Calculators
BMI Calculator
Calculate body mass index from height and weight in metric or imperial units, with category and healthy weight range.
Open toolTool categories
Calculators
Clean form-based calculators for the numbers people work out every day. Every calculator accepts free input, validates the values, and shows a readable result card with the reasoning behind the answer. All math runs locally on your device.
15active tools
Who it is for
Who it is for
Calculators help students checking grades and GPA, shoppers comparing discounts, borrowers estimating monthly payments, and anyone tracking health metrics or planning a budget. Results compute locally with the formula shown on the page.
What you can do here
What you can do here
- Calculate percentages, increases, and discounts
- Estimate loan and mortgage payments
- Check BMI and other health metrics
- Work out grades and final exam scores
- Split bills and tips fairly
- Find date, time, and duration differences
Featured tools
Featured tools
Calculators
Percentage Calculator
Calculate percentages three ways: X percent of Y, X as a percentage of Y, and the percent change between two values.
Open toolCalculators
Loan and Mortgage Calculator
Calculate monthly loan payments, total interest, and payoff time, with an optional extra payment comparison.
Open toolCalculators
Mortgage Payment Calculator
Estimate monthly mortgage payments from home price and down payment, with total interest and total cost.
Open toolA practical connected workflow
A practical connected workflow
Enter a value or file, let the browser do the work, and download or copy the result.
- 1Add your input
- 2Choose the options
- 3Review the result
- 4Download
Built for repeat daily work
Every active tool includes a working interface, clear instructions, examples, privacy details, limitations, and direct links to related tasks.
Data processing noticeAll tools in this category
All tools in this category
Calculators
Percentage Calculator
Calculate percentages three ways: X percent of Y, X as a percentage of Y, and the percent change between two values.
Open toolCalculators
Tip Calculator
Calculate tips and split bills: tip amount, total with tip, and per-person share for groups of any size.
Open toolCalculators
BMI Calculator
Calculate body mass index from height and weight in metric or imperial units, with category and healthy weight range.
Open toolCalculators
Age Calculator
Calculate exact age in years, months, and days from a birth date, with total days, weeks, and the next birthday countdown.
Open toolCalculators
Date Difference Calculator
Find the exact number of days, weeks, months, and calendar years between any two dates.
Open toolCalculators
Discount Calculator
Calculate final prices after percentage or fixed-amount discounts, with savings and effective discount shown.
Open toolCalculators
Loan and Mortgage Calculator
Calculate monthly loan payments, total interest, and payoff time, with an optional extra payment comparison.
Open toolCalculators
GPA Calculator (4.0 Scale)
Calculate a credit-weighted GPA on the 4.0 scale with a simple course list, letter grades, and credit hours.
Open toolCalculators
Fuel Cost Calculator
Estimate trip fuel costs from distance and efficiency in L/100 km, mpg, or km/L, with fuel needed and total cost.
Open toolCalculators
Time Duration Calculator
Calculate the duration between two clock times or the sum of several durations, in hours, minutes, and seconds.
Open toolCalculators
Loan Payment Calculator
Calculate the monthly payment, total cost, and interest for any loan amount, rate, and term.
Open toolCalculators
Mortgage Payment Calculator
Estimate monthly mortgage payments from home price and down payment, with total interest and total cost.
Open toolCalculators
Grade Calculator (Final Exam Needed)
Find the score you need on your final exam to reach a target grade, from your current grade and the final weight.
Open toolCalculators
Percentage Increase Calculator
Calculate how much a value increased in percentage terms, from the original value to the new value.
Open toolCalculators
Percentage Change Calculator
Calculate the percentage change between any two values, showing increases and decreases with the difference.
Open toolGuides and solutions
Guides and solutions
Go deeper with practical guides and step-by-step workflows built around these tools.
How to calculate BMI correctly and what the number means
A practical guide to BMI with the [BMI calculator](tool:bmi-calculator): correct measurement, the formula in metric and imperial units, the standard ranges, and when BMI misleads.
Learn moreHow to calculate mortgage payments before talking to a lender
A practical guide to estimating mortgage payments with the [mortgage calculator](tool:mortgage-calculator): the inputs you need, how principal and interest are computed, and how to compare rate offers.
Learn moreHow to calculate a tip and split a bill fairly
A practical guide to tipping and splitting with the [tip calculator](tool:tip-calculator): tipping norms by region, quick mental math, rounding strategies, and fair splits for uneven orders.
Learn moreWhat local browser processing means for online tools
A transparent explanation of local tool processing, temporary browser memory, local storage, downloads, analytics boundaries, and cases that require remote services.
Learn moreCalculate your GPA from grades and credits
Applications, scholarships, and degree audits all come down to one number. The [GPA calculator](tool:gpa-calculator) works out your semester or cumulative GPA from grades and credits locally, and the [final grade calculator](tool:grade-calculator) plans the score you need next.
Open solutionCalculate your BMI online with correct measurements
The [BMI calculator](tool:bmi-calculator) gives you an instant result in metric or imperial units, with the category and honest guidance about what the number can and cannot tell you.
Open solutionEstimate your mortgage payment before the lender meeting
The [mortgage calculator](tool:mortgage-calculator) turns price, down payment, rate, and term into a monthly payment instantly, entirely in your browser.
Open solutionSplit a bill fairly and settle the tip in seconds
Dinner math should not be a group project. The [tip calculator](tool:tip-calculator) computes the tip, the total, and every persons share instantly, right in your browser.
Open solutionFind out what score you need on your final exam
The last weeks of a course are easier to plan when you know the exact number. With your current grade, the weight of the final exam, and your target, the [final grade calculator](tool:grade-calculator) works out the score you need before the exam.
Open solutionCategory questions
Category questions
No. Every calculator is free and needs no sign-up.
No. Calculations run in your browser and nothing is stored or transmitted.
Loan and currency results are educational estimates, not offers or financial advice.
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