SimpleCalc Blog

Guides, Tips &
How-Tos

Practical guides on finance, health, tax, and more — written to help you make better decisions with numbers.

Large sum being allocated across different investment types
Investment & Retirement|8 min read

How to Invest a Lump Sum Wisely

Received an inheritance, bonus, or property sale proceeds? Learn the best strategies for investing a large sum including phased investment and tax-efficient wrappers such as the [£20,000 ISA allowance](https://www.gov.uk/individual-savings-accounts) and [pension annual allowance](https://www.gov.uk/tax-on-your-private-pension/annual-allowance).

8 Oct 2026Read more
Shocked person looking at new mortgage payment letter
Mortgage & Home Buying|9 min read

How to Survive a Mortgage Rate Shock

If your fixed deal is ending and rates have jumped, your payments could increase by hundreds. Here are practical steps to prepare for and manage a rate shock.

5 Oct 2026Read more
US map colour-coded by sales tax rate
Tax & Business|10 min read

Sales Tax in the US: A State-by-State Guide

US sales tax rates vary widely by state, county, and city. Find your combined rate, learn what is taxable, and use our calculator for exact sales tax amounts.

1 Oct 2026Read more
Person walking outdoors with calorie counter overlay
Health & Fitness|8 min read

How Many Calories Do You Burn Walking?

Walking is one of the simplest ways to burn calories. Find out how many calories you burn per mile based on your weight, speed, and terrain using our calculator.

28 Sept 2026Read more
Break-even calculator showing units needed to break even
How-To Guides|9 min read

How to Use Our Break-Even Calculator for Business Planning

Enter your fixed costs, variable costs, and selling price to find exactly how many units or how much revenue you need to break even. Essential for pricing decisions.

24 Sept 2026Read more
HMRC registration form being completed online
Tax & Business|8 min read

How to Register as Self-Employed With HMRC

Starting freelance work or a side business requires HMRC registration. A step-by-step guide covering deadlines, what information you need, and your tax obligations.

21 Sept 2026Read more
Night worker with shift premium calculation
Salary & Employment|10 min read

Night Shift Pay: Are You Entitled to Extra?

There is no legal right to night shift premium in the UK, but many employers pay it. Understand the typical rates, health impacts, and how night work affects your overall pay.

17 Sept 2026Read more
VAT calculator showing net, VAT, and gross amounts
How-To Guides|10 min read

How to Use Our VAT Calculator for Business and Personal Use

Add or remove VAT from any amount instantly. Switch between standard (20%), reduced (5%), and zero rates as [set out by HMRC](https://www.gov.uk/vat-rates), and calculate the VAT component of any gross or net price.

14 Sept 2026Read more
Three car finance routes compared with total costs
Comparisons & Explainers|10 min read

PCP vs HP vs Personal Loan: Best Way to Finance a Car

Compare the three main ways to finance a car in the UK. PCP keeps payments low but has a balloon; HP and loans give you ownership. See total costs for each option.

10 Sept 2026Read more
Surveyor inspecting a property with clipboard and torch
Mortgage & Home Buying|10 min read

How Much Does a Surveyor Cost and Do You Need One?

A property survey can reveal costly defects before you buy. Compare homebuyer reports and building surveys, typical costs, and when skipping one is a risky gamble.

7 Sept 2026Read more
Zero-hours contract with worker rights highlighted
Salary & Employment|9 min read

Zero-Hours Contracts: Your Rights and Pay Explained

Zero-hours workers have more rights than many realise, including holiday pay and the right to refuse work. Understand your legal position and calculate your average pay.

3 Sept 2026Read more
Same weight different body composition comparison
Health & Fitness|8 min read

Understanding Muscle-to-Fat Ratio for Health

Two people at the same weight can have very different health outcomes depending on muscle-to-fat ratio. Learn why body composition matters more than the number on the scale.

31 Aug 2026Read more
Percentage change showing salary increase from old to new
How-To Guides|9 min read

How to Use Our Percentage Change Calculator for Tracking Growth

Track salary increases, investment growth, or price changes by calculating the percentage difference between old and new values. A practical everyday math tool.

27 Aug 2026Read more
Time sheet showing overtime hours and pay calculation
Salary & Employment|9 min read

How to Calculate Overtime Pay in the UK and US

Overtime rules differ between the UK and US. Learn when you qualify for time-and-a-half, how to calculate overtime pay, and understand your rights as an employee.

24 Aug 2026Read more
Ultrasound showing twins with key information
Pregnancy & Family|10 min read

Multiple Pregnancies: Twins and the Fertility Connection

Twins are more common with fertility treatments and at older ages. Learn the factors that increase twin likelihood, special care needs, and what to expect.

20 Aug 2026Read more
Two ISA products compared for first-time buyer benefits
Comparisons & Explainers|9 min read

LISA vs Help to Buy ISA: Which Is Better for First-Time Buyers?

Both offer government bonuses for first homes but with different rules. The Help to Buy ISA is closed to new applicants, but existing holders can still compare options.

17 Aug 2026Read more
Employee submitting flexible working request form
Salary & Employment|11 min read

How to Request Flexible Working Arrangements

All UK employees can request flexible working from day one. Learn how to make a strong application, your employer's obligations, and what to do if your request is refused.

13 Aug 2026Read more
Neighbours comparing possessions with true cost shown
Personal Finance|10 min read

The Real Cost of Keeping Up With the Joneses

Social comparison spending is the fastest way to stay broke. See how redirecting just half of impulse social purchases into investments changes your net worth over time.

10 Aug 2026Read more
Person starting their first jog with C25K app
Health & Fitness|10 min read

How to Start Running: Couch to 5K Calorie Burn

The Couch to 5K programme gets beginners running in 9 weeks. Track your calorie burn at each stage and see how running improves your fitness and weight management.

6 Aug 2026Read more
Timeline comparing 2-year and 5-year mortgage fix periods
Comparisons & Explainers|10 min read

2-Year Fix vs 5-Year Fix: Which Mortgage Deal Is Better Value?

Two-year fixes offer lower rates but more frequent switching costs. Five-year fixes provide certainty at a premium. Compare total costs for your specific situation.

3 Aug 2026Read more
Calculator showing cost per use for different items
Personal Finance|9 min read

How to Calculate Cost per Use for Major Purchases

A £500 item used daily for a year costs £1.37 per use. Apply cost-per-use thinking to spending decisions and you will buy less, buy better, and waste less money.

30 Jul 2026Read more
Tribunal hearing room with process timeline
Salary & Employment|10 min read

What Is the Employment Tribunal Process?

If you have been unfairly dismissed or discriminated against, an employment tribunal may help. Understand the process, time limits, and what compensation you could receive.

27 Jul 2026Read more
Sliding scale showing LTV percentages and corresponding rates
Mortgage & Home Buying|9 min read

How LTV Ratio Affects Your Mortgage Rate

Your loan-to-value ratio is the biggest factor in the interest rate you are offered. Learn how reducing your LTV by just 5% can unlock significantly better deals.

23 Jul 2026Read more
Retirement income waterfall combining state and private pension
Comparisons & Explainers|9 min read

State Pension vs Private Pension: Building a Combined Income

The state pension provides a baseline income while private pensions fill the gap to your desired lifestyle. See how combining both creates a reliable retirement income.

20 Jul 2026Read more