Miacalc

Online Calculators Toolbox

39 free calculators · works instantly · all calculations run locally

Runs locally · no upload Instant · no sign-up 100% free · no ads
Popular UK Mortgage UK Income Tax UK Take-Home Pay Scientific BMI Mortgage Overpayment

Finance8

UK Mortgage Calculator
Monthly repayments and total interest for a repayment or interest-only mortgage, with amortisation schedule.
Mortgage Overpayment Calculator
See interest saved and term cut by overpaying your mortgage each month, with a balance chart.
Car Finance Calculator
Monthly car payment, total interest and balance over time from price, deposit, APR and term.
Compound Interest Calculator
Project investment growth from a starting amount plus monthly contributions, with a growth chart.
Savings Interest Calculator
Interest earned, ending balance and AER for a savings account, ISA or fixed-rate bond, simple or compound.
UK Mortgage Affordability Calculator
How much you can borrow (about 4.5x income) and the maximum property price with your deposit.
Savings Goal Calculator
Monthly amount needed to reach a savings goal by a target date, with optional return.
Debt-to-Income Calculator
Housing and total debt ratios with UK mortgage affordability guidance.

Salary & Tax6

UK Income Tax Calculator
Estimate 2025/26 UK income tax, take-home pay and effective rate by income, with personal allowance taper.
UK Take-Home Pay Calculator
Net salary after income tax, National Insurance and optional pension — per year, month or week.
UK Bonus Tax Calculator
Income tax and National Insurance on a bonus at your marginal rate, plus net take-home.
UK Overtime Pay Calculator
Regular, overtime and total weekly pay using your own overtime multiplier (no UK statutory rate).
Length of Service Calculator
Exact years of service from start date to any date.
UK State Pension Age Calculator
Find your State Pension age and the date you reach it (66 rising to 67 and 68) by date of birth.

Health & Life8

BMI Calculator
Enter your height and weight in stones/pounds or metric to find your BMI and healthy weight range.
Age Calculator
Exact age in years, months and days, plus days to your next birthday and star sign.
Due Date Calculator
Estimate your pregnancy due date and gestational age from your last menstrual period.
Ovulation Calculator
Estimate your ovulation day, fertile window and next period from your cycle.
Body Fat Calculator
Estimate body fat % with the US Navy method and a BMI-based estimate (st/lb or metric).
Calorie Calculator
Find your BMR and TDEE with Mifflin-St Jeor, plus targets to lose or gain weight.
Ideal Weight Calculator
Ideal body weight by Devine, Robinson & Miller plus a healthy BMI range, in st/lb and kg.
Child Height Predictor
Predict a child's adult height from the parents' heights (mid-parental method).

Utilities17

QR Code Generator
Turn a URL or text into a QR code; pick size and error correction; download PNG.
Percentage Calculator
Percent of a number, ratio, and percent change — three calculations in one.
Number to Words Converter
Spell out amounts in pounds and pence for cheques, invoices and contracts.
Discount Calculator
Find the sale price, amount saved and effective percent off.
Geometry Calculator
Area, perimeter and volume for circles, squares, rectangles, triangles and cylinders.
Fuel Economy Calculator (UK MPG)
Imperial MPG, L/100km and km/L plus total fuel cost and cost per mile, using the imperial gallon (4.54609 L).
Countdown Calculator
Find out how many days until (or since) any date.
Base Converter
Convert between binary, octal, decimal and hexadecimal.
GPA Calculator (US 4.0 scale)
Weighted and unweighted GPA on the US 4.0 scale — useful for UK students applying abroad.
Electricity Bill Calculator
Estimate your bill from kWh usage, the unit rate (GBP/kWh) and the daily standing charge (p/day).
Word Counter
Count words, characters, sentences, paragraphs and reading time.
Unix Timestamp Converter
Convert Unix epoch time to a date and back — local and UTC, seconds or milliseconds.
Base64 Encode / Decode
Encode and decode Base64 with UTF-8 (Unicode) support.
Colour Converter
Convert between HEX, RGB and HSL colour codes with a live preview.
Scientific Calculator
Trig, log, powers, roots and pi/e with keypad and keyboard input; degrees or radians.
Unit Converter
Convert length, weight (incl. stones), volume (imperial pints & gallons), temperature, area and data.
Date Calculator
Days between two dates, or add and subtract days from a date.

About Miacalc Online Calculators

Miacalc is a free collection of online calculators for everyday finance, health and productivity, with rules localized for the United Kingdom. Every tool runs entirely in your browser — no sign-up, no download, and no data is uploaded.

Note: results are for reference only. Always confirm with your bank, accountant or local regulations.