CALC-IT calculator

1. Tap 6 → Feet → 7 → 1/2 → Inches → +.
2. Tap 3 → Feet → 2 → 5/8 → Inches → =. The result is 9' 10 1/8", with both measurements in the tape.
3. For another dimension, tap + or −, enter it, then =. To scale the result, tap × or ÷ and enter a plain number.
4. Use Edit to correct a step, CE to clear an entry, or AC to start over. After =, typing a new value starts a new calculation; tapping an operator continues from the result.

Memory: keep one value while calculating another

Tap M to open memory controls. MS stores the current entry, or the result if the entry is empty. M+ adds it to memory; M− subtracts it. MR recalls the stored measurement into the entry; press = to use it. MC clears memory. AC and CE keep memory. Memory holds measurements, so recall with + or −; enter a plain number for × or ÷.

1. Enter 37 → Feet → 1 → Inches, then M → MS. Memory shows 37' 1".
2. Tap AC. Enter 25 → Feet → × → 7 → =. The result is 175' 0"; memory still holds 37' 1".
3. Tap M → M+. Memory becomes 212' 1", while the result stays 175' 0".
4. Tap AC → M → MR → = to bring back 212' 1". Use total applies it to a tool field. Tap M → MC when finished.

Without Feet, 25 × 7 gives 175 inches (14' 7"). Decimal inches and feet appear under the result; fractions stay exact in the calculation and memory. The tape and memory save in this browser and sync between CALC-IT tabs. Applied tool values change only when you choose Use total.

1. Choose Standard. Enter a number with the keypad or type decimals, signed numbers or fractions.
2. Tap +, −, × or ÷, enter the next number, then =. Calculations run in the order entered. Use ± to change an entry’s sign. For + or −, % calculates a percentage of the running total; otherwise it divides the entry by 100.
3. CE clears the entry; AC clears the calculation. Both keep memory. Tap M for MS (store), MR (recall), M+ (add), M− (subtract), or MC (clear memory).
4. Switch to Feet & inches for measurements. Each mode keeps its own tape, entry and memory; numbers are not converted into lengths.

Worked example: 25 × 7 = 175

Tap 2 → 5 → × → 7 → =. The result is 175, with no units. For a percentage, 200 → × → 10 → % → = gives 20. 1/3 + 1/6 = 0.5; fractions are calculated exactly.

Square root and fractions

Enter 81 → √ to get 9. You can also tap √ after = to take the square root of the displayed result. With a pending operation, √ calculates the current entry and finishes that step. Negative values produce an error and keep your calculation. Perfect square roots remain exact; other roots are rounded to 12 decimal places, marked ≈, and use that rounded value in later calculations and memory.

The Fraction key (previously labeled a/b) enters the slash: 1 → Fraction → 2 gives 1/2. Use ÷ for division. For a mixed fraction, type 2 1/2 or tap 2 → 1/2.

Memory example

Enter 37.1 → M → MS → AC. Calculate 25 × 7 = 175, then tap M → M+. Memory becomes 212.1. Tap AC → M → MR → = to bring it back. Standard memory and builder memory stay separate and sync with the matching mode in your other CALC-IT tabs. Decimal results display up to 12 places; the exact fraction is shown when needed.