Skip to content
CalcTortoise

Glossary

The terms used across our calculators, defined in a sentence or two, each linked to the calculator that uses it.

Annual equivalent rate (AER)
What a deposit earns in a year once compounding is counted. Term Deposit Calculator
Annual percentage rate (APR)
The yearly cost of a loan including most fees, used to compare offers. Personal Loan Calculator
CAGR
Compound annual growth rate: the steady yearly rate that turns a starting value into an ending value. CAGR Calculator
Compound interest
Interest earned on interest already added; the more often it is added, the faster savings grow. Compound Interest Calculator
Emergency fund
Savings set aside to cover essential spending if income stops — typically three to six months’ worth. Emergency Fund Calculator
FIRE
Financial independence, retire early: investing enough that withdrawals cover spending for life. FIRE Calculator
Instalment
The fixed amount repaid each month on a loan, covering interest and part of the capital. Loan Calculator
Loan-to-value (LTV)
The loan as a share of the property’s value. A lower LTV usually means a better rate. Home Affordability Calculator
Overpayment
Paying more than the required instalment, which reduces the interest and the term. Loan Overpayment Calculator
Real return
Return after inflation — the gain in what your money can buy. Inflation Calculator
Remortgage
Moving your mortgage to a new deal or lender, usually for a lower rate. Remortgage Calculator
Withdrawal rate
The share of a portfolio taken out in the first year of retirement. Withdrawal Calculator
XIRR
An annualised return for money invested at different times. XIRR Calculator