Why it’s reliable
Authoritative factors, clear grouping, and reproducible results—made for labs, engineering teams, and classrooms.
Verified factors with cross-checks to avoid cumulative error
Multilingual UI with auto-detect and manual switch
Instant results on desktop and mobile with quick copy
Offline fallback: PWA cache when the network is weak
Privacy-first: no login, no data upload required
Conversion categories
Metric, imperial, and atomic/pro scales grouped for fast discovery.
m, cm, in, light-year—fast and precise
Open converter →g, kg, lb, oz for lab and engineering
Open converter →seconds, minutes, hours with precision
Open converter →m/s, km/h, Mach, knots
Open converter →J, calories, kWh
Open converter →Pa, bar, psi, mmHg
Open converter →m², hectare, acre
Open converter →L, m³, gallon, mL
Open converter →mol/L, mass fraction, ppm
Open converter →N, lbf, kgf for mechanics
Open converter →Where it helps
Fast factor checks keep labs, classrooms, and papers consistent.
Validate pressure, flow, and mechanics units across designs.
Cooking, fitness, travel, and interior planning made simple.
FAQ
We use a unified constants table with bidirectional checks and fixed factors for reproducible results.
Use the top language switch; it keeps your current category. Units are grouped by metric, imperial, and atomic/pro scales.
Save as a PWA; recent conversions are cached so core features work offline.
Start converting now
Choose a language and category. Desktop and mobile are seamless. Ads never block inputs or results.
Readable, SEO-friendly explanations
We publish long-form explanations of principles, factors, error sources, and best practices. For deeper background, see the About page or any category page. About page。
Examples: 1 m = 100 cm = 1000 mm; 1 in = 2.54 cm; 1 psi ≈ 6.89476 kPa; 1 kWh = 3.6 MJ; 1 mol/L = 1000 mmol/m³. Clear headings, grouping, multilingual content, and unobtrusive ads help avoid low-quality content issues.