Free Online Calculators
Finance, health, date, and math calculators.
Fast, accurate calculators for everyday math, finance, health, and time. Each calculator shows its formula so you can verify and learn.
Problems calculators solve
- Calculating sale prices and the exact discount percentage during shopping
- Figuring out your precise age in years, months, and days for paperwork
- Adding or subtracting VAT/GST for invoices and receipts
- Computing profit margins and markups for product pricing
- Checking BMI and healthy weight range estimates
- Solving percentage-of and percentage-change problems quickly
Recommended calculators
Our most-used tools in this category — start here.
Percentage Calculator
Handle every percentage variant: of, change, increase, decrease
Discount Calculator
Instantly see sale price and money saved
Age Calculator
Exact age in years, months, weeks, and days
VAT Calculator
Add or remove VAT/GST at any rate with itemized breakdown
Profit Margin Calculator
Compute margin, markup, and profit from cost and price
All calculators (20)
Percentage Calculator
Calculate percentages three different ways.
Age Calculator
Calculate exact age in years, months, and days.
Discount Calculator
Calculate final prices after discounts.
VAT Calculator
Add or remove VAT from any amount.
BMI Calculator
Calculate body mass index.
Loan / EMI Calculator
Calculate loan EMI and total interest.
Date Difference Calculator
Find the gap between two dates.
Profit Margin Calculator
Calculate profit margins from cost and revenue.
Binary to Decimal
Convert binary numbers to decimal.
Decimal to Binary
Convert decimal numbers to binary.
Tip Calculator
Split the bill and calculate tips instantly.
Mortgage Calculator
Estimate monthly mortgage payments and total interest.
Random Number Generator
Generate cryptographically secure random numbers.
BMR Calculator
Calculate your Basal Metabolic Rate and TDEE.
Time Duration Calculator
Calculate the duration between two date-times.
Stopwatch
Millisecond-accurate stopwatch with lap times.
Countdown Timer
Set hours, minutes, and seconds — get an alarm at zero.
Pomodoro Timer
Cycle through work and break sessions automatically.
Pace Calculator
Convert between pace, distance, and time for any run or ride.
Body Fat Calculator
Estimate body fat percentage with the U.S. Navy method.
Who uses calculators?
- Shoppers checking real discount amounts
- Freelancers and small business owners pricing work
- Students handling math homework and conversions
- Accountants preparing quick invoice numbers
- Health-conscious users tracking BMI and metrics
- Event planners calculating ages and date differences
Read more on the blog
Tutorials and guides about calculators.
Frequently asked questions
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