SimpleCalc Blog

Guides, Tips &
How-Tos

Page 8 of 18

NI contribution calculation for self-employed worker
Tax & Business|9 min read

How to Calculate and Pay Class 2 and Class 4 NI

Self-employed workers pay Class 2 and Class 4 National Insurance. Understand the thresholds, rates, and how these contributions affect your state pension entitlement.

2 Nov 2025Read more
Declining metabolic rate chart from 20s to 60s
Health & Fitness|10 min read

How Your Age Affects Calorie Needs and Metabolism

Metabolism slows with age, meaning you need fewer calories. Use our TDEE calculator at different ages to understand why maintaining weight gets harder and how to adapt.

1 Nov 2025Read more
Comparison table of umbrella vs limited company options
Salary & Employment|9 min read

Umbrella Company vs Limited Company for Contractors

UK contractors often choose between an umbrella company and their own limited company. Compare take-home pay, admin burden, and IR35 implications of each route.

31 Oct 2025Read more
House sinking below a line representing mortgage balance
Mortgage & Home Buying|6 min read

Negative Equity: What It Is and How to Escape It

If your home is worth less than your mortgage, you are in negative equity. Understand what causes it, your options if you are stuck, and how to recover.

30 Oct 2025Read more
Baby with monthly milestone cards showing growth
Pregnancy & Family|9 min read

How to Calculate Your Baby's Age in Weeks and Months

Babies grow so fast that tracking their age in weeks matters for milestones and health checks. Use our age calculator to convert between days, weeks, and months.

29 Oct 2025Read more
P60 form with each section explained
Salary & Employment|8 min read

How to Read Your Annual P60 Statement

Your P60 summarises your annual earnings and tax paid. Learn to read every box, check the figures match your payslips, and use it for tax returns and mortgage applications.

28 Oct 2025Read more
Person walking in park with health benefit icons
Health & Fitness|8 min read

The Benefits of Walking 30 Minutes a Day

A daily 30-minute walk reduces heart disease risk, improves mood, and burns calories without the impact of running. Calculate your personal calorie burn based on your weight.

27 Oct 2025Read more
Child BMI growth chart with percentile curves
Health & Fitness|10 min read

BMI for Children: Why It Works Differently Than for Adults

Children's BMI uses age-specific percentile charts rather than fixed ranges. Learn how to interpret your child's BMI and when to be concerned about their weight.

26 Oct 2025Read more
Coffee cup next to running shoes with performance data
Health & Fitness|9 min read

How Caffeine Affects Exercise Performance

Caffeine is a proven performance enhancer for endurance and strength training. Learn the optimal timing, dosage, and when it can help or hurt your workout results.

25 Oct 2025Read more
Small plant growing into a tree representing investment growth
Investment & Retirement|9 min read

How to Start Investing With Just £100 a Month

You do not need thousands to start investing. See how £100 per month in a low-cost index fund can grow to a substantial sum over 10, 20, and 30 years.

24 Oct 2025Read more
Infographic comparing male and female median earnings
Salary & Employment|9 min read

The Gender Pay Gap: What the Numbers Actually Show

Understand the real data behind the gender pay gap in the UK and US, including median pay differences, contributing factors, and how it changes by industry and age.

23 Oct 2025Read more
Height and weight chart showing healthy range bands
Health & Fitness|9 min read

Ideal Weight Calculator: What Should You Actually Weigh?

Ideal weight depends on height, build, age, and body composition. Compare multiple formulas and use our calculator to find a healthy weight range that suits you.

22 Oct 2025Read more
Digital countdown display showing days until an event
Date, Time & Productivity|11 min read

How to Set Up a Countdown for Any Event

Count down to weddings, holidays, birthdays, or retirement. Use our date countdown tool to track days remaining and build excitement for your next milestone.

21 Oct 2025Read more
Two model houses side by side with different price tags
Mortgage & Home Buying|10 min read

Second Home Mortgage: Rules, Rates, and Tax Implications

Buying a second property involves higher deposits, stamp duty surcharges, and different lending criteria. Understand the financial implications before you commit.

20 Oct 2025Read more
Income bar chart showing tax-free portion highlighted
Tax & Business|9 min read

What Is the Tax-Free Personal Allowance and How Does It Work?

Everyone in the UK gets a personal allowance before paying income tax. Learn the current amount, how it reduces at higher incomes, and strategies to protect it.

19 Oct 2025Read more
Person exercising in cold weather with warm clothing
Health & Fitness|8 min read

Winter Fitness: Maintaining Your Routine When It Is Cold

Cold weather and dark mornings make fitness harder to maintain. Practical strategies to keep your workout routine through winter without losing motivation.

18 Oct 2025Read more
Pension pot with abolished lifetime allowance cap removed
Investment & Retirement|10 min read

Lifetime Allowance Abolished: What It Means for Your Pension

The pension lifetime allowance was abolished in 2024. Understand what this means for your pension savings, tax-free lump sum, and retirement planning strategy.

17 Oct 2025Read more
Folic acid supplement with pregnancy planning timeline
Pregnancy & Family|9 min read

Folic Acid and Pregnancy: When to Start and How Much

Folic acid prevents neural tube defects and should ideally be taken before conception. Learn the recommended dose, when to start, and which foods are naturally rich in folate.

16 Oct 2025Read more
Arrows showing percentage increase and decrease examples
Personal Finance|10 min read

Percentage Change Made Simple: Increases, Decreases, and More

Whether tracking price changes, salary increases, or investment returns, percentage change calculations are essential. Learn the formula and use our calculator.

15 Oct 2025Read more
Pie chart showing 50/30/20 budget split
Personal Finance|11 min read

The 50/30/20 Budget Rule: Does It Actually Work?

The 50/30/20 rule splits income into needs, wants, and savings. We test whether this popular budgeting method works in practice and who it suits best.

14 Oct 2025Read more
Person using tape measure for body fat estimation
Health & Fitness|9 min read

How to Calculate Your Body Fat Without Calipers

Estimate your body fat percentage at home using the US Navy method, which requires just a tape measure. Our calculator does the math using your measurements.

13 Oct 2025Read more
Umbrella protecting finances from economic storm clouds
Personal Finance|7 min read

How to Financially Prepare for a Recession

Recessions hit without warning. Build financial resilience now by reducing debt, increasing your emergency fund, and diversifying your income before the next downturn.

12 Oct 2025Read more
Tape measure around waist with healthy range marked
Health & Fitness|9 min read

What Your Waist Circumference Says About Your Health

Waist measurement is a stronger predictor of heart disease risk than BMI. Learn the healthy ranges for men and women and how to measure yours accurately at home.

11 Oct 2025Read more
Clock and calendar showing hourly to annual conversion
Salary & Employment|9 min read

How to Convert Hourly Rate to Annual Salary

Whether you are switching from hourly to salaried work or comparing offers, use our calculator to convert any hourly rate to an equivalent annual salary and vice versa.

10 Oct 2025Read more