About Curta Calculators

A Curta Calculator

A Curta Calculator

What is a Curta Calculator?

A Curta Calculator is a hand-cranked mechanical calculator that fits in the palm of your hand. It was originally sold in 1948 and performs addition, subtraction, multiplication & division operations, With some skill, it is even possible to compute advanced mathematics such as square roots and other operations.

What's amazing about a Curta Calculator is that the entire device operates completely on mechanical power without any electricity to accurately compute an equation. The Curta Calculator utilizes a symphony of gears, sliders & drums to find the solution. Considering it predated most computers, the Curta Calculator is an amazing piece of collectible period engineering.

For a demonstration of the operation of a Curta Calculator, we suggest you check out this video.

Curta Calculators were made in two distinct models: Type 1 and Type 2.

  • Type 1 Curta Calculators are the smaller of the two models and are made of either plastic or metal. Type 1 Curta Calculator models have 8 input registers, a 6 digit crank turn register, and an 11 digit result register. They weigh approximately 8 ounces and were originally sold with a plastic or metal carrying case.
  • Type 2 Curta Calculators are the larger of the two models and are made of either plastic or metal. Type 2 Curta Calculator models have 11 input registers, a 8 digit crank turn register, and an 15 digit result register. They weigh approximately 12 ounces and were originally sold with a plastic or metal carrying case.

Generally, earlier models featured more metal parts than their later counterparts.

Since their introduction, an estimated 140,000 Curta Calculators were made and sold until the early 1970s, when electronic calculators became available. Fortunately, it's still possible to purchase a vintage Curta calculator today. Where? Why the internet of course!

Here are current Curta Calculator listings on eBay:

Curta Type II Mechanical Calculator #512367 in excellent condition
Curta Type II Mechanical Calculator #512367 in excellent condition
$710.00 (2 Bids)
Time Remaining: 3d 14h 28m

Curta Type II Mechanical Calculator 
Curta Type II Mechanical Calculator 
$1,399.00
Time Remaining: 21d 5h 32m
Buy It Now for only: $1,399.00

Rare 1964 Curta Type I mechanical calculator in perfect working order w/can 
Rare 1964 Curta Type I mechanical calculator in perfect working order w/can 
$800.00 (1 Bid)
Time Remaining: 12h 59m
Buy It Now for only: $1,400.00

RARE CURTA Type II Calculator With Case and Book - Excellent Condition
RARE CURTA Type II Calculator With Case and Book - Excellent Condition
$705.00 (5 Bids)
Time Remaining: 4d 7h 26m

Curta Calculator
Curta Calculator
$783.00 (2 Bids)
Time Remaining: 2d 13h

Curta Type II Mechanical Calculator Serial #532547 Good Condition
Curta Type II Mechanical Calculator Serial #532547 Good Condition
$810.00 (2 Bids)
Time Remaining: 4h 57m

Curta Type II Mechanical Calculator, 1961, Excellent Condition
Curta Type II Mechanical Calculator, 1961, Excellent Condition
$500.00 (1 Bid)
Time Remaining: 6d 3h 42m

Curta Mechanical Calculator Type-1 Ser 75586 System Curt Herzstark math drum US
Curta Mechanical Calculator Type-1 Ser 75586 System Curt Herzstark math drum US
$999.00
Time Remaining: 2d 8h 58m

THE CURTA CALCULATOR POSTER
THE CURTA CALCULATOR POSTER
$19.95
Time Remaining: 28d 7h 29m
Buy It Now for only: $19.95

RARE EARLY 1951 ALL BLACK CURTA Type I 1 Calculator Low #15077 Can Leather Case
RARE EARLY 1951 ALL BLACK CURTA Type I 1 Calculator Low #15077 Can Leather Case
$1,500.00
Time Remaining: 6d 5h 37m

Contina Curta Type II Mechanical Calculator No. 538772
Contina Curta Type II Mechanical Calculator No. 538772
$1,799.00
Time Remaining: 29d 12h 45m
Buy It Now for only: $1,799.00

Curta Calculator-Related Patents Full-Image on CD-ROM
Curta Calculator-Related Patents Full-Image on CD-ROM
$19.95
Time Remaining: 17d 4h 51m
Buy It Now for only: $19.95

CURTA Calculator, TYPE  II, #513803, Excellent condition
CURTA Calculator, TYPE II, #513803, Excellent condition
$850.00 (1 Bid)
Time Remaining: 1d 12h 40m

♕♕♕ RARE - Leather Case Canister CURTA Calculator TYPE I - VERY GOOD STATE ♕♕♕
♕♕♕ RARE - Leather Case Canister CURTA Calculator TYPE I - VERY GOOD STATE ♕♕♕
$199.00
Time Remaining: 1d 21h 45m
Buy It Now for only: $199.00

CURTA Calculator, TYPE  I, #64014,  Great gift
CURTA Calculator, TYPE I, #64014, Great gift
$800.00
Time Remaining: 13h 46m

RARE ALPINA UNIVERSAL CALCULATOR INSTRUCTION BOOKLET vs. Curta
RARE ALPINA UNIVERSAL CALCULATOR INSTRUCTION BOOKLET vs. Curta
$250.00
Time Remaining: 3d 21h 59m
Buy It Now for only: $250.00

1952 - Curta Pocket Calculator - C. Herzstark - Patent Art Poster
1952 - Curta Pocket Calculator - C. Herzstark - Patent Art Poster
$9.99
Time Remaining: 3d 7h 56m
Buy It Now for only: $9.99

1952 - Curta Pocket Calculator - C. Herzstark - Patent Art Poster
1952 - Curta Pocket Calculator - C. Herzstark - Patent Art Poster
$14.99
Time Remaining: 3d 7h 56m
Buy It Now for only: $14.99

1952 - Curta Pocket Calculator - C. Herzstark - Patent Art Poster
1952 - Curta Pocket Calculator - C. Herzstark - Patent Art Poster
$21.99
Time Remaining: 3d 7h 56m
Buy It Now for only: $21.99

1952 - Curta Pocket Calculator - C. Herzstark - Patent Art Poster
1952 - Curta Pocket Calculator - C. Herzstark - Patent Art Poster
$14.99
Time Remaining: 3d 7h 56m
Buy It Now for only: $14.99

CURTA Type I (1) Calculator - Serial Number: 55261 - 1963 TENUTO BENE
CURTA Type I (1) Calculator - Serial Number: 55261 - 1963 TENUTO BENE
$1,010.66
Time Remaining: 3h 7m

1952 - Curta Pocket Calculator - C. Herzstark - Patent Art Poster
1952 - Curta Pocket Calculator - C. Herzstark - Patent Art Poster
$21.99
Time Remaining: 3d 7h 56m
Buy It Now for only: $21.99

1952 - Curta Pocket Calculator - C. Herzstark - Patent Art Poster
1952 - Curta Pocket Calculator - C. Herzstark - Patent Art Poster
$32.99
Time Remaining: 3d 7h 56m
Buy It Now for only: $32.99

CURTA Type II (2) Calculator - Serial Number: 521995 - 1962
CURTA Type II (2) Calculator - Serial Number: 521995 - 1962
$1,057.72
Time Remaining: 3h 7m

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