All Free Calculators
Browse all 48 free online calculators on Calculy — organized by category so you can find exactly what you need in seconds. Whether you're planning a mortgage, comparing loan offers, calculating energy savings, or figuring out how much it costs to raise a child, every tool here gives you instant, accurate answers with no login required. Our calculators cover five areas: financial planning, energy and home, auto and transport, everyday utilities, and date and life decisions. All tools are completely free, work on any device, and are built to help you make better decisions with real numbers.
Financial Calculators
See all →- Loan Payment Calculator — Calculate monthly loan payments with overpayment simulation and scenario comparison.
- Mortgage Calculator — Calculate your monthly mortgage payment based on home price and down payment.
- Compound Interest Calculator — See how your money grows with compound interest and inflation-adjusted returns.
- Inflation Calculator — Compare purchasing power across years and calculate minimum return to beat inflation.
- Salary Calculator — Convert annual salary to hourly rate and accurately compare job offers.
- ROI Calculator — Calculate return on investment with NPV, IRR, and a year-by-year timeline.
- Car Loan Calculator — Calculate monthly car loan payments including trade-in, taxes, and extra payments.
- Savings Goal Calculator — Find out how much to save monthly to reach any financial goal on time.
- Leasing Calculator — Calculate monthly lease payments with money factor, residual value, and fees.
- Break-Even Calculator — Find out when your business becomes profitable with break-even point analysis.
- Rent vs Buy Calculator — Compare total cost of renting vs buying a home over any time horizon.
- Depreciation Calculator — Calculate asset depreciation using straight-line or declining balance method.
- Debt Payoff Calculator — Use snowball or avalanche strategy to plan your fastest debt-free date.
- Interest-Only Loan Calculator — Calculate interest-only loan payments and compare with standard amortizing loans.
- Refinance Calculator — Find out if refinancing your mortgage or loan actually saves money long-term.
- APR Calculator — Calculate the true Annual Percentage Rate including all loan fees and costs.
- Loan Affordability Calculator — Find the maximum loan you can afford based on your income and monthly expenses.
- Monthly Budget Calculator — Track income and expenses with the 50/30/20 rule and monthly budget categories.
- Margin Calculator — Calculate profit margin, markup percentage, and selling price from cost.
- Cashflow Calculator — Track monthly income and expenses with savings rate and cash flow analysis.
- Startup Runway Calculator — Calculate how many months your startup can survive before running out of cash.
- Price Markup Calculator — Calculate selling prices, profit margins, and markup percentages from cost.
- Inventory Cost Calculator — Calculate the true cost of holding inventory including capital and storage costs.
Energy & Home Calculators
See all →- Solar Panel ROI Calculator — Calculate solar panel payback period and return on investment for your home.
- Heat Pump Calculator — Calculate heat pump installation costs, annual savings, and payback period.
- Home Energy Calculator — Calculate total home energy costs covering electricity, heating, and water.
- Insulation Savings Calculator — Calculate heating savings from improved home insulation and payback period.
Auto & Transport Calculators
See all →- Total Car Cost Calculator — Calculate the true total cost of car ownership including depreciation and insurance.
- Fuel vs Electric Calculator — Compare total ownership cost between gasoline and electric vehicles over time.
- Lease vs Buy Calculator — Compare the true cost of leasing vs buying a car with NPV and break-even analysis.
Utility Calculators
See all →- Fuel Cost Calculator — Calculate fuel costs for any trip based on distance, consumption, and fuel price.
- Electricity Cost Calculator — Calculate how much any appliance costs to run per day, month, and year.
- Heating Cost Calculator — Calculate annual heating costs based on home area, insulation level, and fuel type.
- Percentage Calculator — Calculate percentages, percentage change, inverse percent, and fraction conversions.
- Tip Calculator — Calculate tips and split restaurant bills between any number of people.
- VAT Calculator — Add or remove VAT from any price with support for 80+ country tax rates.
- Discount Calculator — Calculate sale prices, savings, and stacked discounts with 8 calculation modes.
- Unit Converter — Convert between metric and imperial units for length, weight, and temperature.
- Time Calculator — Add, subtract, and convert time durations — hours, minutes, seconds, and days.
- Area Calculator — Calculate area of rectangles, circles, triangles, and other geometric shapes.
- Volume Calculator — Calculate volume of cubes, cylinders, spheres, cones, and other 3D shapes.
- Concrete Calculator — Calculate how much concrete you need for slabs, foundations, and columns.
- Fraction Calculator — Add, subtract, multiply, and divide fractions with step-by-step solutions.
Date & Life Calculators
See all →- Age Calculator — Calculate your exact age in years, months, days, hours, and minutes.
- Date Calculator — Add or subtract days from any date and find the number of days between dates.
- Pace Calculator — Convert between running pace and speed for training and race planning.
- Relocation Cost Calculator — Estimate all costs of moving to a new city or country, including hidden expenses.
- Child Cost Calculator — Estimate the total cost of raising a child from birth through adulthood.