Finance tools: the complete guide
Most everyday money questions fall into a few groups: what a loan will cost you each month, how interest builds up on borrowing or savings, how an investment might grow, and how tax, VAT and discounts change a price. A dedicated calculator answers each one instantly, so you can compare options with real numbers instead of guesswork.
This guide is a map of the free finance tools and which one to reach for. Each runs instantly in your browser — no sign-up, no installs — so you pick the tool that matches your question and read off the answer.
Loans and EMI
The EMI calculator works out your fixed monthly installment from the loan amount, annual interest rate and tenure, plus the total interest you will pay — the formula is explained in how to calculate EMI. For a fuller repayment picture across different payment frequencies, the loan calculator breaks down total principal, total interest and total repayment.
Interest, savings and investment
The simple interest calculator handles flat interest on a principal, while the compound interest calculator shows how interest-on-interest compounds at any frequency. To plan ahead, the savings calculator projects how an initial deposit plus regular contributions grow over time, and the investment calculator estimates growth at an assumed rate of return (an estimate, not a guarantee).
Salary, VAT, discounts and profit
- Salary calculator — turn gross pay, allowances and deductions into net take-home pay.
- VAT calculator — add VAT to a net price or strip it out of a gross price at any rate.
- Discount calculator — find the sale price and exactly how much you save.
- Profit & loss calculator — get profit or loss amount and margin from cost and selling price.
- Percentage calculator — the quick everyday percentages behind all of the above.
Which tool for which question
| Your question | Reach for |
|---|---|
| What is my monthly loan payment? | EMI calculator |
| How much will my savings grow? | Savings calculator |
| What does compounding add over time? | Compound interest |
| What is my net take-home pay? | Salary calculator |
| What is the price after VAT? | VAT calculator |
Getting an accurate result
- Use the annual rate consistently. Enter interest as an annual percentage; the tools convert it to the right monthly or per-period figure for you.
- Match the compounding frequency. Monthly versus yearly compounding changes the total — set it to how the account actually works in the compound interest calculator.
- Treat projections as estimates. The investment calculator assumes a steady return; real markets vary, so use it to compare scenarios, not to promise an outcome.
Frequently asked questions
Are these finance tools free?
Yes. Every tool on the finance page is free and runs in your browser with no account required.
What is the difference between EMI and the loan calculator?
The EMI calculator focuses on the monthly installment, while the loan calculator gives the full repayment breakdown across the whole term and different payment frequencies.
Simple or compound interest — which should I use?
Use simple interest when interest is charged only on the original principal, and compound interest when interest is added back and earns further interest — the usual case for savings and most loans.
Browse all finance tools
Open the finance page to see the full set, or jump straight to the EMI, savings or VAT calculator if you already know what you need. For the wider maths toolkit, see the online calculators guide.
