KahurTools — Free Online Calculators

22 calculators

Nord Pool Electricity Price

Live Nord Pool spot prices for Estonia — find the cheapest hours and decide when to run your appliances.

Absence Pay Deduction

Calculate the gross pay reduction for unpaid absence hours.

Salary and Tax Calculator

Calculate net salary, total employer cost, and the breakdown of payroll taxes for Estonia.

Inflation and Purchasing Power Calculator

Calculate the real value of money over time — see how inflation erodes purchasing power.

Vacation Days Optimizer

Plan your vacation smarter: combine vacation days with public holidays and weekends to get maximum consecutive days off. Three optimization schemes.

Working Days Calculator

Calculate working days, public holidays, and shortened workdays for any period.

Currency Converter

Convert between major currencies using official European Central Bank daily rates.

Compound Interest Calculator

See how your savings or investment grow over time with compounding interest.

Percentage Calculator

Calculate percentages instantly. Fill any two fields — the third is computed automatically.

Profit Margin Calculator

Calculate profit margin vs markup — understand the difference and optimise your pricing.

Break-Even Calculator

Find the exact sales volume needed to cover all your costs and break even.

RF Creditor Reference

Generate or validate SEPA RF creditor references. Create QR codes for SEPA payments (mobile banking compatible).

CPM, RPM - Earnings Calculator

Estimate YouTube ad revenue, CPM, RPM, and total earnings from your view count.

Public Wi-Fi Safety Check

Answer 8 questions about your public Wi-Fi habits to get a personal safety score from 0 to 100.

Affiliate Commission Calculator

Calculate affiliate earnings based on sale value, commission rate, and volume.

WordPress Malware Scanner

Free WordPress security scanner — detects malware, viruses, exposed files, known CVEs and 30+ threats

Stripe Fee Calculator

Calculate exact Stripe processing fees and net payout for any transaction amount.

PayPal Fee Calculator

Find out how much PayPal takes from each payment and what you actually receive.

Loan Amortization Calculator

Generate a full amortization schedule showing monthly payments, interest, and principal.

Concrete Calculator

Quickly calculate how much concrete you need for a slab, footing, column, or round post. Enter dimensions, set quantity and waste margin — get the result in m³ and litres instantly.

Area Calculator

Calculate area in square metres for rectangles, triangles, circles, walls, and rooms. Subtract windows and doors to get the net area for painting, tiling, or insulation.

Salary ↔ Hourly Calculator

Convert between annual salary, monthly pay, and hourly rate in both directions.