Calculate mortgage payments, investment growth, percentages, GPA, age and health estimates. Search free tools and see the formulas behind your results.
Browse 101 free calculator tools · No sign-up required
Calculate Instantly
Basic and scientific calculations directly on the homepage.
What would you like to calculate?
History remains in this page session and clears on reload.
Featured Tools
Quick access to finance, health and math tools.
Calculate your mortgage principal and interest, monthly housing costs, total interest, and estimated payoff timeline.
Open Calculator →Calculate percentages, percentage increase and decrease, reverse percentages, and percentage differences with clear results.
Open Calculator →Calculate your adult body mass index using kilograms and centimeters or pounds and feet/inches.
Open Calculator →Calculate exact age in years, months, and days, with birthday countdown and total days lived.
Open Calculator →Calculate trigonometry, logarithms, square roots, exponents, factorials and arithmetic with a free scientific calculator.
Open Calculator →Calculate compound interest and future investment value with daily, monthly, quarterly, or yearly compounding. Compare growth over time.
Open Calculator →Estimate fixed-rate installment payments, interest cost and the effect of extra principal payments. See an annual declining-balance schedule for planning.
Open Calculator →Estimate resting energy use, activity-adjusted maintenance calories, and a simple target for maintaining, gaining, or losing weight. Estimates apply to adu
Open Calculator →Add, subtract, multiply and divide fractions online. Get the simplest fraction, decimal equivalent and mixed-number breakdown.
Open Calculator →Calculate GPA from course grades, credit-weighted CGPA across semesters, and percentage using your institution’s specified formula.
Open Calculator →Calculate tips, add tax and split restaurant bills between friends.
Open Calculator →Estimate future prices and the changing purchasing power of money using an assumed annual inflation rate.
Open Calculator →Find the right tool
Start with the topic you need, then compare tools and review their calculation assumptions.
Explore loans, mortgages, retirement savings and investment growth using clearly stated rate and payment assumptions.
Explore 46 finance tools →Explore BMI, calorie, body fat, sleep and hydration estimates. Results are educational, not a medical diagnosis.
Explore 14 health tools →Find percentage, fraction, GPA, time and measurement tools for homework, business and daily calculations.
Explore 41 math & utility tools →Browse by category or use the search bar above.
Calculate your mortgage principal and interest, monthly housing costs, total interest, and estimated payoff timeline.
Calculate Now →Calculate percentages, percentage increase and decrease, reverse percentages, and percentage differences with clear results.
Calculate Now →Calculate your adult body mass index using kilograms and centimeters or pounds and feet/inches.
Calculate Now →Calculate exact age in years, months, and days, with birthday countdown and total days lived.
Calculate Now →Calculate trigonometry, logarithms, square roots, exponents, factorials and arithmetic with a free scientific calculator.
Calculate Now →Calculate compound interest and future investment value with daily, monthly, quarterly, or yearly compounding. Compare growth over time.
Calculate Now →Estimate fixed-rate installment payments, interest cost and the effect of extra principal payments. See an annual declining-balance schedule for planning.
Calculate Now →Estimate resting energy use, activity-adjusted maintenance calories, and a simple target for maintaining, gaining, or losing weight. Estimates apply to adu
Calculate Now →Add, subtract, multiply and divide fractions online. Get the simplest fraction, decimal equivalent and mixed-number breakdown.
Calculate Now →Calculate GPA from course grades, credit-weighted CGPA across semesters, and percentage using your institution’s specified formula.
Calculate Now →Calculate tips, add tax and split restaurant bills between friends.
Calculate Now →Estimate future prices and the changing purchasing power of money using an assumed annual inflation rate.
Calculate Now →Estimate 401(k) retirement savings with employer matching, annual raises, investment returns and inflation.
Calculate Now →Estimate your monthly auto loan payment including down payment, trade-in balance, sales tax and financed fees.
Calculate Now →Estimate compound annual growth rate from a starting and ending value.
Calculate Now →Use this free car loan emi calculator for fast, clear results on any device.
Calculate Now →Use this free car payment calculator for fast, clear results on any device.
Calculate Now →Use this free cost of living calculator for fast, clear results on any device.
Calculate Now →Estimate how long credit card debt takes to repay with fixed monthly payments and extra payments.
Calculate Now →Use this free crypto profit calculator for fast, clear results on any device.
Calculate Now →Estimate debt payoff date, interest expense and the effect of extra payments.
Calculate Now →Use this free down payment calculator for fast, clear results on any device.
Calculate Now →Calculate your emergency savings target, months already covered and how long it may take to fill a savings gap.
Calculate Now →Estimate fixed-rate loan EMIs, total interest paid, and overall repayment cost using loan amount, annual interest rate, and repayment tenure.
Calculate Now →Use this free epf calculator for fast, clear results on any device.
Calculate Now →Estimate fixed deposit maturity, compound interest and periodic interest payouts with adjustable rates and tenure.
Calculate Now →Use this free gratuity calculator for fast, clear results on any device.
Calculate Now →Calculate GST-inclusive and GST-exclusive prices, taxable value, and CGST, SGST or IGST using any selected tax rate.
Calculate Now →Explore home equity line of credit costs with rate and balance assumptions.
Calculate Now →Estimate an affordable home price using monthly income, existing debts, down payment, mortgage interest, taxes and insurance.
Calculate Now →Estimate income tax using the inputs and rules described in the tool.
Calculate Now →Use this free investment calculator for fast, clear results on any device.
Calculate Now →Use this free lumpsum calculator for fast, clear results on any device.
Calculate Now →Calculate monthly interest, full months and extra days from the money taken date.
Calculate Now →Add your savings, investments, property and other assets, then subtract debts for an estimated financial snapshot.
Calculate Now →Use this free nps calculator for fast, clear results on any device.
Calculate Now →Use this free paycheck calculator for fast, clear results on any device.
Calculate Now →Use this free personal loan emi calculator for fast, clear results on any device.
Calculate Now →Use this free post office mis calculator for fast, clear results on any device.
Calculate Now →Estimate Public Provident Fund maturity, total deposits, and interest with monthly interest eligibility and annual crediting.
Calculate Now →Estimate recurring deposit maturity, monthly savings, and quarterly-credited interest with a clear year-wise breakdown.
Calculate Now →Compare existing and new home-loan payments, remaining interest, refinance closing costs and simple break-even time.
Calculate Now →Explore mortgage payments, homeowner expenses, estimated future equity and rent over a chosen comparison period.
Calculate Now →Use this free retirement calculator for fast, clear results on any device.
Calculate Now →Project Roth IRA value with monthly deposits, starting balance, annual return and inflation.
Calculate Now →Convert hourly pay into gross daily, weekly, biweekly, monthly and annual earnings based on your work schedule.
Calculate Now →Add sales tax to a pre-tax price or extract tax from a tax-inclusive purchase amount.
Calculate Now →Find the monthly deposit needed to reach a savings target by a deadline.
Calculate Now →Calculate simple interest earned and total principal plus interest with an annual rate and a selected time period.
Calculate Now →Estimate the future value of monthly SIP investments, total invested amount, and potential wealth gained using an expected annual return.
Calculate Now →Use this free ssy calculator for fast, clear results on any device.
Calculate Now →Estimate an average purchase price across multiple stock purchases.
Calculate Now →Use this free swp calculator for fast, clear results on any device.
Calculate Now →Estimate basal metabolic rate using two established equations. Compare calorie needs at rest using age, height, weight and equation sex.
Calculate Now →Estimate body fat percentage from neck, waist, height and hip circumferences using the US Navy method.
Calculate Now →Use this free calorie deficit calculator for fast, clear results on any device.
Calculate Now →Use this free ideal weight calculator for fast, clear results on any device.
Calculate Now →Use this free intermittent fasting calculator for fast, clear results on any device.
Calculate Now →Use this free macro calculator for fast, clear results on any device.
Calculate Now →Use this free ovulation calculator for fast, clear results on any device.
Calculate Now →Calculate running pace, speed and estimated 5K or 10K finishing times using distance and elapsed time.
Calculate Now →Use this free pregnancy due date calculator for fast, clear results on any device.
Calculate Now →Explore possible bedtimes and wake-up times using sleep duration, cycle assumptions and time to fall asleep.
Calculate Now →Use this free target heart rate calculator for fast, clear results on any device.
Calculate Now →Estimate a starting daily fluid target from body weight and exercise minutes, with transparent assumptions.
Calculate Now →Work through algebraic expressions and basic equation problems.
Calculate Now →Calculate fixed-rate loan payments and a principal-versus-interest amortization schedule.
Calculate Now →Compare area measurements across common metric and imperial units.
Calculate Now →Find image and screen proportions for layouts, video and design.
Calculate Now →Work with binary numbers and common number-base representations.
Calculate Now →Use this free concrete calculator for fast, clear results on any device.
Calculate Now →Find the absolute number of calendar days between two valid dates, plus full weeks and an equivalent number of 24-hour periods. Useful for schedules and ti
Calculate Now →Use this free dcf calculator for fast, clear results on any device.
Calculate Now →Calculate the final sale price after one or two sequential percentage discounts, optional sales tax, and total savings. Compare deals without adding discou
Calculate Now →Use this free distance calculator for fast, clear results on any device.
Calculate Now →Estimate energy costs from electricity use and your entered tariff.
Calculate Now →Use this free factor calculator for fast, clear results on any device.
Calculate Now →Estimate one-way or return-trip fuel cost from your distance, consumption rating and local fuel price.
Calculate Now →Find the greatest common factor of integers.
Calculate Now →Use this free gpa to percentage calculator for fast, clear results on any device.
Calculate Now →Calculate weighted course grades and required final exam scores with transparent grading assumptions.
Calculate Now →Use this free height calculator for fast, clear results on any device.
Calculate Now →Use this free hours calculator for fast, clear results on any device.
Calculate Now →Find the least common multiple of integers.
Calculate Now →Use this free molecular weight calculator for fast, clear results on any device.
Calculate Now →Calculate gross margin, gross profit and markup using cost and selling price.
Calculate Now →Find an unknown quantity from two equivalent ratios.
Calculate Now →Generate numbers within a specified range.
Calculate Now →Simplify whole-number ratios using the greatest common divisor and find equivalent ratios.
Calculate Now →Convert numbers between Roman numerals and standard notation.
Calculate Now →Find slope, intercept, direction and line equation from coordinate points.
Calculate Now →Calculate speed, distance or travel time using kilometres or miles with consistent hours-based inputs.
Calculate Now →Calculate sample and population standard deviation from numeric datasets.
Calculate Now →Calculate mean, median, mode, range, sample variance and population standard deviation.
Calculate Now →Add or subtract two durations in hours, minutes and seconds, with automatic carrying and borrowing.
Calculate Now →Use this free time card calculator for fast, clear results on any device.
Calculate Now →Use this free tire size calculator for fast, clear results on any device.
Calculate Now →Convert common length, weight, temperature, area and volume measurements using fixed conversion factors. Switch categories, reverse units and compare metri
Calculate Now →Calculate 3D volumes using common solid geometry formulas.
Calculate Now →Convert weights and masses across familiar measurement units.
Calculate Now →Count words and characters in text.
Calculate Now →No matching calculator found.
RapidCalc brings common financial, health and mathematical calculations into one searchable directory. Each specialist tool explains the inputs, formula or calculation method and important limitations, so you can compare scenarios instead of treating a single result as a guarantee.
For a mortgage, compare loan amount, term and interest rate to estimate the monthly payment. Use savings and investment tools to explore how regular contributions and assumed growth rates affect a future balance. Actual outcomes may differ.
Use BMI to compare weight with height, BMR to estimate resting energy expenditure, and sleep or hydration tools for illustrative planning. These are screening and educational estimates, not personalized medical advice.
Solve practical problems: calculate a 20% discount, add fractions, estimate an exact calendar age or convert familiar units. Check each tool’s rounding rules and measurement conventions before using its output.
Find a tool, enter your values and review the result with the calculator’s assumptions. You can change inputs to compare scenarios.
Search by task or browse Finance, Health and Math & Utility categories.
Check dates, interest-rate periods, units and any special assumptions.
Read the result breakdown and adjust one input at a time to compare outcomes.
Finance and health outputs are educational estimates. Check current rules and seek qualified advice where needed.
Answers about finding calculators, using their results, supported tools and important limitations.
Yes. You can use the calculators available on RapidCalc without a payment to access the calculations.
No account is required to use the calculators currently available on the site.
Results are calculated from your inputs and the methods described on each calculator page. Check units, rounding and assumptions; financial and health estimates are not guarantees or professional advice.
Yes. The site is designed for mobile, tablet and desktop browsers. If an input is difficult to use on your device, try switching between portrait and landscape views.
Explore finance tools for loans and savings, health estimators including BMI and BMR, and math and utility tools for percentages, fractions, dates and unit conversions.
Use the search field near the top of the homepage or browse Finance, Health and Math & Utility categories. Calculator pages explain what they calculate and which inputs they need.
The homepage quick calculator shows recent calculations during the current page session and clears that list on reload. Data handling for other tools or any connected services may differ; consult the site privacy information when available. Avoid entering sensitive personal details.
Yes. You can compare scenarios such as mortgage payments, debt repayment, investment growth and savings goals. Outputs depend on entered assumptions and do not predict actual market returns or lending decisions.
Some calculators let you choose a currency for amounts and display formatting. Selecting a currency does not necessarily convert exchange rates; always check the explanation on the individual tool.
Many tools support worldwide use, including everyday math and measurement calculations. Some products, such as 401(k), Roth IRA, PPF and GST, follow country-specific concepts, so check their assumptions before using them elsewhere.
Yes. The homepage quick calculator has a Scientific Mode, and RapidCalc also provides a dedicated Scientific Calculator page for more advanced calculations.
Tools and explanatory guides may be revised as improvements are made. Tax limits, financial rules and other time-sensitive assumptions are not guaranteed to update automatically; verify current rules from an authoritative source.