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42 free calculators. Instant answers. Zero sign-up.

CountCrunch is a collection of 42 free online calculators — finance, investing, health, payroll and the little math of daily life. Every answer appears instantly, with the working shown.

  • Free foreverEvery calculator, every feature, no paywall.
  • No sign-upOpen and calculate. No account, no email, no trial.
  • Private by designCalculations run in your browser — your numbers never leave your device.

Try the SIP calculator Check your BMI

The tools people reach for most — one click, straight to the calculator.

SIP CalculatorProject mutual-fund SIP growth Home Loan EMI CalculatorEMI, interest & schedule for Indian home loans Mortgage CalculatorMonthly payment for any home loan BMI CalculatorBody mass index in seconds Percentage CalculatorX% of Y, percent change & more Age CalculatorExact age in years, months, days Tip CalculatorTip, total & fair bill splits Compound Interest CalculatorWatch your money compound

Finance Calculators

Mortgages, loans, investing and paycheck math — precise answers in seconds.

Mortgage CalculatorFree mortgage calculator: estimate monthly payments, total interest and payoff schedule for any home loan.Biweekly Mortgage Payoff CalculatorSee how biweekly payments shorten your mortgage term and save interest vs standard monthly payments.Mortgage Refinance CalculatorShould you refinance? Compare monthly savings, closing costs and break-even month instantly.Compound Interest CalculatorProject investment growth with compound interest, monthly contributions and flexible compounding.Paycheck CalculatorEstimate your take-home pay per paycheck after federal, state and FICA deductions.Profit Margin CalculatorCalculate profit margin, markup percentage and gross profit from revenue and cost.Markup CalculatorSet the right selling price: compute markup, margin and profit from your costs.401(k) Retirement CalculatorProject your 401(k) balance at retirement with contributions, employer match and growth.Auto Loan CalculatorEstimate car loan monthly payments, total interest and true cost before you buy.Credit Card Payoff CalculatorFind how long until you're debt-free and how much interest you'll pay at any payment.Savings Goal CalculatorHow much to save monthly to hit your goal? Compute required deposits with interest.CAGR CalculatorCompute compound annual growth rate (CAGR) between two values over any period.

Browse all finance calculators →

India Finance Calculators

SIP, EMI, PPF, tax and government schemes — built for Indian investors.

SIP CalculatorEstimate SIP maturity value, invested amount and gains for any monthly SIP plan.Home Loan EMI CalculatorCalculate home loan EMI, total interest and amortization for Indian housing loans.Car Loan EMI CalculatorMonthly EMI, total interest and payable amount for car loans in India.Personal Loan EMI CalculatorEMI, total interest and charges for personal loans from Indian banks.PPF CalculatorProject PPF maturity value, deposits and tax-free interest over 15 years.Income Tax CalculatorCompare old vs new regime tax for FY 2025-26 and find which saves you more.Gratuity CalculatorCalculate gratuity payable under the Payment of Gratuity Act, 1972.HRA Exemption CalculatorCompute HRA tax exemption under Section 10(13A) — metro vs non-metro.FD CalculatorMaturity value and interest for bank fixed deposits with quarterly compounding.RD CalculatorProject recurring deposit maturity, deposits and interest earned.EPF CalculatorEstimate your EPF corpus from monthly PF contributions and interest.SSY CalculatorMaturity and interest for Sukanya Samriddhi Yojana deposits over 21 years.GST CalculatorAdd or remove GST from any amount — CGST/SGST split for all slabs.

Browse all india finance calculators →

Health Calculators

BMI, calories, body fat and pregnancy timelines from validated formulas.

BMI CalculatorCheck your Body Mass Index and weight category instantly — metric and imperial.TDEE & Calorie CalculatorDaily calorie needs (TDEE) via Mifflin-St Jeor, adjusted for activity level.BMR CalculatorYour basal metabolic rate: calories burned at rest, via Mifflin-St Jeor.Body Fat CalculatorEstimate body fat percentage with the US Navy tape-measure method.Pregnancy Due Date CalculatorDue date, conception date and trimester timeline from last period.Ovulation & Fertility CalculatorFertile window and ovulation day from your cycle length.Daily Water Intake CalculatorHow much water per day? Personalized hydration from weight and activity.Ideal Weight CalculatorHealthy weight range for your height via Robinson, Miller and Devine.

Browse all health calculators →

Everyday Calculators

Age, percentages, tips, GPA and dates — the little math of daily life.

Age CalculatorExact age in years, months and days between any two dates.Percentage CalculatorX% of Y, X is what % of Y, and percentage change — all in one.Discount CalculatorSale price, savings and final price with tax on any discount.Tip CalculatorTip, total and per-person share for any bill — split fairly.Date Duration CalculatorDays, weeks and months between two dates, precisely.GPA CalculatorSemester GPA from course grades and credit hours.Love Compatibility CalculatorJust for fun: a playful compatibility score from two names.

Browse all everyday calculators →

Payroll Calculators

Time cards, hours and overtime pay — built for hourly workers.

Time Card CalculatorWeekly hours, overtime and gross pay from clock-in/out times.Overtime Pay CalculatorOvertime hours and pay at time-and-a-half or custom rates.

Browse all payroll calculators →

Why CountCrunch?

  • Formulas you can check. Every calculator names its method and shows the steps — no black boxes.
  • Built for both the US and India. 401(k) and mortgage math sits next to SIP, PPF, EPF and GST — one hub, both worlds.
  • Fast and light. No heavy frameworks, no tracking scripts slowing you down. Pages load instantly, even on old phones.
  • Honest about limits. Estimates are labeled as estimates, fun tools are labeled as fun, and the disclaimer says plainly what these are not.

Frequently asked questions

Are CountCrunch calculators really free?

Yes — every calculator is free with no account, no trial and no usage limits. The site is supported by advertising, kept clearly labeled and away from the calculator controls.

Do I need to create an account?

No. There is no sign-up anywhere on the site. Open a calculator, type your numbers, get the answer.

Is my data private?

Yes. Every calculation runs entirely in your browser. We never receive, store or see the numbers you enter. See the privacy policy for the full details.

How accurate are the calculators?

Each page names the formula it uses — Mifflin-St Jeor for calories, the US Navy method for body fat, standard amortization math for loans — and shows the working so you can verify it. Results are estimates for planning, not professional advice; see the disclaimer.

Can I use these on my phone?

Yes. Every calculator is designed mobile-first with live results as you type, and the pages work offline once loaded.

Which calculator should I start with?

The most-used are the BMI calculator, percentage calculator, SIP calculator and age calculator. Or pick a collection below and browse.