Four tools. One place to think.
Keep up to four calculators together. Change a value for an instant result, then send it to another calculator when you choose.
How to use the workspace ↓16 supported calculators · Inputs stay in this tab · Saved layouts contain tool names and order only
Discount Calculator
Calculate the final price and total savings after percentage and fixed discounts.
Formula & limits
Final price = original price × (1 − discount rate) − additional fixed discount, floored at zero.
Tax, shipping, minimum-spend rules, coupon order, and exclusions may change the checkout total.
Sales Tax Calculator
Estimate sales tax and the tax-inclusive total from a subtotal and tax rate.
Formula & limits
Tax = subtotal × tax rate; total = subtotal + tax.
Rates, taxable items, sourcing rules, and local surtaxes vary by jurisdiction; enter the rate applicable to the transaction.
Currency Converter
Convert an amount using an exchange rate and optional transaction fee you provide.
Formula & limits
Amount received = source amount × exchange rate × (1 − fee rate).
CalcMintly does not provide a live market rate; confirm the actual bank or payment-provider rate and spread.
Tip Calculator
Split a restaurant bill after adding a chosen tip percentage.
Formula & limits
Tip = bill × tip rate; per-person total = (bill + tip) ÷ number of people.
This version applies the tip to the entered bill and does not separately identify pre-tax and post-tax amounts.
How to use your calculator workspace
- Load a ready-made layout, or remove a calculator and add another. You can add the same calculator twice to compare scenarios.
- Replace the example values. Desktop shows a two-column grid; on phones, the numbered buttons switch calculators without losing inputs. Move cards with the arrows or drag handle.
- Under a result, choose another calculator and its destination field, then select Send result. Only the current unrounded number is copied. No unit conversion or ongoing synchronization happens automatically.
- Save my layout remembers calculator choices and order on this device. Refreshing loads fresh example values, not your previous inputs. Removing a card can be undone until you remove another or replace the layout.
Example: discount → tax → currency
In Shopping & bills, a price of 100 with a 20% discount and no extra discount gives 80. Send 80 to Sales Tax → Subtotal. At 10% tax the total is 88. Send 88 to Currency Converter → Amount, then enter your provider’s exchange rate and fee. With rate 1 and fee 0%, the result stays 88.
Choose compatible fields and use a consistent currency. Rates are entered by you, not fetched live. These are separate estimates; using calculators together does not make them a financial recommendation or a complete project plan. Open each calculator’s full guide for its formula and exclusions.