Unit converter and calculator

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You may say 'convert x to y', where x and y are any compatible expressions.
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Comments start with % and continue to the end of the line.
You may prefix constants and variables with multipliers: 
	P peta-
	T tera-
	G giga-
	M mega-
	k kilo-
	h hecto-
	d deci-
	c centi-
	m milli-
	μ micro-
	n nano-
	p pico-
	f femto-
Known constants
	A: 1 A  ()
	Btu: 1055.05585 kg m^2/s^2  (British thermal unit)
	C: 1 s A  (Coulomb)
	F: 96485.3365 s A/mol  (Faraday constant)
	G: 6.67384e-11 m^3/(kg s^2)  (gravitational constant)
	Gy: 1 m^2/s^2  (Gray)
	H: 1 kg m^2/(s^2 A^2)  (Henry)
	Hz: 1/s  (Hertz)
	J: 1 kg m^2/s^2  (Joule)
	K: 1 °K  ()
	L: 6.02214e+23/mol  (Avogadro's number)
	N: 1 kg m/s^2  (Newton)
	Pa: 1 kg/(m s^2)  (Pascal)
	R: 8.314 kg m^2/(s^2 mol °K)  (gas constant)
	Rvalue: 1 s^3 °K/kg  (R value)
	Rvalue_US: 0.176110184119637 s^3 °K/kg  (US R value)
	S: 1 s^3 A^2/(kg m^2)  (Siemens)
	Sv: 1 m^2/s^2  (Sievert)
	Tbsp: 1.478676478128e-05 m^3  (tablespoon)
	Ts: 1 kg/(s^2 A)  (Tesla)
	V: 1 kg m^2/(s^3 A)  (Volt)
	W: 1 kg m^2/s^3  (Watt)
	Wb: 1 kg m^2/(s^2 A)  (Weber)
	acre: 4046.8564224 m^2  (acre)
	arshin: 0.7112 m  (арши́н)
	bbl: 0.119240471196242 m^3  (barrel)
	berkovets: 163.806872 kg  (берковец)
	bochka: 0.4919764 m^3  (бо́чка)
	bu: 0.035239072 m^3  (bushel)
	butylka_vinnaya: 0.000768713125 m^3  (буты́лка_ви́нная)
	butylka_vodochnaya: 0.0006149705 m^3  (буты́лка_во́дочная)
	c: 299792458 m/s  (speed of light)
	cal: 4.18409 kg m^2/s^2  (calorie)
	cb: 219.456 m  (cable)
	cc: 1e-06 m^3  (cubic centimeter)
	cd: 1 cd  ()
	ch: 20.1168 m  (chain)
	charka: 0.0001229941 m^3  (ча́рка)
	chast: 0.000109328066666667 m^3  (часть)
	chetverik: 0.026238736 m^3  (четвери́к)
	chetvert: 0.209909888 m^3  (че́тверть)
	cp: 0.00023658823650048 m^3  (US cup)
	cwt: 45.3592 kg  (US hundredweight)
	day: 86400 s  (day)
	degF: 0.555555555555556 °K  (Δ degrees Fahrenheit)
	desiatina: 10925.397504 m^2  (десяти́на)
	dolia: 4.44354578993056e-05 kg  (до́ля)
	dr: 0.00177184375 kg  (dram)
	dry_bbl: 0.115619395232 m^3  (dry barrel)
	dry_gal: 0.004404884 m^3  (dry gallon)
	dry_pt: 0.0005506105 m^3  (dry pint)
	dry_qt: 0.001101221 m^3  (dry quart)
	duiym: 0.0254 m  (дюйм)
	dunam: 1000 m^2  (dunam)
	e: 1.60217690887293e-19 s A  (electron charge)
	fldr: 3.69669119532e-06 m^3  (fluid dram)
	floz: 2.957352956256e-05 m^3  (fluid ounce)
	ft: 0.3048 m  (foot)
	ftm: 1.8288 m  (fathom)
	funt: 0.40951718 kg  (фунт)
	fur: 201.168 m  (furlong)
	fut: 0.3048 m  (фут)
	g: 0.001 kg  ()
	gal: 0.00378541178400768 m^3  (US gallon)
	garnets: 0.003279842 m^3  (га́рнец)
	gi: 0.00011829411825024 m^3  (US Gill)
	gr: 6.47988571428571e-05 kg  (grain)
	h: 6.62606957e-34 kg m^2/s  (Planck constant)
	hectare: 10000 m^2  (hectare)
	hogshead: 0.238480942392484 m^3  (hogshead)
	hp: 745.699872 kg m^2/s^3  (horsepower)
	hr: 3600 s  (hour)
	in: 0.0254 m  (inch)
	jig: 4.436029434384e-05 m^3  (jigger)
	k_e: 8987551000 kg m^3/(s^4 A^2)  (Coulomb constant)
	kat: 1 mol/s  (katal)
	kruzhka: 0.001229941 m^3  (кру́жка)
	l: 0.001 m^3  (liter)
	lb: 0.453592 kg  (pounds of mass)
	lbF: 4.44822 kg m/s^2  (pounds of force)
	lea: 4828.032 m  (league)
	liniya: 0.00254 m  (ли́ния)
	lot: 0.012797411875 kg  (лот)
	m: 1 m  ()
	mi: 1609.344 m  (mile)
	milia: 7467.6 m  (ми́ля)
	min: 60 s  (minute)
	minim: 6.1611519922e-08 m^3  (minim)
	mol: 1 mol  ()
	molal: 1 mol/kg  (molal)
	nmi: 1852.354944 m  (nautical mile)
	osmina: 0.104954944 m^3  (осьми́на)
	oz: 0.0283495 kg  (ounce)
	peck: 0.008809768 m^3  (peck)
	piad: 0.1778 m  (пядь)
	pood: 16.3806872 kg  (пуд)
	pt: 0.00047317647300096 m^3  (US pint)
	qt: 0.00094635294600192 m^3  (US quart)
	rd: 5.0292 m  (rod)
	s: 1 s  ()
	sazhen: 2.1336 m  (са́жень)
	shkalik: 6.149705e-05 m^3  (шка́лик)
	shtof: 0.001229941 m^3  (штоф)
	slug: 14.5938976377953 kg  (slug)
	stone: 6.350288 kg  (British/Irish stone)
	tochka: 0.000254 m  (то́чка)
	ton: 907.184 kg  (US ton (short ton))
	tsp: 4.92892159376e-06 m^3  (teaspoon)
	twp: 93239571.972096 m^2  (township)
	vedro: 0.01229941 m^3  (ведро́)
	vershok: 0.04445 m  (вершо́к)
	versta: 1066.8 m  (верста́)
	yd: 0.9144 m  (yard)
	zolotnik: 0.00426580395833333 kg  (золотни́к)
	Å: 1e-10 m  (Angstrom)
	Ω: 1 kg m^2/(s^3 A^2)  (Ohm)
	π: 3.1415926535  (pi)
	ℏ: 1.05457172536643e-34 kg m^2/s  (Dirac constant)