payment = P(r⁄12) ⁄ (1 − (1 + r⁄12)^(−12n))
Loan Payment Calculator: Monthly Repayment
Estimate a monthly loan payment from principal, annual rate and term in years. Prefilled example included — edit the values and press Evaluate.
OpenOnline calculators for loans, tips and equations
A formula is only as good as its inputs. Each calculator below shows the expression it uses, starts with an example you can edit, and reveals the result only once you press Evaluate.
All calculators
share = bill × (1 + tip) ÷ people
Tip & Bill Split Calculator
Split a bill plus a percentage tip across any number of people. Prefilled at 184.50 with 12% for 5 — edit the values and press Evaluate.
Open
x = (−b ± √(b² − 4ac)) ⁄ 2a
Quadratic Formula Calculator: Solved Step by Step
Solve a quadratic equation step by step. Prefilled with x² − 5x + 6 — change the coefficients and press Evaluate.
OpenKnow what the formula assumes
Every calculator lists its assumptions — fixed rates, even splits, chosen units — so you can tell whether the arithmetic fits your situation before you rely on a figure.
Check the result by substitution
Put the answer back into the original problem. This catches sign errors and wrong units much faster than a second pass of the same calculation.
Numbers are rarely exact
Results are rounded for display while intermediate steps keep full precision. Where money or measurements are involved, your inputs carry the uncertainty.
Common questions
Are these financial calculators advice?
No. They illustrate arithmetic only and do not account for fees, taxes, insurance or rate changes. Confirm real offers with the relevant provider.
Why does the result wait for a button press?
So you always know which inputs produced the number you are looking at. Change an input and the result hides again until you confirm.
These pages describe how each figure is produced and what it excludes. They do not cover every convention or individual circumstance — check important results independently.