Calculators
Age Calculator
Age Calculator can accurately calculate your exact age based on your birthday. Years, months, and days will be presented as the determined age.
15 Free Tools
Calculators
Instant answers for the numbers that come up in real life — mortgages, BMI, tax, margins, marketing spend, and everyday math, all calculated in your browser.
Some numbers you shouldn't have to work out by hand — a monthly mortgage payment, a profit margin, an ad campaign's cost per thousand.
This collection turns those repeat calculations into one-field-at-a-time tools that answer instantly as you type.
Every calculator runs on your device, so nothing you enter is sent anywhere.
Calculators
Percentage Calculator
Free online percentage calculator. Work out what X% of Y is, what percent one number is of another, percentage increase, decrease, and change live in your browser.
Calculators
Date Difference Calculator
Free online date difference calculator. Find the time between two dates in years, months, and days, plus total days, weeks, hours, and minutes in your browser.
Calculators
Loan Calculator
Free online loan and EMI calculator. Enter loan amount, interest rate, and term to see your monthly payment, total interest, and full amortization schedule in your browser.
Calculators
Aspect Ratio Calculator
Free aspect ratio calculator to find proportional width and height for 16:9, 4:3, 21:9, 1:1, 9:16, or custom ratios, plus a GCD ratio simplifier and live preview.
Calculators
BMI Calculator
Free online BMI calculator. Enter your weight and height in metric or imperial units to see your Body Mass Index, weight category, and healthy weight range in your browser.
Calculators
Mortgage Calculator
Free online mortgage calculator. Enter home price, down payment, rate, and term to estimate your total monthly payment including principal, interest, tax, insurance, and HOA.
Calculators
Sales Tax Calculator
Free online sales tax calculator. Add tax to a net price or extract tax from a gross total, and see the tax amount and totals instantly in your browser.
Calculators
Gross Margin Calculator
Free online gross margin calculator. Enter cost and price, or cost and a target margin, to see gross profit, gross margin percent, and markup percent instantly.
Calculators
Hourly Rate Calculator
Free hourly rate calculator for freelancers. Enter your target income, billable hours, working weeks, expenses, and overhead to find the rate you need to charge.
Calculators
ROAS Calculator
Free online ROAS calculator. Enter ad revenue and ad spend to see your return on ad spend as a multiple and a percentage, plus ROI and break-even ROAS.
Calculators
CPM Calculator
Free online CPM calculator. Solve for cost per mille, total cost, or impressions from the other two values, with live results in your browser.
Calculators
Crypto Profit Calculator
Free crypto profit calculator. Enter buy price, sell price, quantity, and optional fees to see your total invested, total returned, net profit or loss, and ROI.
Calculators
Fuel Cost Calculator
Free fuel cost calculator. Enter trip distance, fuel efficiency, and fuel price in any units to estimate the fuel needed and total cost, one way or round trip.
Calculators
Download Time Calculator
Free download time calculator. Enter a file size and connection speed to estimate how long a download will take, in a clear human-readable format.
Money and finance
The big financial questions get their own tools. The Mortgage Calculator works out monthly payments including taxes and insurance, and the Loan Calculator handles any amortized loan with a full schedule.
For quick everyday math, the Percentage Calculator covers increases, decreases, and "what percent of" in one place.
Business and marketing
Running numbers for a business or a campaign? The Gross Margin Calculator turns cost and price into margin and markup, while the ROAS Calculator and CPM calculator measure ad performance.
Freelancers can set a sustainable rate with the Hourly Rate Calculator, working backward from a target income.
Health and everyday life
Not every calculation is about money. The BMI Calculator checks body mass index in metric or imperial units, and the fuel cost and download time calculators answer the small practical questions of daily life.
Each tool shows its formula, so you can see exactly how the answer was reached.
Good to know
Frequently Asked Questions
Are these calculators free?
Yes, every calculator is free with no account, no limits, and no ads interrupting the result.
Do the calculations happen on my device?
Yes. Each calculator runs entirely in your browser, so the figures you enter are never uploaded or stored.
Are the financial calculators a substitute for professional advice?
No. Tools like the mortgage and loan calculators give solid estimates for planning, but they exclude some fees and are not financial advice. For major decisions, consult a professional.
Can I use metric and imperial units?
Where it matters — such as the BMI calculator — you can switch between metric (kg, cm) and imperial (lb, ft/in) units.
Keep exploring