🔢 100+ Calculators

Free Online Calculators

Fast, accurate calculators for finance, health, math, and everyday decisions. No sign up required.

🖨️

3D Printing Cost Calculator

Calculate 3D printing costs with materials and time

Unique
Engineering
🎂

Age Calculator

Calculate exact age in years, months, days, and hours

Everyday Tools
🛏️

Airbnb Income Calculator

Calculate Airbnb rental income and compare to long-term rentals

Unique
Real Estate
🍺

Alcohol Unit Calculator

Calculate alcohol units in different drinks for safe drinking

Health & Fitness

Average Calculator

Calculate mean, median, mode, and range of numbers

Math & Science
👶

Baby Name Numerology Calculator

Calculate baby name numerology and meaning for any name

Lifestyle & Fun
🍷

BAC Calculator

Estimate blood alcohol content for educational purposes

Health & Fitness
📐

Beam Calculator

Calculate beam deflection, moment, and shear force

Pro
Engineering

Bitcoin Profit Calculator

Calculate Bitcoin investment profits, losses, and ROI instantly

Trending
Crypto & Investment
⚖️

BMI Calculator

Check your body mass index and find your healthy weight range

Popular
Health & Fitness
🔥

BMR Calculator

Calculate basal metabolic rate to know daily calorie needs

Health & Fitness
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Body Fat Calculator

Calculate body fat percentage using measurements

Health & Fitness
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BRRRR Calculator

Calculate BRRRR real estate investment returns and equity

Pro
Real Estate

Caffeine Calculator

Calculate daily caffeine intake from various sources

Health & Fitness
📊

CAGR Calculator

Calculate compound annual growth rate for any investment

Most Used
Crypto & Investment
🍎

Calorie Calculator

Calculate daily calorie intake for weight loss or gain

Health & Fitness
🚗

Car Loan Calculator

Calculate auto loan EMI with interest rate and down payment options

Financial Calculators
🌍

Carbon Footprint Calculator

Calculate personal carbon footprint and get reduction tips

Trending
Lifestyle & Fun
🐱

Cat Age Calculator

Convert cat years to human years with veterinary accuracy

Lifestyle & Fun
📋

Closing Cost Calculator

Estimate home buying closing costs and cash needed

Real Estate
🎓

College GPA Calculator

Calculate college GPA with credit hour weighting

Popular
Education
📊

Compound Interest Calculator

Calculate compound interest with various compounding frequencies

Financial Calculators
🏗️

Concrete Calculator

Calculate concrete volume needed for construction projects

Popular
Engineering
💎

Crypto Tax Calculator

Calculate crypto capital gains tax with multiple accounting methods

Popular
Crypto & Investment
📅

Date Calculator

Calculate days between dates and add or subtract days

Everyday Tools
🌾

DeFi Yield Calculator

Calculate DeFi yield farming returns and impermanent loss

AI Powered
Crypto & Investment
🏷️

Discount Calculator

Calculate discount percentage and final price after discount

Business & Tax
💰

Dividend Calculator

Calculate dividend income, yield, and reinvestment growth

Crypto & Investment
🐕

Dog Age Calculator

Convert dog years to human years with breed-specific accuracy

Unique
Lifestyle & Fun
📅

Dollar Cost Average Calculator

Calculate dollar cost averaging returns and compare to lump sum

Popular
Crypto & Investment
💵

Down Payment Calculator

Calculate down payment amounts and PMI requirements

Real Estate
🔢

EMI Calculator

Calculate monthly loan payments with interest breakdown and amortization schedule

Financial Calculators
💰

EPF Calculator

Calculate Employee Provident Fund maturity amount

Business & Tax

Ethereum Gas Fee Calculator

Estimate Ethereum gas fees and transaction costs in real-time

Crypto & Investment
🏦

FD Calculator

Calculate fixed deposit maturity amount and interest earned

Financial Calculators
📚

Final Grade Calculator

Calculate required final exam grade for target course grade

Education
🔥

FIRE Calculator

Calculate your FIRE number and early retirement timeline

Trending
Crypto & Investment
🔢

Fraction Calculator

Add, subtract, multiply, and divide fractions

Math & Science
⚙️

Gear Ratio Calculator

Calculate gear ratios, speed, and torque for gear systems

Engineering
📚

Grade Calculator

Calculate GPA and final grades for students

Everyday Tools
🎁

Gratuity Calculator

Calculate gratuity amount based on years of service

Business & Tax
🔢

GST Calculator

GST Calculator – Calculate GST, VAT & Sales Tax Online Free 💰 Tax Tool GST Calculator – Add or Remove GST, VAT & Sales Tax Online Calculate goods and services tax instantly. Add GST to a price or remove GST from a total. Works with any tax rate for all countries including VAT and sales […]

Business & Tax
🏠

Home Loan EMI Calculator

Calculate home loan monthly payments with detailed amortization schedule

Financial Calculators
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House Flipping Calculator

Calculate house flipping profits with all costs included

Real Estate
🏘️

HRA Calculator

Calculate house rent allowance tax exemption amount

Business & Tax
🔧

Hydraulic Cylinder Calculator

Calculate hydraulic cylinder force and pressure requirements

Engineering
🎯

Ideal Weight Calculator

Find your ideal body weight based on height and gender

Health & Fitness
📋

Income Tax Calculator

Calculate income tax liability for current financial year

Business & Tax
💪

Lean Body Mass Calculator

Calculate lean muscle mass and body composition

Health & Fitness
💡

LED Resistor Calculator

Calculate LED current-limiting resistor values

Engineering

Life Expectancy Calculator

Estimate life expectancy based on lifestyle and health factors

Unique
Lifestyle & Fun
🎰

Lottery Odds Calculator

Calculate lottery winning odds for any game configuration

Unique
Lifestyle & Fun
❤️

Love Calculator

Calculate love compatibility percentage between two names

Trending
Lifestyle & Fun
💎

Lumpsum Calculator

Calculate returns on one-time investment in mutual funds

Financial Calculators
🥗

Macro Calculator

Calculate macronutrient ratios for diet goals

Health & Fitness
💲

Markup Calculator

Calculate markup percentage and selling price from cost

Business & Tax
⛏️

Mining Profitability Calculator

Calculate crypto mining profits with electricity and hardware costs

Crypto & Investment
🏠

Mortgage Affordability Calculator

Calculate how much house you can afford based on income

Most Used
Real Estate
🔄

Mortgage Refinance Calculator

Calculate mortgage refinance savings and break-even point

Real Estate
💎

Net Worth Calculator

Calculate total net worth with assets and liabilities

Popular
Financial Calculators
🎨

NFT Profit Calculator

Calculate NFT profits with fees, royalties, and gas costs

Unique
Crypto & Investment
📈

NPS Calculator

Calculate National Pension Scheme maturity and monthly pension

Financial Calculators

Ohms Law Calculator

Calculate voltage, current, resistance with Ohms Law

Most Used
Engineering
📅

Ovulation Calculator

Calculate fertile window and ovulation days

Health & Fitness
🏃

Pace Calculator

Calculate running pace and time for different distances

Health & Fitness
%

Percentage Calculator

Find percentages, increases, decreases, and differences instantly

Trending
Math & Science
🔄

Percentage Change Calculator

Calculate percentage change with positive or negative values

Math & Science
📉

Percentage Decrease Calculator

Calculate percentage decrease between two values

Math & Science
📈

Percentage Increase Calculator

Calculate percentage increase between two numbers

Math & Science
💳

Personal Loan Calculator

Calculate personal loan EMI and total interest payable

Financial Calculators
🎯

PPF Calculator

Calculate Public Provident Fund maturity amount and returns

Financial Calculators
🤰

Pregnancy Calculator

Calculate due date and pregnancy week by week

Health & Fitness
📈

Profit Margin Calculator

Calculate gross and net profit margins for your business

Business & Tax
🏛️

Property Tax Calculator

Estimate property taxes based on home value and location

Real Estate
🥩

Protein Calculator

Calculate daily protein intake for muscle building

Health & Fitness
⚙️

Pulley Calculator

Calculate pulley mechanical advantage and belt lengths

Engineering
⚖️

Ratio Calculator

Calculate and simplify ratios and proportions

Math & Science
💵

RD Calculator

Calculate recurring deposit maturity value with monthly installments

Financial Calculators
📖

Reading Time Calculator

Calculate reading time based on word count and speed

Education
🏘️

Rent vs Buy Calculator

Compare renting vs buying a home with full cost analysis

Popular
Real Estate
🏢

Rental Property ROI Calculator

Calculate rental property ROI, cap rate, and cash flow

Real Estate
🔴

Resistor Color Code Calculator

Decode resistor color bands to resistance values

Engineering
🎯

ROI Calculator

Calculate return on investment percentage and profit

Business & Tax
🧮

Scientific Calculator

Advanced calculator with trigonometric and logarithmic functions

Math & Science
📱

Screen Time Calculator

Calculate screen time and digital wellness insights

Trending
Lifestyle & Fun
🔢

Simple Interest Calculator

📊 Basic Interest Tool Simple Interest Calculator – Easy Interest Calculator Calculate simple interest on loans, deposits, and investments instantly. Find interest amount, total value, and monthly returns with our free simple interest calculator. Perfect for personal loans, savings accounts, and short-term investments worldwide. How it Works FAQ Simple Interest Calculator Calculate interest on principal […]

Financial Calculators
📈

SIP Calculator

Estimate mutual fund returns with systematic investment planning

Financial Calculators
😴

Sleep Calculator

Calculate optimal sleep and wake times based on sleep cycles

Popular
Health & Fitness
🥩

Staking Rewards Calculator

Calculate crypto staking rewards and compound earnings

Crypto & Investment
📈

Stock Options Calculator

Calculate stock option values and break-even points

Crypto & Investment
🎓

Student Loan Calculator

Calculate student loan payments and compare repayment plans

Most Used
Financial Calculators
👧

Sukanya Samriddhi Calculator

Calculate SSY account maturity value for girl child

Financial Calculators
💸

SWP Calculator

Calculate systematic withdrawal plan from mutual fund investments

Financial Calculators

TDEE Calculator

Calculate total daily energy expenditure based on activity level

Health & Fitness
📊

TDS Calculator

Calculate tax deducted at source for salary and other income

Business & Tax

Time Calculator

Add, subtract, and calculate time duration

Everyday Tools
💵

Tip Calculator

Calculate tip amount and split bills among friends

Everyday Tools
⌨️

Typing Speed Calculator

Calculate typing speed in WPM with accuracy tracking

Education
💧

Water Intake Calculator

Calculate daily water intake based on weight and activity

Health & Fitness
🔌

Wire Gauge Calculator

Calculate correct wire gauge for safe electrical wiring

Engineering

Why Use Online Calculators?

Online calculators have become essential tools for millions of people worldwide. Whether you are planning your finances, tracking your health goals, or solving complex math problems, having access to accurate and reliable calculators makes life easier. At ToolsInstant, we offer a comprehensive collection of free calculators designed to help you make informed decisions quickly.

Our calculators cover a wide range of categories including financial planning, health and fitness tracking, mathematical computations, business analysis, and everyday practical needs. Each calculator is built with precision and tested for accuracy, ensuring you get dependable results every time you use them.

Financial Calculators for Smart Money Management

Managing your money effectively requires the right tools. Our EMI Calculator helps you understand your monthly loan payments before you commit to any borrowing. The SIP Calculator shows you how systematic investments can grow over time through the power of compounding. For those planning major purchases, our mortgage and car loan calculators provide detailed breakdowns of payments, interest, and total costs.

Investment planning becomes straightforward with tools like our compound interest calculator, which demonstrates how your savings can multiply over the years. Business owners benefit from profit margin calculators and ROI tools that help analyze deals and pricing strategies.

Health and Fitness Calculators

Your health journey deserves accurate tracking. Our BMI Calculator provides instant body mass index readings along with healthy weight ranges. The TDEE Calculator determines your total daily energy expenditure, which is crucial for weight management. Fitness enthusiasts use our protein calculator and macro calculator to optimize their nutrition for muscle building or fat loss.

We also offer specialized health tools including pregnancy calculators for expecting mothers, pace calculators for runners, and water intake calculators to help you stay properly hydrated throughout the day.

Math and Science Tools

Students and professionals alike benefit from our mathematical calculators. From basic percentage calculations to complex scientific functions, our tools handle computations with precision. The percentage calculator solves increase, decrease, and difference problems instantly. Our ratio and fraction calculators simplify mathematical concepts that often cause confusion.

Always Free, Always Accurate

Every calculator on ToolsInstant is completely free to use with no registration required. We believe everyone deserves access to quality tools without barriers. Our calculators work on any device including phones, tablets, and computers. Results appear instantly, and you can use our tools as many times as you need.

Browse our complete collection above and bookmark your favorites for quick access. If you cannot find a specific calculator you need, feel free to request it and our team will work on adding it to our library.

Need a specific calculator?

We add new calculators every week based on user requests.