Directory
All calculators
30 free calculators for money, maths, health and dates. Search by name or filter by category to find the one you need.
30 of 30 calculators
BMI Calculator
Know your Body Mass Index in seconds — with healthy-range context.
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Percentage Calculator
What is X% of Y? What % is X of Y? Answered with steps.
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Percentage Increase / Decrease Calculator
Old → new percent change, with increase vs decrease explained.
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Age Calculator
Exact age in years, months, days — plus totals and next birthday.
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Date Difference Calculator
Days between dates — with weekdays, weekends and inclusive counts.
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Time Calculator
Hours between times, shift lengths and add-duration maths.
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Discount Calculator
Sale price, savings and stacked discounts — with optional tax.
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Tip Calculator
Fair tips and clean bill splits — per-person totals included.
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Loan Calculator
Monthly payment, total interest and true cost of any loan.
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EMI Calculator
Equated Monthly Instalment for home, car and personal loans.
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Compound Interest Calculator
Growth on growth — future value with contributions shown yearly.
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Simple Interest Calculator
Linear interest on principal — loans, deposits and late fees.
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GST Calculator
Add or strip GST — net, tax, gross plus CGST/SGST split.
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Fraction Calculator
Add, subtract, multiply, divide and simplify fractions exactly.
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Average Calculator
Mean, median, range and count — paste any number list.
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SIP Calculator
See what a monthly mutual fund SIP could grow to — with optional yearly step-up.
Open calculatorFD Calculator
Fixed deposit maturity value and interest, with quarterly or monthly compounding.
Open calculatorRD Calculator
Recurring deposit maturity value for a fixed monthly saving, compounded quarterly.
Open calculatorMortgage Calculator
Monthly home payment with principal, interest, property tax, insurance and PMI.
Open calculatorCAGR Calculator
Compound annual growth rate between two values — investments, revenue or anything that grows.
Open calculatorProfit Margin Calculator
Margin, markup and profit from cost and price — or the price you need for a target margin.
Open calculatorCalorie Calculator
Daily calories to maintain, lose or gain weight — BMR and TDEE using Mifflin–St Jeor.
Open calculatorBody Fat Calculator
Estimate body fat percentage with a tape measure — the U.S. Navy circumference method.
Open calculatorIdeal Weight Calculator
Healthy weight range for your height, plus the Devine, Robinson, Miller and Hamwi formulas.
Open calculatorWaist-to-Height Ratio Calculator
Keep your waist to less than half your height — check your ratio against NICE bands.
Open calculatorStandard Deviation Calculator
Sample and population standard deviation, variance and mean for any list of numbers.
Open calculatorLCM & GCF Calculator
Least common multiple and greatest common factor of up to 20 numbers, with Euclid's steps.
Open calculatorRatio Calculator
Simplify ratios, solve proportions (a:b = c:x) and split a total in any ratio.
Open calculatorAdd or Subtract Days Calculator
Add or subtract days, weeks, months or years from a date — or count business days only.
Open calculatorWork Hours Calculator
Weekly timesheet: hours worked minus breaks, overtime and pay — overnight shifts included.
Open calculatorHow to choose the right calculator
Start with the question you want answered. Comparing loan offers? Use the EMI or Loan calculator and look at the total interest, not just the monthly payment. Checking a sale price? The Discount calculator handles stacked coupons and tax, and Percentage Change shows whether a “was/now” price adds up. For school admission cut-offs and notice periods, the Age and Date Difference calculators count exact days.
Every calculator works the same way: enter your numbers, press Calculate and read the result. If an input doesn't make sense, you'll see a message explaining why. Below each calculator is a guide with the formula, a worked example and the sources we used.