All Calculator – calcnest.blog

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Investment

SIP & Wealth Growth

Calculate future wealth with monthly systematic investments and compounding interest.

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Tax & Business

GST & Sales Tax

Calculate inclusive and exclusive tax amounts for business billing and invoices easily.

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Investment

IRR & CAGR Calculator

Determine Internal Rate of Return (IRR) and annualized growth rate for multi-year cash flows.

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General & Utility

Percentage & Discount

Calculate percentage changes, total ratios, and store discounts in seconds.

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General & Utility

BMI Health Calculator

Calculate Body Mass Index (BMI) and check fitness levels based on metric or US units.

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General & Utility

Standard Basic Calculator

Perform quick day-to-day arithmetic, addition, subtraction, multiplication, and division.

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Loans & Mortgages

Loan EMI & Mortgage

Calculate monthly installments, total interest payable, and loan repayment timelines.

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Tax & Business

Income Tax Estimator

Estimate annual tax liabilities instantly based on official tax slabs for India & USA.

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Investment

FD & CD Fixed Savings

Estimate guaranteed interest payouts for Fixed Deposits (India) or Certificates of Deposit (USA).

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Tax & Business

Take-Home Net Salary

Calculate monthly net payout after deductions, social security, and retirement funds.

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How CalcNest works out your numbers

Every calculator works for both the USA and India and uses a standard, published formula. Here is what each one does, with examples for both countries, so you can check any result by hand.

Standard formulas you can check

Percentages, BMI, loan EMI, SIP and IRR follow textbook maths. The formula sheet lists each one with a worked example.

Income tax is charged slab by slab

In both the USA and India, each slice of income is taxed at its own rate. Rates, deductions and options (such as India's old and new regimes) change from year to year, so confirm the current rules on IRS.gov or incometax.gov.in before you file.

Your inputs stay in your browser

Calculations run on your device. We do not store the numbers you type.

Estimates, not advice

Results are for planning and learning. For tax filing, loans or investments, confirm with your lender, the official source or a qualified professional.

Formula sheet

The formula behind each calculator, with a quick example.

Calculator	Formula	Example
Percentage change	(new − old) ÷ old × 100	80 to 100 is a 25% rise
BMI	weight (kg) ÷ height (m)²	70 kg at 1.75 m gives 22.9, inside the WHO healthy range of 18.5 to 24.9
Loan EMI	P × r × (1+r)ⁿ ÷ ((1+r)ⁿ − 1) P = loan amount, r = annual rate ÷ 12, n = months	India: ₹10,00,000 at 9% for 10 years is about ₹12,668 a month USA: $300,000 at 6.5% for 30 years is about $1,896 a month
SIP	P × ((1+i)ⁿ − 1) ÷ i × (1+i) P = monthly amount, i = annual rate ÷ 12, n = months	India: ₹5,000 a month at 12% for 10 years is about ₹11.6 lakh USA: $500 a month at 7% for 10 years is about $87,000 Assumes a fixed return, which real markets do not guarantee.
Sales tax / GST	add: price × (1 + rate ÷ 100) remove: total ÷ (1 + rate ÷ 100)	USA: $200 at 8% sales tax becomes $216 India: ₹1,000 at 18% GST becomes ₹1,180
Income tax and salary	tax = sum of (income in each slab × that slab's rate) take-home = gross pay − tax India adds 4% cess on the tax	USA (2026, single, $60,000 taxable): $1,240 + $4,560 + $2,112 = $7,912 India (new regime, FY 2026-27, ₹15,00,000 taxable): ₹1,05,000 + 4% cess = ₹1,09,200 Rates change each year; see IRS.gov and incometax.gov.in.
IRR	the rate at which the net present value of all cash flows is 0	Put in 100 and get back 110 after a year: 10%

Found a mistake or have a suggestion? Send us the calculator name and the numbers you used, and we will look into it.

Last reviewed: September 2026