Memo Calculator Pro - Tax, Tip

Memo Calculator Pro is a calculator that keeps your history and notes. Tax, discounts, receipts, bill splitting and unit price comparison live in one app, and every answer lands in the same history with a note, so you never wonder what a number was for.

Math runs on your device in exact decimals, so 0.1 + 0.2 is 0.3. Your expressions, history and notes stay on your device and are never sent anywhere; backups go only to a file you choose.

★ A calculator that shows the whole expression
Tap to place the cursor and fix one number. A gray preview shows the answer before you press =.
%, √, x², 1/x, ( ), ±, 00, M+ / M− / MR / MC and GT (grand total; long-press to clear). Press = again to repeat the last operation.
Choose standard order (× ÷ first) or as-pressed order like a desk calculator; a tag on the display shows which.
For "500 + 20%" the app shows how it read it ("500 × 1.2") under the answer.

★ +Tax and −Tax keys
Add or remove tax right on the keypad. Switch between a standard and a reduced rate (both editable) with the tag on the display, and see net and tax under the answer. Round tax down, half up or up.

★ History with notes
Answers from the keypad, tax, discount and unit price screens all go to one history. Add a note with "+ Note", pin what matters, search by word, filter by type and browse by day. See the total of what is shown, or pick rows and add up just those.
From any entry: use the answer, send the expression back to the keypad to edit it, copy or share. Deleted entries wait in the trash for 30 days. Noted, pinned and labeled entries are always kept, plus the newest 2,000 others.

★ Tax & discount tab
• Tax: add or remove tax at the standard, reduced or any rate
• Discount: stack up to six percent or amount discounts, or half price; add tax afterwards, or work out the percent off from a sale price
• Receipt: mark each item standard or reduced, and tax is rounded once per rate
• Split bill: people, tip, the unit you collect in, and whether the organizer covers the rest or everyone rounds up
Send any result to the calculator or save it to history.

★ Unit price: which is cheaper?
Enter up to 20 items and the app converts them to one unit, compares price per unit and marks the best value. It also shows how much more the others cost.
Weights in g, kg, mg, lb and oz, volumes in ml, L, fl oz and gal, plus pieces, length (m, cm) and sheets. Add pack counts ("2 packs of 6") and a discount per item, and switch the "per 100 g" or "per piece" base. Save the comparison to history or share it as text.

★ Calc notes
A notepad that calculates line by line. Write "apples 120×3" and the answer appears at the right of the line, with the total at the bottom. Labels and currency signs are skipped, a trailing "=" is ignored and "x" between numbers multiplies. Keys for + − × ÷ ( ) % sit above the keyboard.

★ Display and settings
Decimal places and rounding, digit grouping (1,234,567, thin spaces or Indian 12,34,567), and a period or comma decimal mark. Only the display is rounded; calculations keep every digit. Light or dark theme. Back up settings, history and notes to one file and restore them on a new phone. A home screen widget shows your latest answer, and a Quick Settings tile opens the calculator.

★ Premium: one-time purchase
The core app is free with no time or usage limit. Premium is unlocked with a single purchase, NOT a subscription. It adds:
• More calc notes, named values ("rate = 1.1"), "#3" to use line 3's answer, and total / subtotal lines
• Price book: log unit prices with store and date, and compare with the lowest price for the same item
• Profit and withholding: margin, markup, selling price, withholding and net payout
• Effective price after points back
• 20 named memories (long-press MR or M+)
• History CSV export, color labels and color themes
Premium screens open before you buy, so you can try them with example values.