Formula calculator that remembers your math: VAT, profit, discount & tips.
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Tired of redoing the same calculations and forgetting how you got the answer?
Calc Memo is a calculator that remembers. Every calculation is saved automatically, and you can turn any calculation into a reusable formula — so next time you just type the new numbers and get the answer instantly.
Why Calc Memo
• Save any calculation as a formula you can reuse forever
• Every result is kept in a searchable history, so you never lose your work
• Pin your most-used formulas right under the keypad
• Exact decimal math — no floating-point rounding errors
• Clean, fast, distraction-free design
Ready-made formulas
Get started in seconds with built-in presets you can edit:
• VAT — add or remove VAT
• Withholding tax
• Profit after fees, markup and margin
• Price after discount
• Tip and split the bill
• Overtime pay
• Hourly rate to project price
(Rates are editable defaults and are meant as estimates, not tax advice.)
Made for
Small business owners, online sellers, freelancers, and anyone who runs the same numbers again and again — pricing, invoices, quotes, bills, and everyday math.
Private by design
• Works fully offline — no internet needed to calculate
• Your data stays on your device — no account, no sign-up
• No ads, no tracking, no analytics
• Export and import your own backup file whenever you want
5 languages
Thai, English, Chinese (中文), Japanese (日本語), and Bahasa Indonesia — with region-aware currency and number formats.
Free to use. If Calc Memo saves you time, you can leave a small tip to support development — but every feature stays free.
Calculate once, reuse forever. Download Calc Memo and stop recalculating the same things.