The feet-inch-fraction calculator with the key layout tradesmen already trust — full rafter, stair, and pitch functions, exact fraction math, no login, no subscription.
The keys sit where your thumbs expect them. Feet, inch, fraction, and the trade functions — one row, safety yellow.
The whole category flipped. A trial that expires mid-measure, a login every time you open it, a bill every April for math that hasn't changed since the tape measure. TapeMath is what a tool is supposed to be: buy it once, it works forever — and it works in a basement with no signal, on a jobsite with no bars.
12' 6-3/16" ÷ 3 is exact — never 4.1770833. Rational arithmetic under the hood, checked against 150+ published worked examples.
Rafters — common, hip, valley, jack. Stairs. Studs on-center. Board feet. Pitch conversions. The keys are right where you reach for them.
Every calc logged and scrollable. Tap a line to recall it. Text the whole cut list to the crew before you climb down.
Big glove-friendly targets. A haptic thump on every keypress — you feel the key on a loud site. Works fully offline.
The subscription calculator apps rent you the layout you already know. TapeMath sells it to you — once — and then it's yours.
| The subscription apps | TapeMath | |
|---|---|---|
| Pay once | × | ✓ |
| Works offline | × | ✓ |
| No login | × | ✓ |
| Rafter + stair keys | ✓ | ✓ |
| Exact fraction math | ✓ | ✓ |
| Price | $39.99 / year + login every use |
$9.99 once |
The trade keys are table stakes — everyone has them. The only line that really moves is the one at the bottom.
A tape measure doesn't have a monthly fee.Why TapeMath is buy-once
Neither should the math.