2408e-14 pc).
astronomicalPipe Length Calculator
Calculate total pipe length needed for plumbing or construction projects.
engineeringCable Length Estimator
Estimate cable length required for electrical installations with slack.
engineeringFencing Length Calculator
Calculate the length of fencing needed for a perimeter with gates.
engineeringRoad Length Estimator
Estimate road or driveway length from maps or survey data.
engineeringConveyor Belt Length
Calculate conveyor belt length from pulley diameters and center distance.
engineeringExpansion Gap Calculator
Calculate expansion gaps for thermal expansion of materials.
engineeringWire Length from Resistance
Calculate wire length from resistance, resistivity, and cross-sectional area.
engineeringRoof Length from Pitch
Calculate rafter length from roof pitch and horizontal span.
engineeringChains to Meters
Convert surveyor's chains to meters (1 chain = 20.1168 m).
otherMeters to Chains
Convert meters to chains (1 m = 0.0497097 chain).
otherRods to Feet
Convert rods (perches) to feet (1 rod = 16.5 ft).
otherFeet to Rods
Convert feet to rods (1 ft = 0.0606061 rod).
otherLinks to Meters
Convert surveyor's links to meters (1 link = 0.201168 m).
otherMeters to Links
Convert meters to links (1 m = 4.97097 links).
otherFurlongs to Yards
Convert furlongs to yards (1 furlong = 220 yd).
otherYards to Furlongs
Convert yards to furlongs (1 yd = 0.00454545 furlong).
otherWhat Are Length Calculators?
Our Length Calculators collection provides a comprehensive suite of tools for converting between length units, computing perimeters, distances, and solving length-related problems. Whether you're a student, engineer, surveyor, or DIY enthusiast, these calculators deliver accurate results with clear step-by-step explanations.
From metric and imperial conversions to perimeter calculations, distance measurements, scientific precision units, nautical and astronomical distances, and engineering applications, our tools cover the full spectrum of length measurement and calculation.
How to Use This Directory
- Search: Type a keyword into the search bar to find specific calculators by name or description.
- Filter by Category: Use the dropdown to narrow down to a specific length topic โ each option shows the number of tools available.
- Click to Use: Each calculator card links directly to the tool. Click on any card to start your length calculation instantly.
- Explore Category Pages: Use the "Explore More Math & Conversion Calculators" section to access dedicated pages for other related topics.
Why Use Our Length Calculators?
- Comprehensive Coverage: Covers conversions, perimeters, distances, scientific units, nautical, astronomical, and engineering applications.
- Accurate & Reliable: Uses exact conversion factors and geometric formulas.
- Free & Accessible: No registration, no fees โ use any tool instantly on any device.
- Educational: Many tools show the formulas and principles behind the calculations.
- Professional & Personal Use: Designed for students, engineers, surveyors, and anyone working with lengths.
โ Length Calculators FAQ
What types of length calculations can I perform?
You can convert between metric units (m, km, cm, mm), imperial/US units (ft, in, yd, mi), scientific units (nm, ยตm, ร , pm), nautical units (nmi, fathom, cable), astronomical units (ly, pc, AU), calculate perimeters of shapes, distances between points, arc lengths, and engineering-specific lengths like pipe, cable, and belt lengths.
How do I convert meters to feet?
Use our length conversion calculators. Multiply meters by 3.28084 to get feet, or use the dedicated Meters to Feet converter in the Imperial category.
How do I calculate the perimeter of a rectangle?
Use our Rectangle Perimeter calculator. Enter length and width, and the tool will compute P = 2(l + w) with step-by-step work.
What is a nautical mile and how is it different from a statute mile?
A nautical mile is based on the Earth's circumference and equals 1.852 km, used in maritime and aviation. A statute mile is 1.60934 km. Our converters handle both.
How do I convert light years to kilometers?
Use our Light Years to Kilometers converter. Multiply light years by 9.4607e12 to get kilometers, with scientific notation explanation.
What is a chain in surveying?
A chain is a unit of length equal to 66 feet or 20.1168 meters, used in land surveying. Our converters handle chain conversions.
Are these calculators accurate for engineering and construction?
Yes, our calculators use exact conversion factors and geometric formulas, making them suitable for professional engineering, construction, and surveying.
How often are new length calculators added?
We regularly add new calculators based on user requests. If you have a suggestion, please contact us.
Can I calculate distance between two points on a map?
Our Distance Between Two Points calculator computes Euclidean distance in 2D or 3D using coordinates. For map distances, you can use conversion factors to translate to real-world units.