Free Online Calculators - Everyday, Math, Science & Money
16 free calculators with instant results, step-by-step math and copy-ready answers. Everything runs in your browser - nothing is uploaded, ever.
Everyday & General
4 calculatorsThe calculators you reach for daily - units, dates and quick arithmetic.
Arithmetic Calculator
A simple basic calculator for everyday sums - add, subtract, multiply, divide, brackets and percentages with live results.
Unit Converter
29 quantity families - length, area, volume, mass, temperature, data and electrical units - with an all-units table.
Date & Time Calculator
Durations between dates, add or subtract days, weeks and months, and age in years.
All-in-One Calculator
Everyday arithmetic, percentages, averages and conversions in one fast workspace.
Math
2 calculatorsGeometry and statistics with the full working shown, not just an answer.
Science
4 calculatorsPhysics, chemistry, engineering and electrical formulas with step-by-step math.
Physics Calculator
Force, energy, power, pressure and motion with full step-by-step formulas.
Chemistry Calculator
Molar mass, solution concentration, dilutions and stoichiometry helpers.
Engineering Calculator
Core engineering formulas and conversions across mechanical and civil work.
Electrical Calculator
Ohm's law, power, energy cost, voltage drop and wiring basics.
Money & Finance
3 calculatorsLoans, tax and currency - every figure explained line by line.
Lifestyle
3 calculatorsHealth, kitchen and study calculators for everything outside work.
Construction Calculators on AiLoveKit Build
9 calculatorsConcrete, brick, steel, tile, paint, plaster, excavation, cost and quantity - together with projects, BOQ sheets and rate books on build.ailovekit.com.
Concrete Calculator
Cement bags, sand, aggregate and water from slab dimensions and mix ratio.
Brick Calculator
Brick count plus mortar cement and sand for any wall size and mix.
Steel Calculator
Rebar weight per meter and total order weight using d²/162.28.
All 9 construction calculators
Tile, paint, plaster, excavation, cost and quantity too - open the Build hub.
Calculators That Show Their Work
Every calculator on this page prints the formula it used, the values it plugged in and the arithmetic in between - so you can check any answer by hand. Results copy to the clipboard or download as CSV, and your recent calculations stay in your browser history only.
Private by Design
- Zero uploads - all math runs in JavaScript on your device.
- No accounts - nothing to sign up for, nothing to lose.
- Works offline - once loaded, the calculators keep working without a connection.
Estimating a build? The Construction Cost Calculator on AiLoveKit Build turns these quantities into a full project estimate.