Instant answers for finance, health, education, math and everyday life — built for speed, accuracy, and every device.
Plan smarter with our collection of financial calculators — from mortgages and loans to investment returns and business margins.
Understand your body and hit your goals with fast, accurate health calculators.
Tools built for students, teachers and lifelong learners.
From quick percentages to scientific expressions — solve it in seconds.
Handy calculators for the everyday questions life throws at you.
Understand the real cost of driving — fuel, financing, depreciation and lease terms.
Plan your home budget and space with clear, instant answers.
Hand-picked for accuracy and daily usefulness.
Estimate your monthly mortgage payment based on home price, down payment, interest rate and loan term.
See how compound growth turns steady contributions into serious money.
Measure how well an investment performed — in total and per year.
Most used across the CalcCosmos community.
Estimate your monthly mortgage payment based on home price, down payment, interest rate and loan term.
Estimate the monthly payment and total interest for any fixed-rate loan.
See how compound growth turns steady contributions into serious money.
Calculate your body mass index and see which WHO category it falls in.
Estimate the calories you burn each day (TDEE) based on age, sex and activity.
Convert letter grades and credit hours into your weighted grade point average.
Fresh calculators, just landed.
Compute room area in square feet — combine up to three rectangular spaces.
Estimate how much rent you can afford based on gross monthly income.
Estimate your monthly car lease payment from price, residual, money factor and term.
Estimate how much a vehicle is worth after N years at a chosen annual depreciation rate.
CalcCosmos is a growing library of free online calculator tools designed to give you fast, accurate answers without ads getting in the way. Each calculator has its own page — with the formula, a worked example, and answers to the most common questions — so you can trust the math and learn as you go.
Whether you're comparing mortgage scenarios, tracking daily calorie needs, converting fractions, or splitting a restaurant bill, CalcCosmos has a purpose-built tool. Every page is mobile-friendly, loads instantly, and works offline once cached.
New calculators launch every week. Bookmark the ones you use often, or use the search bar above to jump straight to what you need.
Yes. Every calculator on CalcCosmos is free to use with no signup required.
Every calculator uses the standard formulas from finance, science and mathematics. Formulas and worked examples are published on each page so you can verify the math.
No. Calculations run entirely in your browser. Nothing is sent to a server.
Absolutely — new calculators launch every week based on what people search for most.