Length
Convert millimeters, meters, miles, and more.
Dashboard
Every unit, one workspace.
Convert instantly across length, weight, area, volume, temperature, time, speed, pressure, power, energy, angle, fuel economy, density, force, and torque — with history, favorites, and one-click export.
15 tools15 quick widgetsOffline · No sign-up
Quick convert
Instant unit conversion.
Live conversions with zero navigation. Pin the widgets you reach for most.
Weight
Convert grams, kilograms, pounds, and stones.
Area
Convert square meters, acres, hectares, and more.
Volume
Convert liters, gallons, pints, and cubic meters.
Temperature
Celsius, Fahrenheit, and Kelvin — accurate to the tenth.
Time
Milliseconds through years, accurately.
Speed
m/s, km/h, mph, and knots.
Pressure
Pascal, bar, psi, and atmospheres.
Power
Watts, kilowatts, and horsepower.
Energy
Joules, calories, and watt-hours.
Angle
Degrees and radians.
Fuel Economy
km/L, mpg (US), and mpg (UK).
Density
kg/m³ and g/cm³ — the two most-used density units.
Force
Newtons, kilonewtons, and pound-force.
Torque
Newton-meters and pound-feet.
Favorites
Pin tools and widgets from anywhere in this dashboard. They sync across your device.
Recent activity
Nothing yet. Convert or calculate on this dashboard and the last 100 actions appear here.
Most used
Popular calculators.
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Length Converter
Convert mm, cm, m, km, in, ft, yd, mi, and nautical miles.
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Weight Converter
Convert mg, g, kg, ton, oz, lb, and stone.
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Area Converter
Convert m², km², acre, hectare, ft², and yd².
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Volume Converter
Convert mL, L, m³, ft³, gallons (US/UK), and pints.
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Trending this week.
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Temperature Converter
Convert Celsius, Fahrenheit, and Kelvin.
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Volume Converter
Convert mL, L, m³, ft³, gallons (US/UK), and pints.
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Weight Converter
Convert mg, g, kg, ton, oz, lb, and stone.
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Popular
Length Converter
Convert mm, cm, m, km, in, ft, yd, mi, and nautical miles.
Coverage
Tools per category
15 tools across 1 category.
- Units15
Your usage
Most-used items
Aggregated from your recent activity on this device. Stays local unless you sync.
Use a widget or open a calculator — usage will appear here.
FAQ
About Universal Converter Dashboard.
What is the Universal Converter Hub?
A single workspace that combines every unit converter with dashboards for scientific, mathematical, electrical, mechanical, civil, construction, chemistry, physics, education, time, and digital tools — with instant quick-convert widgets, favorites, history, and offline exports.
Do calculations happen in my browser?
Yes. Every converter and calculator runs entirely on your device using pure JavaScript engines. No values leave your browser, no accounts, no uploads.
How do favorites and history persist?
Both are stored in your browser's local storage under stable, versioned keys. You can clear or export them at any time; a future account layer will sync the same JSON schema without redesign.
Can I add my own dashboard?
Yes — a dashboard is one entry in `src/lib/dashboard/dashboards.ts`. The reusable Dashboard Shell renders everything else automatically.
How accurate are the conversions?
All factors are sourced from SI / NIST reference tables and executed through a shared Precision Engine that eliminates floating-point drift. You can choose 0–12 decimal places per conversion, and extreme values switch to scientific notation automatically.
Do conversions require an internet connection?
No. Every converter is 100% client-side and offline-first — nothing is uploaded, cached, or logged, and the tools keep working once the page has loaded.
Which categories are supported?
Length, Weight, Area, Volume, Temperature, Time, Speed, Pressure, Energy, Power, Angle, Fuel Economy, Density, Force, and Torque — with more categories being added.
Can I export or print my conversions?
Yes. Every conversion produces Markdown, CSV, JSON, and plain-text artifacts you can copy, download, print, or share.
Related categories
Keep exploring.
Engineering dashboards
One hub, twelve dashboards.
Open a specialized dashboard for scientific, engineering, or digital work — each with its own quick widgets, favorites, and history.