Money maths goes wrong in predictable places: tip percentages calculated on the wrong base, discounts stacked in the wrong order, rent charged for days you did not live somewhere, future money treated as if it were worth the same as money today. These calculators exist to get those specific sums right, with the working visible.
There is no account, no spreadsheet to build and no data stored — enter the numbers, get the answer, and close the tab. Start with the group that matches your question below.
Which finance calculator do you need?
At the table, it is the tip calculator — tip, tax and an exact split where the shares always add up. At the till, the discount calculator shows the real price after one discount or several stacked. For bigger decisions, the NPV calculator values a stream of future payments in today’s money, and the time value of money calculator projects growth or present value with compound interest. Moving house mid-month? The prorated rent calculator works out the partial month fairly. Freelancers: the invoice generator produces a clean PDF invoice with no account.
Everyday Money
The sums from daily life — tips, splits and sale prices — answered in seconds at the table or the till.
Tip Calculator
Tip, tax and bill split — shares add up exactly.
Discount Calculator
% off and $ off sale prices — final price and savings, live.
Business & Property Finance
Investment value, rent for partial months and client-ready invoices for freelancers, landlords and analysts.
Invoice Generator
Create a clean PDF invoice as a freelancer — free, no account.
NPV Calculator
Net present value of investments.
Time Value of Money Calculator
Future & present value, compound growth.
Prorated Rent Calculator
Partial-month rent for move-in & move-out — daily rate shown.