Calculators
Online calculators: percentages, dates, chmod, cron, regex. Essential developer tools.
All Calculators Tools
Date Diff Calculator
Calculate difference between dates, working days, age. Add or subtract time from a date.
Open tool →Chmod Calculator
Calculate Unix permissions: convert between numeric (755) and symbolic (rwxr-xr-x). Common presets included.
Open tool →Cron Expression Builder
Build cron expressions visually. Preview next 5 executions, common presets and cheat sheet.
Open tool →Percentage Calculator
Calculate percentages: X% of Y, percentage change, margin vs markup. 4 calculation modes.
Open tool →A/B Test Calculator
Calculate sample size for A/B tests at 90%, 95% or 99% confidence. Enter conversion rate, MDE and visitors to get sample size and estimated duration.
Open tool →German Company Pension (bAV) Calculator
Calculate German company pension (bAV) 2026. Entgeltumwandlung, 15% employer contribution, tax savings and estimated monthly pension.
Open tool →German Child Benefit Calculator
Calculate German Kindergeld 2026: 255 EUR/month per eligible child. Automatic eligibility check by age (up to 18/21/25) and training status.
Open tool →German Minijob Fixed Contributions Calculator
Calculate German Minijob fixed employer contributions 2026: RV 15%, KV 13%, Lohnsteuer 2%, U1 0.6%, U2 0.24%, Insolvenzgeld 0.06%.
Open tool →French Supplementary Pension (AGIRC-ARRCO) Simulator
Estimate your AGIRC-ARRCO supplementary pension 2026. Point value 1.4159 EUR. Calculate points and monthly pension with coefficient de solidarité.
Open tool →Swiss AHV/IV/EO Social Insurance Calculator
Calculate Swiss AHV/IV/EO contributions 2026: AHV 8.7%, IV 1.4%, EO 0.45%, ALV 2.2%. Employees and self-employed. ALV ceiling CHF 148,200.
Open tool →Danish ATP Pension Contribution Calculator
Calculate Danish ATP pension contributions 2026: 3 tiers based on weekly hours (18+, 9-17, <9). Employee and employer share.
Open tool →Norwegian Youth Housing Savings Calculator
Calculate Norwegian BSU youth housing savings 2026: 20% tax deduction, max 27,500 NOK/year, 300,000 NOK total, under 34 years.
Open tool →Swedish ROT/RUT Household Deduction Calculator
Calculate Swedish ROT deduction (30% renovations, max 75,000 SEK) and RUT deduction (50% household services, max 50,000 SEK) 2026.
Open tool →Polish ZUS Social Contributions Calculator
Calculate Polish ZUS contributions 2026: emerytalna 9.76%, rentowa 1.5%, chorobowa 2.45%, wypadkowa 1.67% + health contribution 9%. Estimated monthly net.
Open tool →Czech Social & Health Insurance Calculator
Calculate Czech contributions 2026: socialni pojisteni 6.5% employee + 24.8% employer and zdravotni pojisteni 4.5% + 9%. Total employer cost.
Open tool →Czech Self-Employed Contributions Calculator
Calculate Czech OSVC contributions 2026: socialni pojisteni 29.2% + zdravotni 13.5% on 50% of profit + income tax 15%/23%. Estimated net income.
Open tool →German Parental Allowance Calculator 2026
Calculate German Elterngeld 2026: 65-67% of pre-birth net income, min €300, max €1,800/month. Compare Basis-Elterngeld vs ElterngeldPlus with PartnerschaftsBonus.
Open tool →German Citizens Allowance Calculator 2026
Calculate German Burgergeld 2026 (ex Hartz IV): Regelbedarf €563 for single + KdU housing costs. Calculation for households with children by age group.
Open tool →German Student Financial Aid Calculator 2026
Calculate German BAfoG 2026 for university students: max €992/month. 50% grant + 50% loan (max €10,010 repayable). Based on parental income and assets.
Open tool →German Housing Allowance Calculator 2026
Calculate German Wohngeld 2026 (Wohngeld-Plus): rent subsidy for Mietstufe I-VII. Reformed in 2023 with tripled amounts. Calculation by household size and income.
Open tool →German Short-Time Work Allowance Calculator 2026
Calculate German Kurzarbeitergeld 2026: 60% (67% with children) of net income difference. Enter gross salary, hours reduction percentage and family status.
Open tool →UK State Pension Calculator 2024/25
Calculate UK State Pension 2024/25 based on NI qualifying years. Full pension £221.20/week with 35 qualifying years. Minimum 10 years for any entitlement.
Open tool →UK Help to Buy ISA & LISA Calculator
Compare Help to Buy ISA and Lifetime ISA (LISA) for first-time buyers. 25% government bonus, LISA max £1,000/year. Calculate your total pot including bonus.
Open tool →Dutch State Pension Calculator
Calculate Dutch AOW (state pension). 2% per year of residence, max 50 years. Single 1,459 EUR/month, partners 997 EUR each.
Open tool →Dutch Child Benefit Calculator
Calculate Dutch kinderbijslag (child benefit) 2026. Quarterly: 0-5 years 285.52 EUR, 6-11 years 346.23 EUR, 12-17 years 407.14 EUR.
Open tool →Belgian Flexi-Job Calculator
Calculate Belgian flexi-job net pay 2026: no employee ONSS, no income tax. Minimum hourly rate 12.08 EUR. Employer pays 25% ONSS.
Open tool →Belgian Legal Pension Calculator
Calculate Belgian legal pension 2026. Formula: reference_salary x (years/45) x 60%/12. Max salary 65,874 EUR. Single vs family rate differences.
Open tool →Austrian Child Benefit Calculator
Calculate Austrian Familienbeihilfe 2026: 138-200 EUR/month by age. Kinderabsetzbetrag 67.80 EUR. Mehrkindzuschlag for larger families.
Open tool →Expense Forecaster AI
Upload transaction CSV and get 3-month forecast (Prophet) + anomaly flags (IsolationForest) + AI savings narrative. Privacy: on-prem Ollama.
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