P655 TELETEXT-TOOLS 655 Wed 01 Jan
00:00/00PAGE655
TELETEXT-TOOLS
SIMPLE INTEREST

SIMPLE INTEREST SETTINGS

P655
Choose answer type

STEP 1: MODE

INPUT A
SOLVE FOR
I
Choose unknown
ROUNDING
2DP
Final answer only
FORMULA
I = P × r × t
INTEREST
PAGE 1/15

PRINCIPAL AND RATE

P655-2
First two known values

STEP 2: MONEY + RATE

INPUT B
PRINCIPAL
£P
Starting money
RATE
%r
Type 6 for 6%
NEXT
Use NEXT for time, interest and final amount.
Use PREVIOUS to change mode.

TIME AND REVERSE VALUES

P655-3
Second set of known values

STEP 3: TIME + VALUES

INPUT C
TIME
YEARS
Decimals allowed
INTEREST
£I
For reverse modes
FINAL AMOUNT
£A
A = P + I
READY
Press SOLVE, then NEXT for answer and working.
Values update automatically.

SIMPLE INTEREST RESULT

P655-4
Use PREVIOUS to edit values

STEP 4: ANSWER

READY
INTEREST
RESULT
—
WORKING
—
—
—
—
—

WHAT THIS TOOL DOES

This simple interest calculator finds interest, final amount, principal, rate or time.

It uses I = P × r × t, with the rate entered as a percentage and converted to a decimal.

The first four screens separate mode, money, time and working so layouts stay clear.

Canonical folder: /simple-interest-calculator/

HOW TO USE IT

Choose the value you want to find on Page 1.

Enter principal and rate on Page 2.

Enter time, interest or final amount on Page 3.

Use Page 4 for the final answer and working.

SIMPLE INTEREST FORMULAS

INTEREST
I = P × r × t
Use principal, rate as decimal and time in years.
FINAL AMOUNT
A = P + I
Add interest to the starting principal.
PRINCIPAL
P = I ÷ (r × t)
Reverse the formula to find the starting money.
RATE OR TIME
r = I ÷ (P×t)
Multiply r by 100 to show it as a percent.

WORKED EXAMPLES

INTEREST
£500 × 0.06 × 3 = £90
Simple interest is £90.
FINAL AMOUNT
£500 + £90 = £590
Final amount is principal plus interest.
RATE
90 ÷ (500×3) = 0.06
Rate is 6%.
TIME
90 ÷ (500×0.06) = 3
Time is 3 years.

INTEREST MODE

Interest mode is the standard simple interest calculation.

Enter the principal, annual rate and time in years.

The calculator converts the percentage rate into a decimal before multiplying.

The result shows the interest only, not the final amount.

FINAL AMOUNT MODE

Final amount mode calculates the interest first.

It then adds the interest to the starting principal.

This is useful when you want the total balance after simple interest.

It does not compound interest year by year.

REVERSE MODES

Principal mode finds the starting amount from known interest, rate and time.

Rate mode finds the percentage rate from known interest, principal and time.

Time mode finds the number of years from known interest, principal and rate.

Zero values in a divisor will show CHECK rather than a valid answer.

WHO USES IT

Students use it for GCSE maths, finance and percentage revision.

Teachers use it to show formula substitution and rearranging.

Savers use it for quick flat-rate interest examples.

Borrowers use it for simple, non-compounding loan examples.

FAQ

What is simple interest? Interest calculated only on the starting principal.

How do I enter rate? Type 6 for 6%.

What time unit is used? Years, unless you convert months into a decimal year.

Is it compound interest? No. Use Page 656 for compound growth.

SEARCH INTENT

People may search for simple interest calculator, interest calculator or I equals PRT calculator.

Other searches include find principal from interest, calculate interest rate and find time from simple interest.

This page supports those tasks with a working calculator and clear formula pages.

SEO support text is split across full-size panels instead of cramped boxes.

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https://teletext-tools.com/simple-interest-calculator/