Free online unit converter with 36 categories for length, weight, temperature, area, volume, voltage, storage and more. Metric, imperial and Chinese units.
Free online length converter. 24 units across metric, imperial, nautical, astronomical, and Chinese traditional. Local browser compute, no upload.
Free mass/weight converter: 25 metric, imperial, Chinese, troy units. Runs locally, no uploads. For fitness, baking, jewelry, shopping, shipping.
Free online area converter for square meters, square feet, acres, hectares, mu, square kilometers, and more. Great for real estate, land measurement, construction takeoffs, farm plots, and international property listings.
The free online volume converter supports instant conversion between mL, L, m³, cubic feet, British and American liquid volume units, barrels (bbl) and municipal he/sheng/dou/hu, and is suitable for comparison of packaging specifications, storage tank capacity, building material volume and import and export data.
Free online time unit converter, supports ns, μs, ms, s, min, h, day, week, month (30 days), year (365 days) real-time conversion, suitable for unification of delays, working hours, SLA, learning plans and reports, all completed locally in the browser.
Free online speed/velocity unit converter: supports bidirectional conversion among 10 speed units — m/s, km/h, mph, knot (kt), ft/s, Mach, km/s, light speed c, mm/s, cm/s — covering SI metric, imperial/US customary, nautical, aviation Mach, and relativistic light speed. Instant results as you type; all calculations run locally in your browser to protect your privacy.
Free online AWG wire gauge converter with voltage drop calc, NEC ampacity tables, skin effect calculator, and quick lookup for electricians.
Free online force converter supporting 13 units: newton(N/kN), kilogram-force(kgf/gf), pound-force(lbf/ozf), dyne(dyn), poundal(pdl). SI/engineering/imperial/CGS systems. Browser-based, no data upload.
Free online pressure unit converter, supports Pa, hPa, kPa, MPa, bar, mbar, psi, atm, mmHg, inHg, mmH₂O, kgf/cm² real-time conversion, suitable for tire pressure, hydraulic and pneumatic, meteorological and vacuum gauge data collection, all completed locally in the browser.
Free online energy/work/heat unit converter supporting bidirectional instant conversion between 9 energy units: Joule (J), Kilojoule (kJ), Watt-hour (Wh), Kilowatt-hour (kWh), Calorie (cal), Kilocalorie (kcal), British Thermal Unit (BTU), Metric Horsepower-hour (PS·h), Imperial Horsepower-hour (HP·h). Covers physics experiments, nutrition, electricity metering, HVAC, automotive engineering scenarios. Browser-local calculation protects data privacy.
Free online power converter for W, kW, MW, hp, and PS. Great for motor nameplates, car output, generators, pumps, and compressor specs. All calculations run locally in your browser.
Free online density unit converter supporting instant bidirectional conversion between 7 density units: kilogram per cubic meter (kg/m³), gram per cubic centimeter (g/cm³), kilogram per cubic decimeter (kg/dm³), pound per cubic foot (lb/ft³), pound per cubic inch (lb/in³), pound per US gallon (lb/USgal), pound per UK gallon (lb/UKgal). Covers physics/chemistry experiments, materials engineering, fluid mechanics, petrochemical and other scenarios. Calculates locally in browser without internet, protecting data privacy.
Free online torque unit converter, supports N·m, mN·m, kN·m, kgf·m, kgf·cm, lbf·ft, lbf·in real-time conversion, suitable for torque wrench setting, engine parameters, mechanical assembly and specification comparison, all completed locally in the browser.
Free temperature converter: °C, °F, K, °R, °Ré. Precise offset formulas, runs locally in browser with no uploads. For baking, fever, weather, and science.
Free online angle converter supporting instant bidirectional conversion between 7 units: degree (°), radian (rad), arcminute ('), arcsecond ("), right angle, turn (revolution), milliradian (mrad). Suitable for math, programming, engineering, and navigation scenarios. All calculations run locally in your browser — no data upload.
Free online currency converter supporting 30+ currencies including USD, EUR, CNY, JPY, GBP. Calculate with your own exchange rate—ideal for cross-border shopping, travel, international trade. All calculations run locally in your browser, no data uploaded.
Free online frequency unit converter supporting instant bidirectional conversion between 4 SI frequency units: hertz (Hz), kilohertz (kHz), megahertz (MHz), gigahertz (GHz). Covers electronic circuits, wireless communications, audio engineering, CPU clocks, sample rates and more. All calculations run locally in your browser with no internet connection required, protecting your data privacy.
Free online voltage unit converter supporting bidirectional instant conversion between 4 SI voltage units: kilovolts (kV), volts (V), millivolts (mV), microvolts (μV/uV). Covers electronic circuits, power systems, battery selection, signal measurement and other scenarios, based on common Ohm's law unit system, browser-side calculation with no data upload.
Free online current unit converter supporting instant bidirectional conversion between 3 SI current units: ampere (A), milliampere (mA), microampere (μA/uA). Covers electronic circuits, PCB design, battery charge/discharge, appliance repair scenarios, browser-based local calculation with no data upload.
Free online electrical resistance unit converter supporting instant bidirectional conversion between 4 SI resistance units: milliohm (mΩ), ohm (Ω), kilohm (kΩ), and megohm (MΩ). Covers electronic circuits, PCB design, resistor selection, insulation testing and more scenarios. Based on the Ohm's Law unit system, all calculations run locally in your browser with no internet connection required, protecting your data privacy.
Free online capacitance unit converter supporting bidirectional instant conversion between 5 SI units: Farad (F), millifarad (mF), microfarad (μF/uF), nanofarad (nF), picofarad (pF). Covers electronic circuit design, SMD capacitor selection, power supply filtering, decoupling capacitor calculation and other common scenarios. All calculations run locally in your browser - no circuit parameters are uploaded.
Free online inductance converter for henry (H), millihenry (mH), microhenry (μH), nanohenry (nH), picohenry (pH), abhenry (abH). Instant 1000x conversions with no offset—essential for SMPS, RF circuits, transformer design. Runs locally in browser, no uploads.
Free online charge unit converter supporting instant bidirectional conversion between 4 SI charge units: coulombs (C), millicoulombs (mC), microcoulombs (μC/uC), and nanocoulombs (nC). Covers physics learning, electrostatic experiments, capacitor energy storage, electrochemical electrolysis and other scenarios. All calculations run locally in your browser with no data uploads.
Free online ppm/ppb/ppt/mg/L/g/mL converter. Instant private conversion for water testing, environmental work, chemistry. Dilute aqueous approx (ppm≈mg/L).
Free online illuminance converter for lux (lx), foot-candle (fc), phot (ph), nox (nx). Instant conversions—essential for photography metering, lighting design, architectural daylighting, plant lighting. Runs locally in browser, no uploads.
Free online lumen-to-candela converter for quick lm and cd comparison. Useful for flashlights, spotlights, bike lights, and car lights. Precise conversion still depends on beam angle or solid angle.
Free online data storage unit converter: supports bidirectional conversion between 7 digital storage units (bit, B, KB, MB, GB, TB, PB), precise binary (1024) calculation, covers HDD/USB/RAM/phone storage/file size/bandwidth scenarios, local browser calculation protects privacy.
Free online data transfer rate converter supporting 18 units including bps/Bps/kbps/Mbps/Gbps/Tbps/KB/s/MB/s/GB/s with decimal (1000) and binary (1024) bases. Essential for speed tests, bandwidth calculation, download time estimates. Runs locally in your browser.
Free online blood sugar unit converter for accurate conversion between mg/dL (US/China standard) and mmol/L (international SI unit). Conversion factor based on glucose molecular weight 180.156 g/mol (1 mg/dL = 0.0555 mmol/L). For people with diabetes and healthcare professionals for daily recording. All calculations run locally in your browser - no health data uploaded.
Free online material hardness converter for Vickers HV, Brinell HB, Rockwell HRC/HRB/HRA, Leeb HLD, Shore HS, Mohs scales. Approximate conversion for steel/aluminum alloys. Empirical values—browser-calculated, no upload.
Free online radiation dose converter, supports instant conversion of Sv, mSv, μSv, rem, suitable for dose equivalent/effective dose unit arrangement in radiation protection records, monitoring reports and medical imaging data, all completed locally in the browser.
Free online radioactivity (activity) unit converter: bidirectional conversion between Bq (Becquerel), kBq, MBq, and Ci (Curie) — 4 units total. Precise conversion at 1 Ci = 3.7×10¹⁰ Bq, covering nuclear medicine, radiation protection, environmental monitoring, and radioactive source management. All calculations run locally in your browser to protect privacy.
Free online volumetric flow rate converter: supports bidirectional conversion between 4 flow units m³/h, m³/s, L/min, gal/min (US GPM), covering water pipe flow, pump flow, hydraulic systems, HVAC, pool water supply, chemical fluids and other scenarios, with local browser calculation for privacy protection.
Free online viscosity converter for Pa·s, mPa·s, and cP. Useful for lubricant, coating, adhesive, resin, and lab data sheets. Runs locally in your browser.
Free online temperature difference converter for Delta C, Delta F, and K. Useful for temperature rise checks, HVAC supply/return delta T, lab notes, and thermal troubleshooting. Runs locally in your browser.
Free online font size unit converter, supports instant conversion of pt, px, dp, sp, suitable for design draft delivery, CSS font size comparison and Android UI annotation organization. Currently, fixed reference relationship conversion is used, and all is done locally in the browser.
Free unit converter: 36 tools—length, weight, °C/°F, area, volume, hp, psi/bar. Metric/Imperial/Chinese. Quick here or dedicated pages. No signup, private.
