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Finance, health, time, and utility tools - fast, accurate, and completely free.
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Core Calculators
Age Calculator
Exact age in years, months, days
EMI Calculator
Loan EMI with amortization
Simple Interest
SI = P x R x T / 100
Compound Interest
CI with year-wise growth
Percentage Calculator
3-in-1 percentage operations
Discount Calculator
Final price after discount
Profit Margin Calculator
Gross margin and markup percent
Break-Even Calculator
Units to cover all costs
Markup Calculator
Price from cost plus markup
Tip Calculator
Tip and total per person
Split Bill Calculator
Divide bill with tax and tip
Finance Tools
FD Calculator
Fixed Deposit maturity and interest
GST Calculator
Add or remove GST (India)
Income Tax Calculator (FY 2024-25)
New vs old regime comparison
HRA Exemption Calculator
HRA exempt and taxable (India)
Salary In-Hand Calculator
Take-home after tax (India)
SIP Calculator
Mutual fund SIP returns
EPF Calculator
Provident fund corpus estimate
NPS Calculator
NPS corpus and pension estimate
Loan Eligibility Calculator
Max loan from income
Gratuity Calculator
Payment of Gratuity Act
RD Calculator
Recurring Deposit maturity
PPF Calculator
PPF corpus estimate
Inflation Calculator
Purchasing power over time
Loan Interest Calculator
Total interest on any loan
Credit Card EMI Calculator
True cost of credit card EMI
Savings Goal Calculator
Monthly savings to reach a goal
CAGR Calculator
Compound annual growth rate
ROI Calculator
Return on investment percent
Stamp Duty Calculator
Stamp and registration charges
Gold Loan Calculator
Max loan and payments estimate
Retirement Calculator
Corpus needed and monthly savings
Rent vs Buy Calculator
Home decision model
Dividend Calculator
Dividend income and yield
Math Tools
Scientific Calculator
Functions, powers, trig, logs
Fraction Calculator
Add/subtract/multiply/divide fractions
LCM and GCD Calculator
LCM and HCF of numbers
Statistics Calculator
Mean, median, mode, standard deviation
Quadratic Equation Solver
Solve ax^2 + bx + c
Area and Volume Calculator
Common shapes
Number Base Converter
Binary/hex/octal/decimal
Ratio Calculator
Simplify and scale ratios
Average Calculator
Mean of numbers
Square Root / Power
x^y, sqrt(x), nth root
Education Tools
Everyday Tools
Developer Tools
Time and Date Tools
Date Difference Calculator
Days between two dates
Add / Subtract Days
Find future/past date
Age in Days / Minutes
Your age in every unit
Work Hours Calculator
Total hours worked, multi-day
Time Duration Calculator
Hours and minutes between times
Countdown to Date
Live countdown to event
Business Days Calculator
Working days (Mon-Fri)
Week Number Calculator
ISO week number for any date
Timezone Converter
Convert between world timezones
Days Until Calculator
Days until any date/event
Meeting Time Planner
Find overlaps across timezones
Time Since Calculator
How long ago was a date/time
Stopwatch / Timer
Online stopwatch and countdown
Health Tools
BMI Calculator
Body Mass Index with category
Calorie Calculator (TDEE)
Daily calorie needs
Ideal Weight Calculator
Ideal weight by 4 formulas
Body Fat Percent
US Navy method
Lean Body Mass
LBM by 3 formulas
BMR Calculator
Calories burned at rest
Water Intake Calculator
Daily hydration goal
Macro Calculator
Protein, carbs and fat goals
Pregnancy Due Date
Due date and trimester timeline
Ovulation Calculator
Fertile window and ovulation day
Calories Burned Calculator
Exercise calories (MET)
Sleep Calculator
Bedtime/wake time cycles
Protein Intake Calculator
Protein target by goal
Blood Pressure by Age
Normal ranges by age group
Text and Utility Tools
Word and Character Counter
Live word and character count
Password Generator
Secure random passwords
QR Code Generator
Free QR codes, no watermark
Case Converter
UPPER, lower, camelCase and more
Remove Duplicate Lines
Dedupe any list instantly
Text Sorter
Sort lines A-Z, by length
Slug Generator
SEO-friendly URL slugs
Random Text Generator
Lorem Ipsum and placeholder
Number to Words
Convert numbers into words (India)
Morse Code Translator
Text to/from Morse code
Roman Numeral Converter
Roman <-> decimal numbers
Fun and Viral Tools
About ToolHaven
ToolHaven is a free collection of 100+ online calculators covering financial planning (EMI, SIP, PPF, GST, salary), health and fitness (BMI, TDEE, macros, body fat), time and date tools (countdown, timezone, business days), and utility tools (password generator, QR code, slug generator). All tools work instantly in your browser - no account needed.