Welcome to SimpleCalc.co
Instant answers to life's number questions — mortgages, health, tax, savings, and more. Free, fast, and beautifully simple.
★ New tool
Find cheapest petrol & diesel along your route
Free • Live UK fuel data from Asda, Sainsbury's, Shell, Esso & more • Updated every 30 minutes
★ New
Quizzes
Find out where you sit on UK politics, take the most-validated personality test in psychology, brain-stretch your reasoning — all free, no signup.
Which UK political party are you closest to?
Answer 25 questions on tax, NHS, immigration, climate, Brexit and more — find out which UK party your views align with.
~6 min · 25 questions
Which US political tribe are you in? (2026 Midterms)
25 questions on tax, healthcare, guns, abortion, climate, immigration and culture wars — find out which of the six US political tribes you align with for the 2026 midterms.
~6 min · 25 questions
Which 2028 US Presidential candidate are you closest to?
20 questions on Trump, Ukraine, immigration, abortion, free speech and more — find out which of eleven real (and aspirationally real) 2028 candidates your views align with.
~5 min · 20 questions
Logic & Reasoning Quiz
15 brain-bending questions on number sequences, verbal analogies, pattern recognition and logical deduction. How sharp is your reasoning today?
~9 min · 15 questions
Big Five Personality Test
50 questions on how you typically think, feel and behave — measured against the five most validated personality dimensions.
~7 min · 50 questions
Are you suited to being a parent?
A light-hearted 15-question quiz on patience, sleep tolerance, mess tolerance, finance and emotional capacity. Just for fun.
~4 min · 15 questions
Oxford Maths Admissions Test — Sample
10 questions adapted from past Oxford MAT papers. Pitched at A-level Maths and Further Maths students considering the most competitive UK Maths degrees.
~25 min · 10 questions
UK History — General Knowledge
15 questions across British history from the Romans to the Brexit referendum. How well do you know your country's past?
~7 min · 15 questions
Science — General Knowledge
15 questions across physics, chemistry, biology and astronomy.
~7 min · 15 questions
World Geography — General Knowledge
15 questions on capitals, countries, oceans, mountains and rivers around the world.
~7 min · 15 questions
★ New
Games
Daily puzzles to spend five minutes on. Same puzzle for everyone — compare with friends.
Financial
Mortgage Calculator
Estimate your monthly mortgage payments.
Retirement Planner
See if your savings are on track for your goals.
Debt Payoff
The fastest timeline to be completely debt free.
Mortgage Payoff
Save years of interest with overpayments.
House Affordability
Calculate what home price you can afford.
Rent vs. Buy
Find your break-even point for home ownership.
Investment Calculator
Project your investment growth over time.
Compound Interest
Calculate the future value of your savings.
Savings Goal
How long until you reach your target amount?
Currency Converter
Real-time foreign exchange rates and conversion.
Personal Loan
Estimate monthly payments for any personal loan.
Net Worth Calculator
Calculate your net worth from assets and liabilities.
Inflation Projection
Track your purchasing power across decades.
Loan vs. Lease
Compare the net cost of buying versus leasing.
Salary (UK)
Net salary and tax breakdown for the UK.
Salary (US)
Net salary and tax breakdown for the US.
Tip Calculator
Split the bill and calculate gratuity instantly.
Remortgage
Switch deals and save on your monthly payments.
First-Time Buyer
Specialized tools for your first property.
Business & Taxes
Health & Fitness
BMI Calculator
Body Mass Index weight vs height screening.
Body Fat %
Estimate composition using US Navy method.
Maintenance Calories
Estimate your daily calorie needs (TDEE).
Calorie Deficit
Calculate targets for your weight loss goals.
Macro Calculator
Daily protein, carb, and fat breakdown.
Water Intake
Personalized daily hydration guidelines.
Pregnancy Due Date
Estimate your baby’s birthday and timeline.
Fertility Tracker
Predict your most fertile days and ovulation.
Ideal Weight
Find your healthy range using the Hamwi formula.
Date & Time
Days Until Christmas
The big seasonal countdown is here!
World Clock
Real-time clocks for your favorite locations.
Time Zone Converter
Convert specific times between global regions.
Birthday & Age
Find your exact age in days, weeks, and years.
Time to Retirement
A precise countdown until you stop working.
Date Difference
Calculate the exact time between two dates.
Custom Countdown
Track the days until your special event.
Date Add/Subtract
Find specific future or past calendar dates.
Timer & Stopwatch
High precision countdowns and tracking.
Math & Utilities
Basic Calculator
A standard digital calculator for everyday use.
Percentage Of
Find out what X% of Y is instantly.
Percentage Change
Calculate growth or decline between values.
Unit Converter
Length, weight, and volume conversions.
Password Generator
Secure, high-entropy random passwords.
Dice Roller
Roll virtual dice for games or decisions.