Are all TOOLSAURA calculators free?

Yes. Every calculator on this page is free, runs in your browser, and does not require an account.

How are units and assumptions shown?

Every input displays its measurement unit or selection meaning. The calculator modal also explains the formula or simplifying assumptions used for the estimate.

Can health calculator results diagnose a condition?

No. Health and fitness results are educational estimates or unit conversions. They cannot diagnose illness, replace clinical measurements, or replace advice from a qualified health professional.

How accurate are pregnancy, ovulation and fertility calculators?

They are calendar-based estimates. Cycle variation and ultrasound dating can change the result, so they cannot confirm pregnancy, ovulation, fertile days, fetal sex, or a baby’s actual growth.

Can finance calculator results be used as final financial or tax figures?

Use them as planning estimates. Rates, taxes, fees, compounding rules, and legal requirements vary, so verify high-impact decisions with the relevant provider or qualified professional.

213 Free Calculators | Finance, Education, Health & Date Tools

01

Finance Calculators · Loans & Debt

Loan Calculator

Estimate a fixed-rate loan payment from the amount, annual rate, and term.

Inputs + assumptions explained

02

Finance Calculators · Loans & Debt

EMI Calculator

Calculate the equal monthly installment for a reducing-balance loan.

Inputs + assumptions explained

03

Finance Calculators · Loans & Debt

Mortgage Calculator

Estimate principal-and-interest payments for a home mortgage.

Inputs + assumptions explained

04

Finance Calculators · Interest & Investing

Interest Calculator

Find interest earned or charged using a principal, annual rate, and time.

Inputs + assumptions explained

05

Finance Calculators · Interest & Investing

Compound Interest Calculator

Project a balance with interest compounded at a selected frequency.

Inputs + assumptions explained

06

Finance Calculators · Interest & Investing

Simple Interest Calculator

Calculate non-compounding interest over a chosen number of years.

Inputs + assumptions explained

07

Finance Calculators · Interest & Investing

SIP Calculator

Estimate the future value of regular monthly systematic investments.

Inputs + assumptions explained

08

Finance Calculators · Interest & Investing

Investment Calculator

Project how a lump-sum investment may grow at a steady annual return.

Inputs + assumptions explained

09

Finance Calculators · Business & Tax

ROI Calculator

Measure return on investment as a percentage of the original cost.

Inputs + assumptions explained

10

Finance Calculators · Business & Tax

Profit Margin Calculator

Calculate the percentage of revenue retained after costs.

Inputs + assumptions explained

11

Finance Calculators · Business & Tax

Gross Profit Calculator

Subtract cost of goods sold from revenue to find gross profit.

Inputs + assumptions explained

12

Finance Calculators · Business & Tax

Net Profit Calculator

Estimate earnings left after all business expenses.

Inputs + assumptions explained

13

Finance Calculators · Business & Tax

Break-Even Calculator

Estimate how many units must be sold to cover fixed and variable costs.

Inputs + assumptions explained

14

Finance Calculators · Business & Tax

VAT Calculator

Calculate value-added tax on a net amount using an editable rate.

Inputs + assumptions explained

15

Finance Calculators · Business & Tax

Sales Tax Calculator

Estimate sales tax from a pre-tax price and local rate.

Inputs + assumptions explained

16

Finance Calculators · Business & Tax

Discount Calculator

Find the final price after applying a percentage discount.

Inputs + assumptions explained

17

Finance Calculators · Business & Tax

Markup Calculator

Measure the markup percentage between cost and selling price.

Inputs + assumptions explained

18

Finance Calculators · Business & Tax

Commission Calculator

Calculate commission earnings from sales and a percentage rate.

Inputs + assumptions explained

19

Finance Calculators · Income & Planning

Tip Calculator

Split a bill and tip fairly across any number of people.

Inputs + assumptions explained

20

Finance Calculators · Income & Planning

Budget Calculator

Compare monthly income and expenses to find available cash flow.

Inputs + assumptions explained

21

Finance Calculators · Interest & Investing

Savings Calculator

Project savings from a starting balance and regular monthly deposits.

Inputs + assumptions explained

22

Finance Calculators · Interest & Investing

Inflation Calculator

Estimate the future price of an item after sustained inflation.

Inputs + assumptions explained

23

Finance Calculators · Income & Planning

Currency Converter

Convert an amount with a rate you provide for transparent, offline calculation.

Inputs + assumptions explained

24

Finance Calculators · Income & Planning

Salary Calculator

Convert a monthly salary into an estimated annual gross salary.

Inputs + assumptions explained

25

Finance Calculators · Income & Planning

Hourly Wage Calculator

Convert an annual salary into an approximate hourly wage.

Inputs + assumptions explained

26

Finance Calculators · Income & Planning

Overtime Calculator

Estimate overtime pay using an hourly rate and multiplier.

Inputs + assumptions explained

27

Finance Calculators · Income & Planning

Paycheck Calculator

Estimate take-home pay after taxes and other deductions.

Inputs + assumptions explained

28

Finance Calculators · Business & Tax

Income Tax Calculator

Create a simple editable-rate estimate of income tax.

Inputs + assumptions explained

29

Finance Calculators · Business & Tax

Capital Gains Calculator

Estimate gain and tax after selling an asset above its cost basis.

Inputs + assumptions explained

30

Finance Calculators · Income & Planning

Retirement Calculator

Project retirement savings from a balance, annual contribution, and return.

Inputs + assumptions explained

31

Finance Calculators · Income & Planning

Pension Calculator

Estimate annual defined-benefit pension income from salary and service.

Inputs + assumptions explained

32

Finance Calculators · Income & Planning

Net Worth Calculator

Subtract liabilities from assets for a simple net-worth snapshot.

Inputs + assumptions explained

33

Finance Calculators · Loans & Debt

Debt Payoff Calculator

Estimate how long a fixed monthly payment will take to clear a debt.

Inputs + assumptions explained

34

Finance Calculators · Loans & Debt

Credit Card Payoff Calculator

Estimate payoff time for a credit-card balance at a fixed payment.

Inputs + assumptions explained

35

Finance Calculators · Loans & Debt

APR Calculator

Convert a nominal annual rate into an effective annual percentage rate.

Inputs + assumptions explained

36

Finance Calculators · Interest & Investing

APY Calculator

Calculate annual percentage yield from a nominal rate and compounding frequency.

Inputs + assumptions explained

37

Finance Calculators · Interest & Investing

Dividend Calculator

Estimate annual dividend income from shares owned and dividend per share.

Inputs + assumptions explained

38

Finance Calculators · Interest & Investing

Stock Average Calculator

Find the weighted average share price across two purchases.

Inputs + assumptions explained

39

Finance Calculators · Interest & Investing

Crypto Profit Calculator

Estimate crypto profit or loss after buy price, sell price, quantity, and fees.

Inputs + assumptions explained

40

Health & Fitness Calculators

BMI Calculator

Calculate adult body mass index from weight in kilograms and height in centimetres.

Units + safety note included

41

Health & Fitness Calculators

BMR Calculator

Estimate resting daily energy needs with the Mifflin–St Jeor equation.

Units + safety note included

42

Health & Fitness Calculators

Body Fat Calculator

Estimate body-fat percentage using height and circumference measurements.

Units + safety note included

43

Health & Fitness Calculators

Calorie Calculator

Estimate a daily calorie target from BMR, activity level, and a selected goal adjustment.

Units + safety note included

44

Health & Fitness Calculators

Ideal Weight Calculator

Estimate a reference body weight from height using the Devine formula.

Units + safety note included

45

Health & Fitness Calculators

Lean Body Mass Calculator

Estimate lean body mass from body weight and height using the Boer equation.

Units + safety note included

46

Health & Fitness Calculators

Water Intake Calculator

Estimate daily fluid intake from body weight, exercise time, and climate conditions.

Units + safety note included

47

Health & Fitness Calculators

Heart Rate Calculator

Estimate maximum heart rate and moderate-to-vigorous training zones from age.

Units + safety note included

48

Health & Fitness Calculators

Blood Pressure Calculator

Classify an adult blood-pressure reading using systolic and diastolic values.

Units + safety note included

49

Health & Fitness Calculators

Blood Sugar Converter

Convert blood-glucose values between mg/dL and mmol/L without interpreting the result.

Units + safety note included

50

Health & Fitness Calculators

BAC Calculator

Estimate blood alcohol concentration from standard drinks, body weight, time, and a distribution factor.

Units + safety note included

51

Health & Fitness Calculators

Macro Calculator

Split a daily calorie target into protein, carbohydrate, and fat grams.

Units + safety note included

52

Health & Fitness Calculators

Protein Calculator

Estimate daily protein grams from body weight and a transparent grams-per-kilogram target.

Units + safety note included

53

Health & Fitness Calculators

Carb Calculator

Convert a chosen carbohydrate percentage of daily calories into grams.

Units + safety note included

54

Health & Fitness Calculators

Fat Intake Calculator

Convert a chosen fat percentage of daily calories into grams.

Units + safety note included

55

Health & Fitness Calculators

TDEE Calculator

Estimate total daily energy expenditure from BMR and a selected activity factor.

Units + safety note included

56

Health & Fitness Calculators

Waist-to-Hip Ratio Calculator

Calculate waist-to-hip ratio from measurements taken in the same unit.

Units + safety note included

57

Health & Fitness Calculators

One Rep Max Calculator

Estimate one-repetition maximum from a lifted weight and completed repetitions.

Units + safety note included

58

Health & Fitness Calculators

Running Pace Calculator

Calculate average pace per kilometre and speed from distance and elapsed time.

Units + safety note included

59

Health & Fitness Calculators

Walking Calories Calculator

Estimate calories used during walking from body weight, duration, and a selected MET level.

Units + safety note included

60

Health & Fitness Calculators

Cycling Calories Calculator

Estimate calories used during cycling from body weight, duration, and intensity.

Units + safety note included

61

Health & Fitness Calculators

Swimming Calories Calculator

Estimate calories used during swimming from body weight, duration, and effort.

Units + safety note included

62

Health & Fitness Calculators

Step to Calories Calculator

Estimate calories associated with a step count using body weight and an intensity factor.

Units + safety note included

63

Health & Fitness Calculators

Sleep Calculator

Find suggested bedtimes based on a wake time, sleep latency, and 90-minute sleep-cycle estimates.

Units + safety note included

64

Health & Fitness Calculators

Smoking Cost Calculator

Estimate monthly, annual, and long-term cigarette spending from pack price and usage.

Units + safety note included

65

Health & Fitness Calculators

Life Expectancy Calculator

Estimate a transparent lifespan scenario from an official baseline and an adjustment you enter.

Units + safety note included

66

Pregnancy & Baby Calculators

Pregnancy Due Date Calculator

Estimate a pregnancy due date from the first day of the last menstrual period and usual cycle length.

Dates + medical limitation included

67

Pregnancy & Baby Calculators

Pregnancy Week Calculator

Estimate gestational age in completed weeks and days from the first day of the last menstrual period.

Dates + medical limitation included

68

Pregnancy & Baby Calculators

Pregnancy Weight Gain Calculator

Compare current weight gain with the full-pregnancy range associated with pre-pregnancy BMI and singleton or twin pregnancy.

Dates + medical limitation included

69

Pregnancy & Baby Calculators

Ovulation Calculator

Estimate an ovulation date from the first day of a period, usual cycle length, and luteal-phase assumption.

Dates + medical limitation included

70

Pregnancy & Baby Calculators

Fertility Calculator

Estimate a calendar-based fertile range around a predicted ovulation date.

Dates + medical limitation included

71

Pregnancy & Baby Calculators

Baby Gender Predictor

Generate an entertainment-only boy or girl guess from conception date and age at conception.

Dates + medical limitation included

72

Pregnancy & Baby Calculators

Child Height Predictor

Estimate a child’s adult height from measured parental heights using the mid-parental method.

Dates + medical limitation included

73

Date & Time Calculators

Age Calculator

Calculate age from birth date.

Dates + time details explained

74

Date & Time Calculators

Date Calculator

Calculate the difference between two dates.

Dates + time details explained

75

Date & Time Calculators

Time Calculator

Add or subtract time values.

Dates + time details explained

76

Date & Time Calculators

Day Calculator

Find the day of the week for any date.

Dates + time details explained

77

Date & Time Calculators

Week Calculator

Convert dates into week counts.

Dates + time details explained

78

Date & Time Calculators

Month Calculator

Calculate months between dates.

Dates + time details explained

79

Date & Time Calculators

Year Calculator

Calculate years between dates.

Dates + time details explained

80

Date & Time Calculators

Birthday Calculator

Find your next birthday details.

Dates + time details explained

81

Date & Time Calculators

Anniversary Calculator

Calculate anniversary milestones.

Dates + time details explained

82

Education Calculators · Students Calculators