Free Online Calculators for Money, Health and Everyday Maths
CalcSolverPro gives you ten fast, free calculators for loans, mortgages, savings, BMI, calories, percentages and more. Every page prints the formula and a worked example, so you can check the answer yourself. No sign-up, and your numbers never leave your browser.
Browse all calculators Loan EMI calculator
- 10 free calculators
- No sign-up
- Private: runs in your browser
- Formula and worked example
Try it now: percentage calculator
Enter your numbers to see the result.
Browse online calculators by category
Pick a category to see every calculator in it, or go straight to the tool you need.
Finance calculators
Plan borrowing, saving and pricing with four finance calculators. Each one shows its formula and a worked example, so you can check the figures yourself before you commit to a loan, an investment or a price.
- Loan EMI Calculator Enter the amount you want to borrow, the yearly interest rate and the loan term. You get the mo...
- Mortgage Calculator Enter the home price, your down payment, the interest rate and the term. Add yearly property ta...
- Compound Interest Calculator Enter a starting balance, a monthly contribution, the yearly rate and how long you will invest...
- Profit Margin Calculator Enter what an item costs you and what you sell it for. You get gross profit, gross margin and m...
Health calculators
Check your body mass index and estimate how many calories your body uses each day. Both are screening tools, and each page explains what the number leaves out.
Everyday calculators
Quick answers for the sums that come up every week: percentages, sale prices, restaurant bills and exact age in years, months and days.
- Percentage Calculator Work out a percentage of a number, find what percent one value is of another, or measure the pe...
- Age Calculator Pick a date of birth and, if you like, a different date to measure to. The calculator returns e...
- Discount Calculator Enter the original price and the percentage off. Add a second discount if the store stacks offe...
- Tip Calculator Enter the bill, choose a tip percentage and say how many people are sharing. The calculator sho...
How to get a reliable answer in three steps
- Pick the calculator that matches your question. Not sure which one? The guide below sorts them by what you are trying to do.
- Type your numbers. Results update as you type, so you can change one input and watch the effect straight away. Try a longer loan term or a bigger deposit and compare.
- Check the working. Every page prints the formula and a full example. If an answer looks odd, the example shows you how to verify it with a pencil or a spreadsheet.
Which calculator do you need?
Borrowing money. Start with the loan EMI calculator for personal and car loans, or the mortgage calculator if you are buying a home and want tax and insurance in the monthly figure. More tools are in our finance calculators.
Saving and pricing. The compound interest calculator shows how a starting balance and monthly deposits build over time. Selling something? The profit margin calculator separates margin from markup so you price correctly.
Health numbers. Check your body mass index and estimate daily energy needs with the calorie calculator. Both are screening tools, not diagnoses. See all health calculators.
Everyday questions. Use the percentage calculator for quick maths, the discount calculator before you buy, the tip calculator when you split a bill, and the age calculator for exact dates. They are all in our everyday calculators.
Formulas at a glance
Nothing on this site is a black box. This is the core formula behind each calculator, and every linked page explains the symbols and works through an example.
| Calculator | Core formula |
|---|---|
| Percentage Calculator | A ÷ 100 × B |
| Loan EMI Calculator | P × i × (1 + i)n ÷ ((1 + i)n − 1) |
| Mortgage Calculator | Loan repayment formula, plus yearly tax ÷ 12 and insurance ÷ 12 |
| Compound Interest Calculator | P × (1 + r/n)nt, plus monthly deposits |
| Profit Margin Calculator | (Price − cost) ÷ price × 100 |
| BMI Calculator | kg ÷ m2, or 703 × lb ÷ in2 |
| Calorie Calculator | Mifflin-St Jeor BMR × activity factor |
| Age Calculator | Target date minus birth date, in years, months and days |
| Discount Calculator | Price × (1 − d1) × (1 − d2) × (1 + tax) |
| Tip Calculator | Bill × tip % ÷ 100, then split by people |
Who uses these calculators
Students use the percentage and age calculators to check homework and work out grades or eligibility dates. The worked examples show each step, so you learn the method and not only the answer.
Shoppers and borrowers compare offers. Running two loans or two discounts through the calculators makes the real cost visible before you sign or pay.
Small business owners use the profit margin and discount calculators to set prices that still leave room above cost, especially during sales.
Anyone tracking their health can use the BMI and calorie calculators as a starting point for a conversation with a doctor or dietitian.
Five calculation mistakes worth avoiding
Treating percentage change as symmetric. A price that drops from 100 to 50 fell by 50%, but it must rise by 100% to recover. The percentage calculator has a change mode that gets this right.
Ignoring the interest method. Two loans can both advertise 8% yet cost very different amounts if one is flat rate and the other is reducing balance. Our EMI calculator uses reducing balance, so ask your lender which one they quote.
Adding stacked discounts. The second discount applies to the already reduced price, so 20% then 10% saves 28%, not 30%. The discount calculator has a field for the second offer.
Mixing up margin and markup. A 40% markup gives a margin of about 28.6%, not 40%. The profit margin calculator shows both.
Reading a screening number as a verdict. BMI cannot see muscle, and calorie estimates vary by several hundred a day between people. Use both as starting points, and choose the lower activity level if you are unsure.
Why you can trust CalcSolverPro
Every calculator uses a standard, published formula. We print it on the page, work through an example with real figures, and say what the result leaves out. If a loan estimate ignores fees or a BMI result cannot see muscle, the page tells you so.
The calculations run in your browser with plain JavaScript, with no account to create and nothing uploaded. That keeps the tools quick and keeps your salary, weight and loan details with you.
Results are estimates for planning and learning. For decisions about borrowing, investing or your health, check the figures with a qualified professional. Read more on the about page and in our disclaimer.
Latest guides
How loan interest really works: a worked example
See where the interest on a loan comes from and how the term changes what you pay, with figures you can check.
Frequently asked questions
Are the calculators on CalcSolverPro free?
Yes. Every calculator is free to use with no account, no sign-up and no limit on how many times you run it.
Is my data stored or sent anywhere?
No. All calculations run in your web browser. The numbers you type, such as loan amounts or your weight, are never sent to our servers.
How accurate are the results?
Each calculator uses a standard, published formula and shows it on the page, with a worked example you can check by hand. Results are estimates for planning and learning, so confirm important figures with a qualified professional.
What is the difference between a loan EMI and a mortgage payment?
An EMI covers principal and interest. A mortgage payment often adds property tax and home insurance, which is why the mortgage calculator has fields for both.
What is the difference between flat-rate and reducing-balance interest?
Flat-rate interest is charged on the original loan amount for the whole term. Reducing-balance interest is charged only on what you still owe, so it costs less at the same quoted rate. Our EMI calculator uses reducing balance.
Which calculators are available?
There are ten calculators in three categories. Finance: loan EMI, mortgage, compound interest and profit margin. Health: BMI and calorie. Everyday: percentage, age, discount and tip.
Do the calculators work on my phone?
Yes. The layout adapts to any screen size, pages load quickly on mobile connections, and there is nothing to install.
Is BMI a reliable measure of health?
BMI is a quick screening number. It cannot tell muscle from fat, so use it as a starting point and speak to a doctor for advice about your health.
Can I rely on the results for official or professional decisions?
Treat them as estimates. Confirm important figures with your lender, accountant, tax adviser or doctor before you act on them.
How do I report a mistake or ask for a new calculator?
Use the contact page. Corrections are checked against the formula shown on the calculator page and fixed as soon as they are confirmed.