all converters & calculators

100+ free instant tools • glass interface • currency, units, health & finance

most valued converters

#1

currency pro

Different countries currencies (USD, EUR, GBP, INR, JPY) Conversion

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⚡ ultra

unit master

Length, mass, volume, area, speed, time – one tool with 50+ units.

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health

bmi & ideal weight

Body mass index, body fat, and healthy weight range (WHO standard).

check bmi

measurement & units

length

meters ↔ feet, miles ↔ km, inches ↔ cm – for travel & diy.

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weight / mass

kg ↔ lb, g ↔ oz, stone ↔ kg. perfect for fitness & shipping.

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temperature

°C ↔ °F ↔ K, plus °Ré, °Rø for scientists & cooks.

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volume

liters ↔ gal, ml ↔ fl oz, m³ ↔ ft³ – liquids & dry.

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area

sq meter ↔ sq ft, acre ↔ hectare, for real estate.

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speed

km/h ↔ mph, m/s ↔ knots, mach number.

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time

seconds ↔ min ↔ hours ↔ days, also weeks & years.

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Age calculator

days between dates, age calculator, next birthday.

calculate

financial & math tools

crypto + forex

BTC, ETH, USDT ↔ 50 fiat currencies. real-time updates.

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binary / hex / decimal

convert between bin, oct, dec, hex. for programmers.

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fraction ↔ decimal

simplify, mixed numbers, percent, and fraction arithmetic.

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loan / EMI

monthly EMI, total interest, amortization schedule.

calculate

DATE-TIME Calcultaor

Time, Date in Hours, Months, Days etc

calculate

percentage

increase, decrease, tip, discount, grade calculator.

calculate

numbers → words

cheque amount, text in english / hindi / spanish.

convert

roman numerals

MCMXC ↔ 1990, clock faces & chapter numbers.

convert

free kids converters & calculators

Nikhil Learn Hub brings measurement, number, finance, and health tools into one place. Pick a card above or open a grouped page from the left menu—each page explains how to convert with step-by-step examples.

how to use this hub

  1. Choose a tool from the grid (currency, length, BMI, binary, and more).
  2. Open the grouped page if several tools live together—for example measurement converters for length, weight, and temperature.
  3. Enter your value, pick units or options, then tap Convert or Calculate.
  4. Read the result and scroll down on that page for examples, tips, and links to related tools.

quick examples

Length: 5 km → miles ≈ 3.11 mi (try it)

Temperature: 25°C → Fahrenheit = 77°F

Currency: 100 USD → INR (live rate on finance converters)

Number: 255 decimal → binary = 11111111 (number tools)

explore by category

Use these pages for deeper guides, FAQs, and worked examples:

Measurement · Numbers & math · Finance · Date & health · Kids hub

accurate & kid-friendly

  • Standard conversion factors for length, weight, volume, and time
  • Currency and crypto with refreshable rates
  • EMI, age, and BMI with clear formulas on each page

works on phone & tablet

  • Responsive layout and touch-friendly buttons
  • Left menu jumps to the tool you need
  • No sign-up—open, convert, learn
Teacher tip: bookmark this hub for class demos. Students can practice travel distances, recipe cups, and currency in one session.