Some calculations are simple in principle and still worth outsourcing — not because they're hard, but because getting them wrong (a missed unit conversion, a miscalculated loan payment) has real consequences and doing them by hand invites small mistakes.
Converting between units without memorizing conversion factors
Length, weight, area, volume, speed and data storage each have their own set of conversion factors that nobody keeps memorized across all of them. The Unit Converter covers metric and imperial units across all of these in one place.
Understanding what a loan actually costs over time
A loan's monthly payment number alone hides the total interest paid over the loan's life — sometimes a substantial amount that's easy to overlook when only comparing monthly payments. Loan Calculator breaks down the full amortization schedule.
Salary numbers rarely mean what they first appear to
A quoted salary figure and the amount that actually lands in a bank account are two different numbers once deductions are applied. Salary Calculator converts between gross and net using a custom rate, so an offer or paycheck can be understood in real terms.
Discount math is simple until there are multiple discounts
A single percentage discount is easy to calculate mentally; stacked discounts or figuring out the original price from a sale price is where mental math starts producing wrong answers. Discount Calculator handles both directions cleanly.
All four are pure calculations that happen instantly in your browser — no data about your finances is stored or transmitted anywhere.
