Is SmartCalc free to use?

Yes, SmartCalc is 100% free with no subscriptions, no account required, and no hidden charges. All 40+ calculator tools are available to everyone forever.

Does SmartCalc use live currency rates?

Yes. The currency converter fetches live rates from the European Central Bank via the Frankfurter API with a fallback to the fawazahmed0 CDN. Rates update automatically each session.

Does SmartCalc store my data?

No. All calculations run in your browser. No data is ever sent to our servers. Only your theme preference is saved locally on your device.

Does the crypto converter show live prices?

Yes. Crypto prices are fetched live from the CoinGecko public API covering 40+ cryptocurrencies with 24-hour price change data.

40+ Free Calculator Tools · No Signup Required

Calculate Anything,
Instantly & Free

The most complete free calculator platform — standard & scientific math, live currency & crypto rates, BMI, loan EMI, GPA, investment returns, unit conversion and 30+ more tools. All run in your browser. Zero data collected.

⚡ Open Calculators Explore 40+ Tools

40+Calculator Types

200+Unit Conversions

LiveCurrency & Crypto

Zero Data Stored

Live Exchange Rates

Live Crypto Prices

Mobile Optimised

Keyboard Shortcuts

Always Free

◆ Standard Calculator

◆ Scientific Calculator

◆ Live Currency Converter

◆ Crypto Converter

◆ Unit Converter 200+

◆ BMI Calculator

◆ Loan / EMI

◆ Investment / CAGR

◆ GPA Calculator

◆ Calorie TDEE

◆ Percentage Tools

◆ Age Calculator

◆ Date Difference

◆ Statistics Calculator

◆ Matrix Calculator

◆ Quadratic Solver

◆ Ohm's Law

◆ Color Converter

◆ Password Generator

◆ Mortgage Calculator

◆ Standard Calculator

◆ Scientific Calculator

◆ Live Currency Converter

◆ Crypto Converter

◆ Unit Converter 200+

◆ BMI Calculator

◆ Loan / EMI

◆ Investment / CAGR

◆ GPA Calculator

◆ Calorie TDEE

The Tools

40 Calculators. One Place.

Choose any tool from the sidebar. All calculations run instantly in your browser — no data is ever sent anywhere.

Math

Conversion

Finance

Health

Date & Time

Academic

Engineering

Utility

Standard Calculator

Full arithmetic with history & keyboard shortcuts

History

Calculations appear here…

Live Exchange Rates

Click Convert for live rates

Amount

From Currency

To Currency

Enter amount and click convert

Data source: European Central Bank via Frankfurter API (primary) · fawazahmed0 CDN (fallback). Rates refresh each session. Note: For actual transactions always verify with your bank.

Live Crypto Prices via CoinGecko

Click Convert for live price

Cryptocurrency

Fiat Currency

Direction

Amount

Enter amount and click convert

Data source: CoinGecko Public API — no key required. Prices update each conversion. CoinGecko free tier may be rate-limited; wait a moment and try again if unavailable.

Unit System

Height (cm / in)

Weight (kg / lb)

BMI ranges: <18.5 Underweight · 18.5–24.9 Normal · 25–29.9 Overweight · ≥30 Obese. BMI is a screening tool, not a medical diagnosis.

Loan Amount (₹)

Annual Rate (%)

Term (Years)

Principal (₹)

Annual Rate (%)

Compounding

Years

Monthly SIP (₹, optional)

Property Price (₹)

Down Payment (₹)

Annual Rate (%)

Loan Term (Years)

Calculate Discount

Original Price (₹)

Discount %

Reverse Discount (find original price)

Sale Price (₹)

Discount Was (%)

Amount (₹)

Tax Rate (%)

Type

Exclusive: tax added on top. Inclusive: tax already inside the price — we extract it.

Total Bill (₹)

Tip %

Number of People

Annual CTC (₹)

Estimates based on standard Indian CTC structure: Basic 40%, HRA 20%, PF 12%. Tax uses simplified slabs. Consult a CA for exact figures.

Current Age

Retirement Age

Monthly Investment (₹)

Expected Return (%/yr)

Unit System

Age (years)

Sex

Height (cm / in)

Weight (kg / lb)

Activity Level

Uses Mifflin–St Jeor equation. Results are estimates — consult a nutritionist for personalised advice.

Body Weight (kg)

Activity Level

Based on 35ml per kg of body weight adjusted for activity. Hot climates may require 20–40% more.

First Day of Last Menstrual Period (LMP)

Uses Naegele's rule: LMP + 280 days (40 weeks). Actual due date may vary. Always consult your doctor for accurate dating.

Date of Birth

Enter your date of birth

Days Between Two Dates

From

Add / Subtract Days

Start Date

Days

Solve For

Value 1

Value 2

Select what to solve for, enter the other two values. Use km for distance, km/h for speed, hours for time.

Trip Distance (km)

Fuel Efficiency (km/L)

Fuel Price (₹/L)

Course	Grade	Credits

4.0 scale: A/A+ = 4.0 · A- = 3.7 · B+ = 3.3 · B = 3.0 · B- = 2.7 · C+ = 2.3 · C = 2.0 · D = 1.0 · F = 0

Item	Score (%)	Weight (%)

What is X% of Y?

X is what % of Y?

Percentage Change

From

Solve ax² + bx + c = 0

Numbers (comma or space separated)

Operation

Matrix A

Matrix B

Result appears here…

Simplify a Ratio (A : B)

Find Missing Value (A:B = C:D → find D)

Number → Roman Numeral

Enter Number (1–3999)

Roman Numeral → Number

Enter Roman Numeral

Input Value

From Base

Enter a value above

—

HEX Color

R (0–255)

G (0–255)

B (0–255)

hsl(--,--,--)

HSL equivalent

Quick Swatches

Time

From Time Zone

To Time Zone

Solve For

Voltage (V)

Current (A)

Resistance (Ω)

Shape

Dimension 1

Dimension 2 (if needed)

Enter all three sides to get angles and area

Side a

Side b

Side c

Operation

Binary A

Binary B (not needed for NOT)

Mode

Min

Max

Count (max 100)

Length: 16 characters

Uppercase A–Z Lowercase a–z Numbers 0–9 Symbols !@#$…

Enter Text

Calculate (N1 / D1) op (N2 / D2)

Numerator 1

Denominator 1

Numerator 2

Denominator 2

Why SmartCalc

Built for Real-World Use

Purpose-built tools with live data feeds, professional-grade formulas, and a design that gets out of your way.

⚡

Live Currency & Crypto Rates

The currency converter fetches real-time rates from the European Central Bank via Frankfurter API (no key required) with automatic fallback to the fawazahmed0 CDN. Crypto prices are live from CoinGecko covering 40+ coins with 24-hour change data. No stale numbers, ever.

🔬

Full Scientific Mode

30+ functions: all trig (degrees), inverse trig, hyperbolic, log₁₀, ln, log₂, roots, powers, factorial, floor, ceiling, absolute value, constants π, e, τ.

🌙

Premium Dark & Light Modes

Designed with equal care in both modes. Uses Plus Jakarta Sans + Fraunces serif for editorial elegance. Preference persists across visits.

⌨️

Full Keyboard Support

Complete keyboard control on the standard and scientific calculators. Numbers, operators, Enter, Backspace and Escape all mapped natively.

📱

Responsive & Touch-Ready

Mobile-first layout with touch-optimised button sizes. Works beautifully from 320px phones to 4K monitors without any app install.

🔒

Zero Data Collection

Every calculation runs in your browser. No inputs, results or history are ever sent to any server. The password generator uses the Web Crypto API.

🎓

Academic Suite

GPA calculator (4.0 scale with credit hours), grade calculator with weighted assignments, quadratic solver, statistics, matrix operations, triangle solver.

🏦

Complete Finance Toolkit

EMI, investment/CAGR with SIP, mortgage, salary/CTC breakdown, retirement corpus planner, discount, GST/VAT, tip splitter — all in one tab.

💻

Developer & Engineering Tools

Number base converter (DEC/BIN/OCT/HEX/B36), binary arithmetic (AND/OR/XOR/NOT), Ohm's Law, color converter (HEX↔RGB↔HSL), matrix calculator.

How It Works

Three Steps to Any Answer

Choose a Tool

Pick from 40 calculators in the left sidebar, organised by category. Use the search box to find any tool instantly.

Enter Values

Type via buttons, keyboard (standard/scientific), or fill in the form fields. Currency and crypto tools auto-fetch live rates.

Get Results

Results appear instantly in your browser. The standard calculator keeps a scrollable history. No page reloads.

Switch Freely

Jump between all 40 tools at any time via the sidebar — no lost state, no waiting, no account required.

FAQ

Frequently Asked Questions

Everything about SmartCalc answered. Can't find your question?

Ask Us →

Yes — 100% free forever. No subscriptions, no account required, no paywalled features. All 40 calculator tools are available to everyone at no cost. The service is sustained through standard display advertising.

Yes. The currency converter fetches real-time rates from the European Central Bank via the Frankfurter open API (no API key required). If that's unavailable, it automatically falls back to the fawazahmed0 CDN. A status badge in the tool shows whether you're seeing live or reference rates. Rates update each session — for actual financial transactions, always verify with your bank.

Crypto prices are fetched live from the CoinGecko public API — no API key needed. It covers 40+ cryptocurrencies and shows the current USD price, 24-hour change percentage, and market cap alongside the conversion. CoinGecko's free tier has rate limits; if you see a "rate limited" message, simply wait a moment and try again.

Never. Every calculation runs entirely in JavaScript inside your browser tab. No data is sent to any server at any time. The calculation history only lives in browser memory and disappears when you close the tab. Only your theme preference (light/dark) is saved — locally on your own device via localStorage.

Yes, SmartCalc is built mobile-first. All buttons, inputs, and layouts are optimised for touchscreens with appropriate touch target sizes. It works on iOS Safari, Android Chrome, and all modern mobile browsers — no app download needed.

On the Standard or Scientific tabs, keyboard control is fully supported: number keys (0–9), decimal point (.), operators (+ - * /), Enter or = for equals, Backspace to delete last digit, and Escape to clear all. Keyboard input only activates when those panels are selected.

The Calorie/TDEE calculator uses the Mifflin–St Jeor equation, the gold-standard formula recommended by the Academy of Nutrition and Dietetics: BMR = 10×weight + 6.25×height − 5×age + 5 (men) or −161 (women). BMR is then multiplied by your activity factor to give TDEE. Results are estimates — always consult a registered nutritionist for personalised advice.

Yes. It uses window.crypto.getRandomValues() — the browser's Web Crypto API — which produces cryptographically strong random numbers. This is the same standard used by security software. The password is generated entirely on your device and is never transmitted anywhere.

SmartCalc uses the standard amortisation formula: EMI = P × r × (1+r)ⁿ / ((1+r)ⁿ − 1). Results are accurate for standard fixed-rate loans with monthly compounding. Actual figures from your lender may vary due to processing fees, specific compounding frequency, insurance products, or other terms. Always verify with your financial institution.

Absolutely! Visit the Contact page and select "Feature Request" — we read every message and actively add new tools based on user feedback. We aim to respond within 24 business hours.

Calculate Anything,
Instantly & Free

40 Calculators. One Place.

Standard Calculator

Live Exchange Rates

Live Crypto Prices via CoinGecko

Calculate Discount

Reverse Discount (find original price)

Days Between Two Dates

Add / Subtract Days

What is X% of Y?

X is what % of Y?

Percentage Change

Simplify a Ratio (A : B)

Find Missing Value (A:B = C:D → find D)

Number → Roman Numeral

Roman Numeral → Number

UPPERCASE

lowercase

Reversed

Built for Real-World Use

Live Currency & Crypto Rates

Full Scientific Mode

Premium Dark & Light Modes

Full Keyboard Support

Responsive & Touch-Ready

Zero Data Collection

Academic Suite

Complete Finance Toolkit

Developer & Engineering Tools

Three Steps to Any Answer

Choose a Tool

Enter Values

Get Results

Switch Freely

Frequently Asked Questions

40 Calculators. Free Forever.

Calculate Anything, Instantly & Free

40 Calculators. One Place.

Standard Calculator

Live Exchange Rates

Live Crypto Prices via CoinGecko

Calculate Discount

Reverse Discount (find original price)

Days Between Two Dates

Add / Subtract Days

What is X% of Y?

X is what % of Y?

Percentage Change

Simplify a Ratio (A : B)

Find Missing Value (A:B = C:D → find D)

Number → Roman Numeral

Roman Numeral → Number

UPPERCASE

lowercase

Reversed

Built for Real-World Use

Live Currency & Crypto Rates

Full Scientific Mode

Premium Dark & Light Modes

Full Keyboard Support

Responsive & Touch-Ready

Zero Data Collection

Academic Suite

Complete Finance Toolkit

Developer & Engineering Tools

Three Steps to Any Answer

Choose a Tool

Enter Values

Get Results

Switch Freely

Frequently Asked Questions

40 Calculators. Free Forever.

Calculate Anything,
Instantly & Free