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Finance Practical online calculations for loans, deposits, VAT, percentages, investments and debt load. Construction Practical calculations for areas, volumes, materials, concrete, roofing, finishes and building systems. Auto Calculations for fuel, trips, EVs, tires, vehicle performance and ownership costs. Date & Time Calculations for dates, intervals, workdays, time durations and time zones. Business Calculations for pricing, profitability, sales, marketing, customers, e-commerce and operations. Energy & Electrical Calculations for electricity use, electrical parameters, batteries, solar energy, backup power and lighting.

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Percentage calculator Percent of a number, change and difference Loan calculator Monthly payment, interest and overpayment Deposit calculator Yield, term and compounding VAT calculator VAT included or added separately Compound interest calculator Investment growth over time

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Margin & Markup Calculator Calculate gross profit, margin, markup and the selling price required for a target margin or markup. Electricity Cost Calculator Calculate electricity use in kWh and running cost from appliance power, operating time and your electricity rate. Concrete Volume Calculator Calculate concrete volume for slabs, footings, walls, beams and round columns with metric and imperial units.

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LUKIK online calculators

LUKIK is a service of practical online calculators for tasks where a clear result matters. Choose a ready-made calculation, browse tools by category or use search to find the calculator you need. Available tools help with loans, percentages, deposits, VAT, compound interest and debt load.

We aim to show more than a final number. Where it is useful, LUKIK explains the formulas, input values and limits behind a calculation, making results easier to check and apply to everyday decisions, work or study. LUKIK calculators are free to use and do not require registration for basic calculations.

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Pricing & Profitability

Margin vs. Markup: What's the Difference and How to Calculate Them Margin and markup are often confused because both express the difference between cost and selling price as a percentage. The key difference is the base: margin is measured against selling price, while markup is measured against cost. That means the same sale will usually have different margin and markup percentages. This guide explains the formulas, worked examples, conversions, and the correct way to set a selling price for a target margin or markup. Cost, selling price, and gross profit A basic margin-and-markup calculation uses three quantities. Cost is the amount you choose to treat as the..

Read 07/09/2026

Energy & Electrical

How to Calculate Electricity Usage and Cost Electricity use is straightforward to estimate when you know an appliance's power, operating time, and the price you pay per kWh. This guide explains watts, kilowatts, kilowatt-hours, the core formulas, worked appliance examples, and direct cost calculations when your kWh usage is already known. Power and energy use are different quantities Watts (W) and kilowatts (kW) describe power: the rate at which a device uses energy at a given moment. Kilowatt-hours (kWh) describe energy used over time. 1 kW = 1000 WEnergy, kWh = Power, kW × Time, hours A 1500 W appliance has a power rating of 1.5 kW. I..