Calculator Guides
20 guides to picking and using the right calculator
Best UK Tax Calculators 2026
Take-home pay, student loans, salary sacrifice, pensions and the £100k tax trap, compared with HMRC and other UK tools.
How to Calculate Personal Allowance Over £100k
How much personal allowance you lose over £100k, how the trap works, and how pension contributions restore it.
Salary Sacrifice UK Guide
When salary exchange beats personal pension contributions, and the real tax and NIC saving.
Best UK Pension Calculators 2026
Retirement pot projections, salary sacrifice planning and FIRE numbers, compared with Which? and other UK pension tools.
Best UK Property Calculators 2026
Stamp duty (SDLT), mortgage payments, buy vs rent and rental yield, with the Scotland and Wales equivalents.
Best UK Investment Tax Calculators 2026
Capital gains tax, dividend tax, inheritance tax and the high income child benefit charge.
Best Freelance Calculators UK
UK day rate, contractor vs employee, W2 to 1099 conversion, side hustle profit and consulting rates.
Best US Tax Calculators 2026
Federal tax brackets, paycheck withholding, self-employment tax, quarterly estimates and capital gains.
Best Singapore Calculators 2026
CPF take-home pay, employer CPF and SDL cost, income tax, Buyer and Seller Stamp Duty, GST and utility bills.
Best Salary and Income Calculators 2026
Hourly to salary, pay raise impact, overtime pay, job offer comparison and remote work savings.
Best Savings & Investment Calculators
Compound interest, savings goals, net worth, ROI, debt payoff, inflation and emergency fund planning.
Best Business & Startup Calculators
Break even analysis, profit margins, SaaS metrics, startup costs, pricing and employee costs.
Best Home Improvement Calculators
How much paint, tile, flooring, mulch and fencing you need, plus solar savings and electricity costs.
Best Car and Transport Calculators 2026
Electric vs petrol running costs, fuel costs, buy vs lease and CO2 emissions.
Best Health & Fitness Calculators
BMI, body fat percentage, TDEE, calorie needs, macro splits, sleep cycles and running pace.
Best Baby and Family Planning Calculators 2026
Due date, first-year baby costs, nursery costs, ovulation tracking, pet costs and dog age.
Best Wedding & Event Calculators
Wedding budget, alcohol quantities, party drinks, catering amounts, seating plans and birthday parties.
Best Homebrewing Calculators
ABV, IBU, mash water and priming sugar, plus candle wax, soap lye and clay shrinkage.
Best Engineering Calculators 2026
CNC speeds and feeds, tap drill sizes, pipe flow, Reynolds number, pressure drop and ideal gas law.
Best Math and Everyday Calculators 2026
Percentages, unit conversion, discounts, tips, age, date differences, currency and GPA.