Skip to main content

Loading calculators...

OneBooks GST helps Indian e-commerce sellers, CAs, and accountants automate GSTR-1 filing, bank statement parsing, Tally/Miracle export, and client communication from one simple dashboard.

Address

Shop No A/4, 1st Floor, Gopinath Complex, Sagar Society, Near Ashadeep School-6, Varachha, Surat, Gujarat-395006

Contact

+91 6353341499
+91 7284897023
info@onebooksgst.in

Helpful Links

About Us
Support
Data Deletion
Financial Calculators
Changelog
Site Map

Trust & Security

Built for Indian GST, marketplace, and accounting workflows

GST-focused workflows, secure processing, and public policy pages in one compact view.

Encrypted

2FA

Payments

Policies

© 2026 ONEBOOKSGST SOLUTION PRIVATE LIMITED. All rights reserved.

Privacy Policy Terms of Service Refund & Cancellation Cookie PolicyEncrypted Connection

Calculator hub

Browse live finance calculators in a card-first layout

This hub provides essential financial calculators to help you make informed decisions about loans, investments, taxes, and retirement planning.

Tools

35

Live Result

Instant

Layout

Cards

Search for Specific Financial Tools

Search by goal or tool name

Search by calculator name, product type, or planning goal to reach the right tool faster. You can look for terms such as NSC, ELSS, HRA, SWP, loan eligibility, take-home salary, retirement corpus, brokerage cost, or inflation impact.

Search

Retirement & Cash Flow

Financial Independence

FeaturedLive page

Financial independence planner

Estimate the corpus and monthly savings needed to reach financial independence.

Useful for FIRE-style planning

Factors in expenses, returns, and horizon

Shows target corpus and monthly savings

Retirement & Cash FlowExplore

Loans & EMI

Home Loan

FeaturedLive page

Home loan EMI and cost

Estimate EMI for a property purchase after your down payment.

Shows loan-to-value impact

Useful for home purchase affordability planning

Compares tenure against total interest cost

Loans & EMIExplore

Investing & Savings

SIP

FeaturedLive page

SIP growth estimate

Project how monthly investing compounds over time, including yearly step-up.

See maturity value and return contribution split

Add yearly step-up to model salary-linked investing

Useful for goal-based investing discussions

Investing & SavingsExplore

Tax & Salary

Income Tax

FeaturedLive page

Income-tax estimate

Quickly compare tax impact using current old/new regime rules and basic personal profile assumptions.

Supports salaried vs non-salaried assumptions

Includes age-based old regime slab selection

Best used for estimate-level planning, not final filing

Tax & SalaryExplore

Choose a category

Explore Our Financial Calculator Categories

Loans & EMI

Loans & EMI Calculators

Compare EMI, eligibility, interest rate, and repayment tools for everyday borrowing decisions.

7 live calculators

Open categoryView page

Investing & Savings

Investing & Savings Calculators

Explore SIP, lumpsum, PPF, RD, FD, and long-term compounding tools in one place.

16 live calculators

Open categoryView page

Tax & Salary

Tax & Salary Calculators

Estimate take-home pay, GST, HRA, gratuity, and income-tax impact with India-focused rules.

6 live calculators

Open categoryView page

Retirement & Cash Flow

Retirement & Cash Flow Calculators

Plan NPS, APY, SWP, Sukanya, SCSS, MIS, and financial independence targets.

4 live calculators

Open categoryView page

Trading & Markets

Trading & Markets Calculators

Review brokerage, stock average, and market-transaction tools before you place a trade.

2 live calculators

Open categoryView page

Loans & EMI

6 calculators

Loans & EMI

EMI

Borrowing planner

Loan EMI breakdown

Estimate monthly EMI, interest cost, and total repayment for standard loans.

Best for personal, education, and general-purpose loans

Shows EMI, interest cost, and total payable

Loans & EMIOpen calculator

Loans & EMI

Car Loan

Vehicle financing

Car loan EMI and cost

Estimate EMI for a car purchase after factoring in your down payment.

Shows loan amount after down payment

Useful for vehicle purchase budgeting

Loans & EMIOpen calculator

Loans & EMI

Home Eligibility

Borrowing capacity

Home loan eligibility

Estimate the loan amount you may qualify for based on income and obligations.

Uses a FOIR-style EMI capacity estimate

Shows max eligible EMI and principal

Loans & EMIOpen calculator

Loans & EMI

Simple Interest

Interest basics

Simple interest calculator

Calculate interest and maturity using a straight-line simple interest formula.

Ideal for classroom or quick planning use

Shows interest earned and total amount

Loans & EMIOpen calculator

Loans & EMI

Flat vs Reducing

Loan comparison

Flat vs reducing rate

Compare a flat-rate loan against a reducing-balance loan on the same amount.

Shows monthly EMI difference

Useful for lender comparison

Loans & EMIOpen calculator

Loans & EMI

Interest Rate

Reverse calculation

Interest rate calculator

Solve the implied annual rate from principal, maturity value, and tenure.

Useful when you know the ending value

Works with compounding assumptions

Loans & EMIOpen calculator

Investing & Savings

15 calculators

Investing & Savings

EPF

Retirement planning

EPF corpus projection

Estimate future provident fund corpus with opening balance, monthly contribution, and yearly growth.

Tracks current balance separately from future deposits

Useful for long-term retirement estimates

Investing & SavingsOpen calculator

Investing & Savings

FD

Capital preservation

Fixed deposit maturity

Estimate maturity value using tenure, rate, and compounding frequency.

Useful for bank FD comparison

Shows maturity amount and earned interest

Investing & SavingsOpen calculator

Investing & Savings

Step Up SIP

Wealth planning

Step-up SIP projection

Estimate a SIP where your monthly contribution rises every year.

Useful for income growth and career progression planning

Shows how annual step-ups affect the corpus

Investing & SavingsOpen calculator

Investing & Savings

Lumpsum

One-time investing

Lumpsum investment growth

Estimate how a one-time investment can compound over a chosen period.

Best for windfalls and one-time surplus cash

Shows invested amount, returns, and maturity

Investing & SavingsOpen calculator

Investing & Savings

PPF

Long-term savings

PPF maturity projection

Project PPF maturity using annual contributions and annual compounding.

Use it to plan the yearly deposit amount

Shows estimated corpus and total interest

Investing & SavingsOpen calculator

Investing & Savings

RD

Recurring savings

Recurring deposit maturity

Estimate RD maturity from monthly deposits and compounding.

Useful for disciplined monthly savings

Shows invested amount, interest, and maturity

Investing & SavingsOpen calculator

Investing & Savings

NSC

Small savings

NSC maturity projection

Estimate National Savings Certificate maturity using annual compounding.

Good for fixed-income and tax planning

Shows maturity and interest earned

Investing & SavingsOpen calculator

Investing & Savings

SCSS

Senior citizen savings

SCSS maturity projection

Estimate senior citizen savings income with quarterly interest payouts.

Shows quarterly interest and maturity value

Useful for retirement income planning

Investing & SavingsOpen calculator

Investing & Savings

Sukanya

Girl child savings

Sukanya Samriddhi projection

Project maturity value for annual contributions under Sukanya Samriddhi assumptions.

Uses contribution years and maturity horizon

Useful for long-term child education planning

Investing & SavingsOpen calculator

Investing & Savings

Post Office MIS

Monthly income

Post Office MIS projection

Estimate monthly interest income from a post office monthly income scheme.

Shows monthly income and total received

Useful for fixed-income cash flow planning

Investing & SavingsOpen calculator

Investing & Savings

Mutual Fund Returns

Investment growth

Mutual fund return estimate

Estimate either SIP or lumpsum mutual fund growth from a single calculator.

Switch between SIP and lumpsum modes

Good for comparing fund growth assumptions

Investing & SavingsOpen calculator

Investing & Savings

Inflation

Future value

Inflation impact calculator

Estimate how today’s amount changes under future inflation assumptions.

Useful for expense and goal planning

Shows future cost and value erosion

Investing & SavingsOpen calculator

Investing & Savings

Compound Interest

Compounding

Compound interest calculator

Estimate how a principal grows with compounding over time.

Useful for savings and debt comparisons

Shows compound interest earned

Investing & SavingsOpen calculator

Investing & Savings

CAGR

Growth rate

Compound annual growth rate

Work out the annualized growth rate between an initial and final value.

Useful for comparing investments over time

Shows absolute gain and growth rate

Investing & SavingsOpen calculator

Investing & Savings

ELSS

Tax-saving investment

ELSS return estimate

Estimate ELSS growth while keeping the tax-saving lock-in in view.

Useful for Section 80C planning

Shows the eligible deduction amount

Investing & SavingsOpen calculator

Tax & Salary

5 calculators

Tax & Salary

HRA

Salary structuring

HRA exemption estimate

Estimate exempt and taxable HRA using salary, rent, and city classification.

Supports old and new regime guidance

Shows metro and non-metro exemption logic

Tax & SalaryOpen calculator

Tax & Salary

Gratuity

Exit benefits

Gratuity payout estimate

Estimate gratuity based on last drawn salary, service years, and employer coverage.

Supports covered and non-covered employer calculation logic

Handles partial-year and statutory cap guidance

Tax & SalaryOpen calculator

Tax & Salary

GST

Tax operations

GST amount planner

Split inclusive or exclusive values into taxable amount, GST amount, and CGST/SGST or IGST.

Useful for invoice review and price planning

Supports inclusive and exclusive tax modes

Tax & SalaryOpen calculator

Tax & Salary

Salary

Take-home pay

Salary take-home calculator

Estimate monthly and annual take-home salary from CTC and monthly deductions.

Useful for offer negotiation and budget planning

Separates bonus, PF, and professional tax

Tax & SalaryOpen calculator

Tax & Salary

TDS

Tax deduction

TDS estimate

Estimate annual tax and a simple monthly TDS value using age and deduction inputs.

Useful for salary and income planning

Compares old and new regime tax

Tax & SalaryOpen calculator

Retirement & Cash Flow

3 calculators

Retirement & Cash Flow

NPS

Retirement planning

NPS retirement projection

Project retirement corpus, lump-sum withdrawal, and annuity-driven pension estimate.

Models current corpus with monthly contribution growth

Shows nominal and inflation-adjusted pension view

Retirement & Cash FlowOpen calculator

Retirement & Cash Flow

SWP

Cash flow planning

Systematic withdrawal plan

Estimate how long a corpus can support regular monthly withdrawals.

Shows corpus depletion timing and remaining balance

Useful for retirement cash flow planning

Retirement & Cash FlowOpen calculator

Retirement & Cash Flow

APY

Retirement contribution

APY contribution planner

Estimate the monthly contribution needed to target a desired pension.

Useful for APY-style retirement planning

Shows corpus needed and contribution estimate

Retirement & Cash FlowOpen calculator

Trading & Markets

2 calculators

Trading & Markets

Brokerage

Trading costs

Brokerage and charges estimator

Estimate trading charges using brokerage, taxes, and exchange fees.

Useful for delivery and intraday trade checks

Shows gross P&L versus net P&L

Trading & MarketsOpen calculator

Trading & Markets

Stock Average

Position management

Stock average calculator

Work out your weighted average buy price and current unrealized P&L.

Add multiple buy lots

Useful for averaging down and tracking positions

Trading & MarketsOpen calculator

Common calculator questions

Frequently asked questions

Estimate cautions

Before you rely on the estimate

The calculator pages are planning friendly, but lender charges, final bank rates, statutory changes, and tax declarations can change the real number.

For final filing or compliance numbers, validate with your CA, payroll policy, lender term sheet, or GST invoice rules before submission.

The dedicated calculator pages include live inputs and a simple chart to help users understand the output faster.