Maths
x% of y
= y% of x
= y% of x
How to calculate percentage (with examples)
Three quick methods, plus shortcuts you can do in your head.
Use with: Percentage calculator →
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Free calculators for health, maths, construction and e-commerce — with the formula and a worked example on every page.
Pick your zone
Four zones. Every calculator shows the formula and a worked example.
01 · HLT
Health
BMI, calories, due date and more
BMI, calories, body fat, ideal weight, pregnancy due date and more.
02 · MTH
Maths
Percentage, fractions, age and more
Percentage, fractions, age, average, ratio, LCM & HCF and more.
03 · BLD
Construction
Bricks, cement, tiles, cost in ₹
Bricks, cement, concrete, tiles, paint, steel and house cost in ₹.
04 · ECM
E-commerce
Amazon, Flipkart, Meesho profit
Amazon, Flipkart, Meesho and Shopify profit, fees and margin.
Popular calculators
View all calculatorsLatest guides
Read the method, then run your own numbers.
Construction
volume =
L × W × thickness
L × W × thickness
Concrete for slab, beam and column
Work out cement bags, sand and aggregate step by step.
Use with: Concrete calculator →
Health
BMI =
kg ÷ m²
kg ÷ m²
BMI for Indians: why the healthy range is lower
What the Asian cut-offs mean and how to read your result.
Use with: BMI calculator →
E-commerce
profit = price
− cost − fees
− cost − fees
Amazon seller fees, explained simply
How referral, shipping and closing fees change your real profit.
Use with: Amazon profit calculator →
Answers as you typeNo “Calculate” button, no reloads.
Your units, built inSq ft, gaj, bigha, kg and rupees.
We show the workingFormula and worked example every time.