Background: Multiple paraemters are used to measure gestational age by ultrasound , but when routine parametrs are not applicable fetal foot length by literature is a good alternative. Also femur/foot length ratio can be used to access skeletal dysplasia. Material and method: 62 singleton women with 15–40 weeks gestation were included and fetal foot length along with routine parameters were measured. Femur/foot length ratio was also calculated. Results: Simple linear regression showed a linear relationship between foot length and gestational age with correlation factor of 0.9785 and P=0.000 and between foot length and femur length with significant correlation with r²=0.9797 and P=0.000. The fetal femur length/foot length ratio was found to be more than or equal to 0.92 and constant throughout gestation. Conclusions: Foetal foot length is a reliable parameter for assessment of gestational age and femur length/foot length ratio is approximately 1