Home › Tools › Add fractions › 7/16 + 9/16

7/16" + 9/16"

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

7/16" + 9/16" =

=1"

Sum

Decimal inch

Millimetres

25.4 mm

7/16" − 9/16"

-0-1/8"

The work

Over a common denominator

Put both over 16: 7/16 = 7/16 and 9/16 = 9/16. Add the tops: 7/16 + 9/16 = 16/16. Reduced, that's 1" (1 inches). TapeMath tracks it as an exact fraction, so it lands dead on the tape mark.

Keep going

7/16" to decimal 9/16" 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 →