Online Percentage Calculators
Free calculators for percentages, discounts, loans, and investments. Fast and accurate calculations online.
Basic Calculators
Business Calculators
Investment Calculators
Loan Calculators
Tax Calculators
Date Calculators
Health Calculators
Construction & engineering calculators
Concrete Calculator
Cubic meters and mix
Foundation Calculator
Concrete and rebar
Pipe Calculator
Weight, area, volume
Power Calculator
Watts from current and voltage
Wallpaper Calculator
Wallpaper rolls per room
Fence Calculator
Fence materials by perimeter
Tile Calculator
Tiles for floor and wall
Stairs Calculator
Steps with drawing
Floor Screed Calculator
Sand-concrete M300 mix
Brick Calculator
Bricks and mortar
Roof Calculator
Roof area and angle
Rebar Calculator
Rebar weight and length
Metal Weight Calculator
Metal weight by profile
Lumber Calculator
Lumber cubic meters
Profnastil Calculator
Corrugated sheet panels
Laminate Calculator
Laminate boxes by area
Paint Calculator
Paint by square meter
Cable Cross-Section Calculator
Cable size by load
Heating Calculator
Boiler power by area
Aerated Concrete Calculator
Gas-block walls
Foam-Block Calculator
Foam blocks for walls
Mortar Calculator
Cement and sand
Round Timber Calculator
Log cubage
Drywall Calculator
Drywall sheets and profile
Insulation Calculator
Insulation thickness
Siding Calculator
Siding panels for house
Stretch Ceiling Calculator
Stretch ceiling area and cost
Rafters Calculator
Rafters for gable roof
Linoleum Calculator
Linoleum by area and width
About Percentage Calculators
Our collection of 9 online calculators helps you quickly perform any percentage and financial calculations — from simple percent-of-number to compound interest, loan payments, deposit returns, and margin markup. Each calculator provides instant results with step-by-step formula breakdowns.
All calculators work directly in your browser, require no registration, and are completely free. Results are calculated instantly as you type using standard mathematical and financial formulas. Whether you're calculating a discount for shopping, estimating loan overpayment, or planning investment returns — we have the right calculator.
Benefits of Our Calculators
Calculation Accuracy
We use verified mathematical and financial formulas — annuity calculations for loans, compound interest formula A = P(1 + r/n)^(nt) for investments, and precise floating-point arithmetic for percentages. Results match professional financial tools.
Instant Results
Calculations happen instantly as you type — no submit buttons, no loading. All math runs locally in your browser with zero server latency. Change any input and see the result update in real time.
Examples and Formulas
Each calculator includes the formula used, a step-by-step breakdown of the calculation, and practical usage examples. Learn the math behind the numbers and verify results independently.
FAQ
Are the calculators free?
Yes, all 9 calculators are completely free with no registration, no premium tier, and no usage limits. Calculate percentages, discounts, margins, compound interest, loan payments, and more — as many times as you need, without restrictions.
How accurate are the calculations?
We use standard mathematical and financial formulas verified against industry benchmarks. Compound interest uses the standard formula A = P(1 + r/n)^(nt), loan calculations use annuity payment formulas, and percentage operations use precise floating-point arithmetic. Results match professional financial calculators.
How to save results?
Use the 'Copy' button next to any result to copy it to your clipboard. You can then paste the result into spreadsheets, documents, or messages. All calculations include step-by-step breakdowns that you can also copy for reference or documentation.
Do they work on mobile?
Yes, all calculators are fully responsive and optimized for mobile devices and tablets. The input fields, sliders, and result displays adapt to your screen size. Touch interactions are fully supported — you can use the calculators just as easily on a phone as on a desktop.
Can I see the formulas?
Yes, each calculator displays the mathematical formula used and provides a step-by-step explanation of the calculation. For example, the compound interest calculator shows A = P(1 + r/n)^(nt), and the loan calculator shows the annuity payment formula. This transparency helps you understand and verify the results.