Home › Tools › Add fractions › 3/16 + 3/16

3/16" + 3/16"

Adding two fractions of an inch, exactly — the everyday jobsite arithmetic that a decimal calculator gets wrong. Reduced, carried, and shown in millimetres.

3/16" + 3/16" =

=0-3/8"

Sum

0-3/8"

Decimal inch

0.375"

Millimetres

9.525 mm

3/16" − 3/16"

The work

Over a common denominator

Put both over 16: 3/16 = 3/16 and 3/16 = 3/16. Add the tops: 3/16 + 3/16 = 6/16. Reduced, that's 0-3/8" (0.375 inches). TapeMath tracks it as an exact fraction, so it lands dead on the tape mark.

Keep going

3/16" to decimal 3/16" to decimal All fraction sums Add it on the calculator

The same math, offline

Every calc, on your tape measure — even with no signal.

TapeMath for iPhone runs this exact engine offline, adds rafters, stairs, studs, pitch and a paperless tape, and the key layout your thumbs already know. $9.99 once — no subscription, ever.

See the app

Coming soon — TapeMath is in final App Review. Meanwhile, use the free web calculator →