UK Overtime Pay Calculator 2026/27
Estimate how much overtime pay you keep after UK Income Tax, National Insurance, pension and student loan deductions.
Fuel Pressure Flow Calculator
Adjust injector flow rate for fuel pressure changes using the square-root pressure correction formula.
Fuel Pump Size Calculator
Estimate required fuel pump flow in LPH, GPH, and lb/hr from horsepower, fuel type, BSFC, and safety margin.
Fuel Injector Duty Cycle Calculator
Calculate fuel injector duty cycle from horsepower, injector size, injector count, and BSFC. Check whether your injectors are safe or too small.
Fuel Injector Size Calculator
Estimate fuel injector size in lb/hr and cc/min from horsepower, BSFC, injector count, and duty cycle.
UK Salary Sacrifice Calculator 2026/27
Estimate the take-home impact of pension salary sacrifice, including Income Tax and employee NI savings.
UK Student Loan Repayment Calculator 2026/27
Estimate UK student loan repayments across Plan 1, Plan 2, Plan 4, Plan 5 and Postgraduate loans using current thresholds.
Marriage Allowance: Who Can Claim It?
A plain-English guide to who can claim UK Marriage Allowance, when it helps, when it does not, and how much it can save.
Side Hustle Tax: Trading Allowance vs Expenses
Compare the UK trading allowance with actual expenses and learn which route may reduce taxable side-hustle profit more.
Inside vs Outside IR35: What Changes Your Take-Home Pay?
Inside and outside IR35 change tax route, expenses, pension strategy, risk, and how much of a contractor day rate reaches your bank account.
ChatGPT Plus vs Claude Pro: Which Costs More in 2026?
ChatGPT Plus and Claude Pro are both $20/month in the US, but annual billing, usage style, and upgrade paths change the value equation.
UK Dividend Tax Calculator 2026/27 — Take-Home for Directors
Free UK dividend tax calculator for limited company directors. Live results for 2026/27 and 2025/26, England/Wales/NI and Scotland, with full salary + dividend breakdown.