Span64 Construction Calculator

Exact feet-inch-fraction construction calculator for the jobsite. The calculator is free; one purchase unlocks all seven Tools for good. No subscription, no ads, no account.

Span64 is a carpenter calculator and contractor calculator built for carpenters, framers, contractors and serious DIYers. Type full equations in feet, inches and fractions, read stacked fractions clearly, and keep every result on a Tape you can reuse, annotate and share.

FEET AND INCHES CALCULATOR, FREE
• Add, subtract, multiply and divide feet, inches and fractions down to 1/64"
• Mix imperial and metric: type 2.54 m + 635 mm and read the answer in feet-inch
• Fraction calculator with 1/2, 1/4, 1/8 and 1/16 keys
• Persistent Tape with notes, so a measurement taken in the morning is still there after lunch
• Home screen widget with your latest result
• Works offline on the jobsite

SPAN64 PRO: SEVEN JOBSITE TOOLS, ONE-TIME UNLOCK
• Stair calculator: risers, treads, run, stringer length and code checks
• Rafter calculator: roof pitch, common rafters, hip and valley, and the birdsmouth cut
• Concrete calculator: slabs in cubic yards, cubic meters and bags
• Board feet calculator: lumber per piece, total and cost
• Stud calculator: on-center layout marks and stud count for framing
• Right-angle / triangle calculator: rise, run, diagonal and pitch for squaring and layout
• Area and volume calculator: rectangles, circles, boxes and cylinders, plus square footage

Preview every Tool with your own measurements before you buy. A single purchase reveals the results and unlocks all seven Tools permanently. There is no trial countdown, no subscription and no Span64 account. Restore your purchase from Settings at any time.

WHY TRADES USE SPAN64
• Exact math: the engine works in whole 1/64ths, so 5'8" + 3'7-1/2" is 9'3-1/2", every time
• Built for gloves and sunlight: large keys, high contrast, a focused screen per job
• A construction calculator that pays once: no ads between cuts, no renewal to remember
• Your data stays yours: measurements, Tape entries and notes never leave your phone

Purchasing or restoring Span64 Pro needs a network connection and Google Play to verify ownership. Optional analytics are off by default and never include your calculations.

Span64 is a calculation aid. Verify measurements, structural decisions and local code requirements before cutting or building.