PDFAITools
Every Calculator You Need — In One Place
From mortgages and 401(k) to TDEE, quadratic equations and voltage drop — 200+ free calculators covering finance, health, math, science, construction and more. No signup, instant results.
200+ Calculators
· Finance
· Health & Fitness
· Math & Science
196
Free Tools
⭐ Featured
Reverse GST Calculator
Extract the original price and GST amount from a GST-inclusive total.
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Income Tax Calculator
Calculate income tax under Old and New Regime for FY 2024-25.
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TDS Calculator
Calculate TDS on salary, FD interest, rent, professional fees and more...
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GST Calculator
Calculate GST amount, CGST, SGST and IGST for any invoice amount.
GST Late Fee Calculator
Calculate GST late filing fees for GSTR-1, GSTR-3B and annual returns.
Advance Tax Calculator
Estimate advance tax liability and instalment due dates.
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Salary / CTC Calculator
Convert CTC to take-home salary after PF, professional tax and income...
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EPF / PF Calculator
Calculate EPF corpus, interest and employer/employee contributions.
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NPS Calculator
Calculate National Pension System returns, maturity and tax benefits.
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EMI Calculator
Calculate monthly EMI for loans with amortization schedule.
SIP Calculator
Calculate SIP returns and maturity amount for investments.
Compound Interest Calculator
Calculate compound interest with flexible compounding periods.
ELSS Calculator
Estimate ELSS returns and tax savings with 3-year lock-in SIP.
Lump Sum Investment Calculator
Calculate future value of a one-time lump sum investment.
Step-Up SIP Calculator
Calculate returns on SIP with annual step-up increment.
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Home Loan EMI Calculator
Calculate home loan EMI, total interest and amortisation schedule.
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Car Loan EMI Calculator
Calculate car loan EMI and total interest payable instantly.
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Auto Loan Calculator
Calculate monthly car loan payments including trade-in, sales tax and...
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Refinance Calculator
Compare your current mortgage against a refinance option. See monthly...
Personal Loan EMI Calculator
Calculate personal loan EMI for any loan amount and tenure.
Education Loan EMI Calculator
Calculate EMI and total cost for education loans.
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401(k) Calculator
Project your 401(k) balance at retirement with employer match, salary...
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Roth IRA Calculator
Calculate tax-free Roth IRA growth and projected retirement income.
IRA Calculator
Compare Traditional vs Roth IRA after-tax values and monthly retiremen...
RMD Calculator
Calculate your Required Minimum Distribution from IRA/401(k) using the...
Pension Calculator
Estimate your defined benefit pension income based on years of service...
Social Security Calculator
Estimate Social Security benefits at ages 62, 67 and 70 and find your...
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Profit Margin Calculator
Calculate gross, operating and net profit margin for any business.
Break-Even Calculator
Find the break-even point in units and revenue for your business.
Markup Calculator
Calculate selling price from cost and markup percentage, or vice versa...
VAT Calculator
Add or remove VAT at any rate from a price. Works for any country.
Working Capital Calculator
Calculate net working capital and current ratio for your business.
Payback Period Calculator
Calculate simple and discounted payback period for investments.
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Currency Converter
Convert between 150+ world currencies using live exchange rates.
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Savings Calculator
Calculate how your savings grow over time with regular contributions a...
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Take-Home Paycheck Calculator
Calculate your US net take-home pay after federal tax, state tax, FICA...
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Percent Off Calculator
Calculate sale price, discount amount or percentage saved for any disc...
Percentage Calculator
Calculate percentages, percentage change, and more.
Savings Goal Calculator
Calculate how much to save monthly to reach a financial goal.
Stamp Duty Calculator
Estimate stamp duty and registration charges on property purchase in I...
Rental Yield Calculator
Calculate gross and net rental yield on any property investment.
Home Affordability Calculator
Find out the maximum home loan you can afford based on income.
Rent vs Buy Calculator
Compare the long-term financial cost of renting versus buying a home.
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BMI Calculator
Calculate your Body Mass Index and health category.
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Body Fat % Calculator
Calculate your body fat percentage using the accurate Navy method.
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Calorie Deficit Calculator
Find your daily calorie deficit target for steady, sustainable weight...
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Macro Calculator
Calculate your ideal daily protein, carb and fat targets for any goal.
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Pregnancy Calculator
Calculate your due date, gestational age and key pregnancy milestones...
Age Calculator
Calculate exact age from birth date to today.
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Fraction Calculator
Add, subtract, multiply and divide fractions with automatic simplifica...
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Statistics Calculator
Calculate mean, median, mode, variance, standard deviation and more fr...
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Scientific Calculator
Full scientific calculator with trig, log, exponents, memory and calcu...
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Area Calculator
Calculate area and perimeter for 10 shapes: square, rectangle, circle,...
GCF & LCM Calculator
Find the Greatest Common Factor and Least Common Multiple for any set...
Quadratic Equation Solver
Solve ax² + bx + c = 0 and get real or complex roots with step-by-step...
Business Days Calculator
Count working days between two dates or add business days to a start d...
Work Hours Calculator
Calculate total work hours, overtime and pay across a working week.
Age in Days Calculator
Find your exact age in days, hours and minutes — and countdown to your...
Days Until Calculator
Live countdown to any future date in days, hours, minutes and seconds.
Time Duration Calculator
Add or subtract multiple time durations and convert between time forma...
Day of the Week Calculator
Find the day of the week for any date. Shows ISO week number, day of y...
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Temperature Converter
Convert between Celsius, Fahrenheit, Kelvin and Rankine instantly.
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Length Converter
Convert between metres, feet, inches, kilometres, miles and more lengt...
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Weight Converter
Convert between kilograms, pounds, ounces, grams, stone and more weigh...
Area Converter
Convert between square metres, acres, hectares, square feet and more a...
Volume Converter
Convert between litres, gallons, cups, fluid ounces and more volume un...
Speed Converter
Convert between km/h, mph, m/s, knots and Mach.
Gas Mileage Calculator
Calculate MPG and L/100km from odometer readings or direct distance an...
Wind Chill Calculator
Calculate wind chill temperature using the NWS formula and see frostbi...
Heat Index Calculator
Calculate the heat index (feels-like temperature) from temperature and...
BTU Calculator
Calculate BTU needed to heat or cool a room, or convert BTU to kWh, jo...
Voltage Drop Calculator
Calculate voltage drop in electrical wire runs for any gauge, length a...
Resistor Calculator
Decode resistor colour bands (4 or 5 band) and calculate series/parall...
Concrete Calculator
Calculate how many bags of concrete you need for slabs, columns, steps...
Square Footage Calculator
Calculate square footage for multiple rooms with different shapes and...
Tile Calculator
Calculate how many tiles you need for any room including waste percent...
Roofing Calculator
Calculate roof area, shingle squares and bundles needed from footprint...
Mulch Calculator
Calculate cubic yards or bags of mulch needed for any garden bed area...
Gravel Calculator
Calculate volume and weight of gravel, sand or topsoil needed for any...
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GPA Calculator
Calculate semester and cumulative GPA on a 4.0 or 5.0 scale with dynam...
Unit Converter
Convert between length, weight, temperature, and more.
Grade Calculator
Calculate your weighted grade average or find what score you need on y...
Golf Handicap Calculator
Calculate your WHS golf handicap index from score differentials using...
Random Number Generator
Generate random numbers in any range, roll dice (d4–d100) or flip a co...
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Mortgage Calculator
Calculate monthly mortgage payments with full amortization schedule.
Keyword CPC Calculator
Estimate cost-per-click and monthly budget for keywords.
Home Loan Balance Transfer Calculator
Compare home loan transfer savings with EMI and interest analysis.
Freelancer Tax Calculator
Estimate income tax for freelancers with deductions under new and old...
Crypto Tax Calculator
Calculate crypto capital gains tax for India at 30% flat rate.
SWP Calculator
Calculate Systematic Withdrawal Plan monthly income from mutual funds.
Frequently Asked Questions
Yes. Our GST calculator supports all current rates — 3%, 5%, 12%, 18% and 28% — and shows CGST/SGST breakdown. The income tax calculator is updated for FY 2024-25 with both Old and New Regime slabs including the revised ₹75,000 standard deduction under the New Regime.
It covers the most common deductions: standard deduction, HRA, 80C (up to ₹1.5L), 80D, and home loan interest. For complex situations involving capital gains, business income, or foreign income, consult a CA.
Use the standard SIP calculator for a fixed monthly investment. Use the Step-Up SIP calculator if you plan to increase your SIP amount each year (highly recommended — small annual increments dramatically increase your corpus). Use the ELSS calculator if you want the 80C tax benefit alongside your SIP returns.
Using the standard formula: EMI = P × r × (1+r)ⁿ / ((1+r)ⁿ − 1), where P is the principal, r is the monthly interest rate, and n is the number of months. Our calculator also shows a 12-month amortisation schedule.
All 58 calculators are completely free with no account required. They run entirely in your browser — no data is sent to our servers.