Live library
Browse every live calculator.
33 tools are ready for finance, health, tax, dates, and everyday math. Open one, enter your figures, and read the formula beside the estimate.
Formula shown
Runs in your browser
Educational estimates
Mapped to search intent
How it works
Three steps from question to estimate.
The same path works on a phone or a desktop. Nothing is uploaded when you calculate.
Choose a tool or a keyword
Start from a calculator, a category, or a search phrase already mapped in the inventory.
Enter the values you know
Labels stay visible. Change one input and calculate again to compare scenarios.
Read the result beside the formula
The estimate, the formula, and a worked example stay on the same page.
Topics
Calculator categories
These groups are live today. Each card opens the calculators in that topic.
Date & Time
3 live calculators
Open categoryMathematics
7 live calculators
Open categoryHealth & Fitness
5 live calculators
Open categoryFinance
3 live calculators
Open categoryInvestment
3 live calculators
Open categoryTax
1 live calculator
Open categoryUnit Conversion
1 live calculator
Open categorySalary
2 live calculators
Open categoryBusiness
4 live calculators
Open categoryLoans
1 live calculator
Open categoryReference
2 live calculators
Open categoryEducational
1 live calculator
Open categoryTools
Full calculator library
Open a calculator, edit the inputs, and keep the formula in view.
Age Calculator
Calculate age in years, months, and days between two dates.
Open calculatorPercentage Calculator
Find a percentage of a value or calculate percentage change.
Open calculatorBMI Calculator
Estimate body mass index using height and weight.
Open calculatorEMI Calculator
Compute Equated Monthly Installment for a loan.
Open calculatorSIP Calculator
Project future value of a monthly SIP investment.
Open calculatorGST Calculator
Calculate GST amount and total value including tax.
Open calculatorWater Intake Calculator
Estimate daily hydration needs based on body weight.
Open calculatorUnit Converter
Convert between common units of length, weight, and temperature.
Open calculatorDate Difference Calculator
Find the difference between two dates in days, months, and years.
Open calculatorSalary Calculator
Estimate monthly take-home pay after taxes and deductions.
Open calculatorCompound Interest Calculator
Estimate growth from an initial principal over time with compounding.
Open calculatorSimple Interest Calculator
Calculate interest and total maturity value using the simple-interest formula.
Open calculatorDiscount Calculator
Find the discount amount and final price after a percentage reduction.
Open calculatorHome Loan Calculator
Estimate monthly home-loan EMI, interest, and total repayment.
Open calculatorPregnancy Weeks Calculator
Estimate approximate pregnancy week based on the last menstrual period.
Open calculatorTip Calculator
Add a percentage tip to a bill and show the total.
Open calculatorTime Calculator
Add two durations given in hours and minutes.
Open calculatorRatio Calculator
Find the missing amount in a ratio A:B when A is known.
Open calculatorArea Calculator
Find the area of a rectangle from length and width.
Open calculatorVolume Calculator
Find the volume of a box from length, width, and height.
Open calculatorAverage Calculator
Average up to four numbers you type. It does not fetch live prices.
Open calculatorCAGR Calculator
Estimate compound annual growth from a start value, an end value, and years.
Open calculatorFraction Calculator
Simplify a fraction to its lowest terms.
Open calculatorLCM Calculator
Find the least common multiple of two whole numbers.
Open calculatorNumerology Name Calculator
Turn letters in a name into a single digit puzzle. It is not a prediction.
Open calculatorAttendance Calculator
Turn classes attended and classes held into an attendance percentage.
Open calculatorMileage Calculator
Estimate kilometres per litre from distance and fuel used.
Open calculatorSalary Hike Calculator
Find the percent change between a current amount and a new amount.
Open calculatorProfit Calculator
Find profit and margin from cost and selling price. Fees you do not type are not included.
Open calculatorSWP Calculator
Estimate the corpus for a fixed monthly withdrawal at a rate you choose.
Open calculatorBrokerage Percent Calculator
Apply a percent you type to a trade value. It is not a broker fee card.
Open calculatorPeriod Calculator
Add a cycle length in days to a start date. This is not a diagnosis or a fertility plan.
Open calculatorCalorie Calculator
Estimate basal metabolic rate with the Mifflin-St Jeor formula. It is not a diet plan.
Open calculatorBefore you rely on a figure
Useful for learning. Careful by design.
What this helps you do
- See the formula before you trust the number.
- Compare scenarios by editing the inputs.
- Move to a related calculator without starting over.
- Land on a keyword or question page that points at a tool.
Limits to keep in mind
- The output only reflects the inputs and the formula on the page.
- Fees, rounding, and local rules can change a real payment or dose.
- Health tools, including pregnancy weeks, are approximate.
- This is a learning aid, not a lender, clinician, or tax filing service.
Search inventory
Top categories
The largest clusters in the imported keyword file. These describe search coverage, separate from the live calculator groups above.
Reference
404 mapped pages
Loans; Reference
335 mapped pages
Portfolio; Reference
160 mapped pages
Pension; Reference
99 mapped pages
Savings accounts; Reference
98 mapped pages
Planning; Reference
93 mapped pages
Funds; Reference
78 mapped pages
Comparisons; Loans; Reference
66 mapped pages
OBGYN; Reference
64 mapped pages
Life insurance; Reference
48 mapped pages
Demand
High-opportunity keywords
Highest-volume phrases in the current dataset. Each one opens its keyword page.
age calculator
sip calculator
percentage calculator
home loan calculator
swp calculator
date calculator
loan calculator
gst calculator
days calculator
fd calculator
home loan emi calculator
tip calculator
pregnancy calculator
compound interest calculator
gratuity calculator
income tax calculator
personal loan emi calculator
date of birth calculator
loan emi calculator
time calculator
Guides
Formula notes you can cite
Short articles that match the calculator on the page. Each one states the formula, a worked figure, and the limit of the estimate.
Date & Time
Age in years and months, or a plain day count
Use the age calculator when you want completed years, leftover months and leftover days. Use the date-difference calculator when you want the span as a whole number of days. They are not two views of the same output. One borrows months and days. The other divides the date gap by 86,400,000 and floors the result at zero.
Read the guide
Mathematics
Percent, discount, and unit conversion are three different questions
A percentage on CalculatorX is part ÷ whole × 100. A discount is price × rate ÷ 100, subtracted from the price. A unit conversion applies one known factor, and only for kilometre/mile, metre/kilometre, kilogram/pound, and Celsius/Fahrenheit. Using the wrong page produces a confident number for a different question.
Read the guide
Health & Fitness
How to read the BMI number on this site
The BMI page divides weight in kilograms by height in metres squared. Height is entered in centimetres and divided by 100. Below 18.5 is labelled Underweight, 18.5 up to 25 is Normal, 25 up to 30 is Overweight, and 30 or above is Obese. Those words are screening bands, not a diagnosis.
Read the guide
Health & Fitness
Pregnancy weeks from the last menstrual period
The pregnancy-weeks page counts days from the first day of the last menstrual period to a reference date, then divides by 7 and shows one decimal place. It does not calculate a due date, a trimester, or a conception day. It is not medical advice.
Read the guideGuides
Question-driven content
Short answers that point to a calculator when you want to run the numbers.
how much water to drink a day calculator
This question is addressed with a practical explanation and calculator guidance. For how much water to drink a day calculator, use the relevant calculator to estimate the result with verified assumptions and examples.
Read answerhow many days after my period can i get pregnant calculator
This question is addressed with a practical explanation and calculator guidance. For how many days after my period can i get pregnant calculator, use the relevant calculator to estimate the result with verified assumptions and examples.
Read answeris calculator allowed in jee mains 2026
This question is addressed with a practical explanation and calculator guidance. For is calculator allowed in jee mains 2026, use the relevant calculator to estimate the result with verified assumptions and examples.
Read answerhow many weeks pregnant calculator
This question is addressed with a practical explanation and calculator guidance. For how many weeks pregnant calculator, use the relevant calculator to estimate the result with verified assumptions and examples.
Read answerhow to off calculator
This question is addressed with a practical explanation and calculator guidance. For how to off calculator, use the relevant calculator to estimate the result with verified assumptions and examples.
Read answeris calculator allowed in jee
This question is addressed with a practical explanation and calculator guidance. For is calculator allowed in jee, use the relevant calculator to estimate the result with verified assumptions and examples.
Read answeris calculator allowed in cat
This question is addressed with a practical explanation and calculator guidance. For is calculator allowed in cat, use the relevant calculator to estimate the result with verified assumptions and examples.
Read answerwhen will i get married astrology calculator
This question is addressed with a practical explanation and calculator guidance. For when will i get married astrology calculator, use the relevant calculator to estimate the result with verified assumptions and examples.
Read answerFAQ
Questions about CalculatorX
Are CalculatorX calculators free to use?
Yes. Every calculator runs in your browser. There is no account, and the result appears as soon as you enter values.
Are the results financial, tax, or medical advice?
No. They are educational estimates based on the formula shown on the page. Check a qualified professional before you rely on a figure for a loan, tax, health, or pregnancy decision.
Why does each calculator show a formula and an example?
So you can see how the number was produced and compare it with a known case. The formula, the example, and the result stay together on the same page.
What are the keyword and question pages for?
They connect search language to a relevant calculator. Keyword pages show volume, difficulty, and intent. Question pages answer a specific question and link to the tool.
Can I switch between light and dark theme?
Yes. Use the theme control in the header. Your choice is saved on this device. If you have not chosen, CalculatorX follows your system setting.
Start with a real input
Run a calculator, then check the formula.
Pick a live tool and keep the estimate next to the method. Use the dashboard when you want the inventory counts.