Free Online Calculators 🧮
42 calculators across Mathematics, Finance, Health, Science and more — every tool is one click away.
42Calculators
6Categories
70+Units
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🔢Mathematics9
🔢Basic Calculator
%Percentage
√Power & Root
÷GCD & LCM
𝑝Prime Checker
!Factorial
㏒Logarithm
∠Trigonometry
𝑥²Quadratic Solver
💰Finance10
💰Simple Interest
📈Compound Interest
🏦EMI Calculator
🏠Loan Calculator
📊ROI Calculator
💹SIP Calculator
🧾GST Calculator
🍽️Tip Calculator
🏷️Discount
💱Currency
❤️Health7
⚖️BMI Calculator
🔥Calorie Needs
💪Body Fat %
🏃Ideal Weight
💧Water Intake
❤️Heart Rate Zones
🤱Due Date
🔄Unit Conversion1
🔄Unit Converter
📅Date & Time6
🎂Age Calculator
📅Date Difference
➕Add / Subtract Days
📆Day of Week
💼Working Days
⏱️Unix Timestamp
⚡Science9
⚡Ohm's Law
🚀Kinematics
🧪Density
🔩Pressure
⚙️Work & Energy
〰️Wave Calculator
🔌Resistors
⚗️pH Calculator
🔊Speed of Sound
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Basic Calculator
Perform arithmetic on any two numbers.
Percentage Calculator
Three types of percentage calculations.
Power & Square Root
Exponentiation and nth roots.
GCD & LCM
Greatest Common Divisor and Least Common Multiple.
Prime Number Checker
Check if any number is prime.
Factorial Calculator
Computes n! for any n from 0 to 20.
Logarithm Calculator
Natural log, log₁₀, and any custom base.
Trigonometry Calculator
sin, cos, tan for degrees or radians.
Quadratic Equation Solver
Solves ax² + bx + c = 0
Simple Interest
I = P × R × T ÷ 100
Compound Interest
A = P(1 + r/n)^(nt)
EMI Calculator
Monthly loan instalment amount.
Loan / Mortgage Calculator
Monthly payment, total cost and interest.
ROI Calculator
Return on Investment percentage.
SIP Calculator
Systematic Investment Plan — future value.
GST Calculator
Add or extract GST from any amount.
Tip Calculator
Calculate tip and split the bill.
Discount Calculator
Final price and savings after discount.
Currency Converter
Enter the exchange rate manually to convert any amount.
BMI Calculator
Body Mass Index — metric or imperial.
Calorie Needs (TDEE)
Daily calorie requirements using Mifflin-St Jeor formula.
Body Fat % Calculator
US Navy tape-measure method.
Ideal Weight Calculator
Based on the Devine formula.
Daily Water Intake
Recommended hydration based on weight and activity.
Heart Rate Zones
Training zones using the Karvonen formula.
Pregnancy Due Date
Calculate due date from Last Menstrual Period (LMP).
Unit Converter
Convert between 10 categories and 70+ units instantly.
Age Calculator
Your exact age in years, months, days and more.
Date Difference
Days, weeks, months and hours between two dates.
Add / Subtract Days
Find the date N days before or after a given date.
Day of the Week
Find which day of the week any date falls on.
Working Days Calculator
Business days between two dates (Monday–Friday).
Unix Timestamp Converter
Convert between Unix timestamps and readable dates.
Ohm's Law
V = I × R — fill any two fields, solve for the third.
Kinematics Calculator
Fill any 3 variables (u, v, a, t) to solve for the rest.
Density Calculator
ρ = m/V — fill any two to find the third.
Pressure Calculator
P = F/A — fill any two to find the third.
Work & Energy
W = F × d × cos(θ)
Wave Calculator
v = f × λ — defaults to speed of light (299,792,458 m/s).
Resistor Calculator
Total resistance for series or parallel combinations.
pH Calculator
Calculate pH from ion concentration (mol/L).
Speed of Sound
Speed of sound in air at a given temperature.