45 free tools

Free tools that give you the answer, fast.

Calculators, converters and utilities that run entirely in your browser — no sign-up, no waiting, no nonsense. Every tool shows its formula, a worked example, and honest explanations of what the numbers mean.

PDF Password Protector adds an open password to a PDF, then deletes the upload and the password.

Most used right now

Finance Calculators

EMI Calculator

Calculate your monthly loan EMI instantly. Enter loan amount, interest rate and tenure to see EMI, total interest and total payment with the exact formula.

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Math Calculators

Percentage Calculator

Free percentage calculator: find what percent one number is of another, calculate X% of Y, or reverse a percentage. Instant answers with the formula shown.

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Date & Time Tools

Age Calculator

Calculate your exact age from your date of birth. Get your age in years, months and days, total days lived and your next birthday — free, fast and instant.

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Health Calculators

BMI Calculator

Calculate your Body Mass Index instantly. Enter height and weight to get your BMI, WHO category and healthy weight range.

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Finance Calculators

SIP Calculator

Estimate your monthly SIP's future value. Enter the monthly investment, expected annual return and tenure to see invested amount, gains and maturity value.

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Finance Calculators

GST Calculator

Free GST calculator for India. Add GST to a price or extract GST from a GST-inclusive amount for 0%, 5%, 12%, 18% or 28% slabs with the exact formula.

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Browse by category

Finance Calculators

Loans, investments, tax & salary

Plan loans, compare investments and understand your salary with accurate, transparent finance calculators. Every formula is shown, every assumption is stated — no hidden math.

15 tools →

Math Calculators

Percentages, averages & marks

Quick, exact answers for everyday math — percentages, averages, CGPA conversions and marks calculations students and professionals use daily.

6 tools →

Date & Time Tools

Age, durations & countdowns

Measure time precisely — exact age, days between dates, working days excluding weekends, and live countdowns to the moments that matter.

4 tools →

Unit Converters

Length, weight, temperature

Convert between metric and imperial units instantly, with the exact conversion factors shown so you can verify every result.

3 tools →

Developer Tools

JSON, encoding & generators

Fast, private developer utilities that run entirely in your browser — nothing you paste ever leaves your device.

7 tools →

Student Tools

Attendance & exam planning

Stay on top of attendance requirements and exam prep with calculators built for Indian college and school life.

1 tool →

Health Calculators

BMI, BMR & calorie needs

Understand your body metrics with standard, well-documented formulas. These are informational estimates — not medical advice.

3 tools →

Business Tools

Pricing, margins & billing

Price with confidence — discounts, margins, tips and bill splits calculated instantly and explained clearly.

4 tools →

Text Tools

Count, convert & clean text

Everyday text utilities for writers, students and developers — count words, convert case, and clean up text in seconds.

2 tools →

Why these tools are different

Most calculator sites hide their math, stuff pages with filler text, and make you scroll past three ad blocks to find the input box. We built the opposite: the tool comes first, the exact formula is published underneath, and a worked example shows you how the numbers were produced.

Everything calculates instantly on your device. Financial tools state their assumptions and review dates. Developer tools never send your data anywhere — paste JSON or JWTs with confidence, because nothing leaves your browser.