Smart Calculators

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Научни и инженерни калкулатори

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Тези калкулатори са налични на други езици — кликнете, за да ги видите.

Английски

Angle Converter

Convert between SI and historical plane-angle units (radian, milliradian, degree, gradian, turn, arcminute, arcsecond) anchored to the BIPM SI Brochure definition of the radian.

Английски

Area Converter

Convert between metric and imperial area units (square millimetre, square centimetre, square metre, hectare, square kilometre, square inch, square foot, square yard, acre, square mile) with NIST-grade exact factors.

Английски

Energy Converter

Convert between SI, electrical, and thermal energy units (joule, kilojoule, megajoule, watt-hour, kilowatt-hour, thermochemical calorie, IT calorie, kilocalorie, BTU, US therm, electronvolt) with NIST-grade exact factors anchored to the 2019 SI redefinition.

Английски

Force Converter

Convert between SI, gravitational, and CGS force units (newton, kilonewton, dyne, kilogram-force, tonne-force, pound-force, ounce-force, short-ton-force) with NIST-grade exact factors anchored to CGPM 1901 standard gravity.

Английски

Length Converter

Convert between metric, imperial, and astronomical length units (millimetre, metre, kilometre, inch, foot, yard, mile, nautical mile, ångström, light-year, AU, parsec) with NIST-grade exact factors.

Английски

Mass Converter

Convert mass between metric (kg, g, mg, tonne), avoirdupois (lb, oz, stone, short ton, long ton), troy ounce, grain, and the metric carat with NIST-grade exact factors.

Английски

Power Converter

Convert between SI and historical power units (watt, kilowatt, megawatt, mechanical horsepower, metric horsepower / PS, electric horsepower, BTU per hour, kilocalorie per hour, foot-pound per second). Disambiguates the three horsepower variants that vary by hundreds of watts.

Английски

Pressure Converter

Convert between SI, atmospheric, and gravitational pressure units (pascal, kilopascal, megapascal, bar, millibar, atmosphere, torr, mmHg, psi, kgf/cm², inH2O, cmH2O) with NIST-grade exact factors and conventional liquid-column values.

Английски

Temperature Converter

Convert between Celsius, Fahrenheit, Kelvin, Rankine, and Réaumur temperatures. Handles non-multiplicative scales correctly using the SI offset definition (0 °C = 273.15 K exactly, 13th CGPM 1967).

Английски

Torque Converter

Convert between SI and imperial torque units (newton-metre, kilonewton-metre, kilogram-force metre, kilogram-force centimetre, pound-foot, pound-inch, ounce-inch) with NIST-grade exact factors anchored to CGPM 1901 standard gravity and the 1959 international yard and pound.

Английски

Volume Converter

Convert between metric, US customary, and UK imperial volume units (millilitre, cubic centimetre, litre, cubic metre, cubic inch, cubic foot, cubic yard, US fluid ounce, US pint, US gallon, UK pint, UK gallon) with NIST-grade exact factors.

Английски

Конвертор на мерни единици

Convert between length, volume, area, temperature, pressure, energy, power, force, torque, and angle units with NIST-grade exact factors.

Предложение за калкулаторЗаявка за език

Science Calculators

Free science and engineering calculators with NIST-grade exact conversion factors. Built for engineers, physicists, mechanics, and students who need bit-exact unit conversions for spec sheets, lab work, and applied calculations.

Every factor is traceable to a primary source (NIST SP 811, BIPM SI Brochure, IYP 1959, CGPM 1901) and every pair of compatible units is tagged exact in the converter.

Force and Torque

Convert between SI, gravitational, and CGS units of force (newton, kilonewton, dyne, kilogram-force, tonne-force, pound-force, ounce-force, short-ton-force) and torque (newton-metre, kilonewton-metre, kilogram-force metre, pound-foot, pound-inch, ounce-inch, kilogram-force centimetre).

All factors anchor to the 1901 CGPM standard gravity (g_n = 9.80665 m/s² exact) and the 1959 International Yard and Pound Agreement (1 lb = 0.45359237 kg exact). Engineering precision is selectable from 0 to 15 decimals — bit-level for metrology, single-decimal for daily mechanic work.

What's Next

This category is expanding to cover pressure, energy, power, and temperature converters in upcoming releases. Each future tool will follow the same exactness contract: NIST-traceable factors, audience-laddered precision, and explicit naming-convention disambiguation (lb·ft vs ft·lb, US gal vs UK gal, °C vs K vs °F).

Frequently Asked Questions

An exact factor is one defined by an authoritative agreement rather than measured experimentally. NIST SP 811 Appendix B.8 prints exact factors in boldface; we mirror that convention with an (exact) badge on every pair where both endpoints are defined by exact rationals. Examples: 1 lb = 0.45359237 kg, 1 ft = 0.3048 m, g_n = 9.80665 m/s² are all exact.

Daily mechanic work: 1–2 decimals. Real-estate or general engineering: 4 decimals. Cadastral, aerospace, or fastener-tightening specs: 6–10 decimals. Metrology, lab calibration, or full-precision IEEE-754 traceability: 15 decimals. The precision selector applies only to display rounding — the underlying calculation is always full double precision.

Yes, all calculators are free with no sign-up required. Every tool runs entirely in the browser — your inputs never leave your device.