diff --git a/src/include/units/physical/fps/force.h b/src/include/units/physical/fps/force.h
index cbd7e88b..c58fa3df 100644
--- a/src/include/units/physical/fps/force.h
+++ b/src/include/units/physical/fps/force.h
@@ -34,9 +34,12 @@ namespace units::physical::fps {
 struct poundal : named_unit<poundal, "pdl", no_prefix> {};
 
 // https://en.wikipedia.org/wiki/Pound_(force)
-struct pound_force : named_scaled_unit<pound_force, "lbf", no_prefix, ratio<32'174'049, 1'000'000>, poundal> {};
+struct pound_force : named_scaled_unit<pound_force, "lbf", si::prefix, ratio<32'174'049, 1'000'000>, poundal> {};
 
+struct kilopound_force : prefixed_unit<kilopound_force, si::kilo, pound_force> {};
 
+// https://en.wikipedia.org/wiki/Kip_(unit), 
+struct kip : alias_unit<kilopound_force, "klbf", no_prefix> {};
 
 struct dim_force : physical::dim_force<dim_force, poundal, dim_mass, dim_acceleration> {};
 
@@ -53,6 +56,10 @@ constexpr auto operator"" q_pdl(long double l) { return force<poundal, long doub
 constexpr auto operator"" q_lbf(unsigned long long l) { return force<pound_force, std::int64_t>(l); }
 constexpr auto operator"" q_lbf(long double l) { return force<pound_force, long double>(l); }
 
+// kilopound force
+constexpr auto operator"" q_klbf(unsigned long long l) { return force<kilopound_force, std::int64_t>(l); }
+constexpr auto operator"" q_klbf(long double l) { return force<kilopound_force, long double>(l); }
+
 }  // namespace literals
 
 }  // namespace units::physical::fps
diff --git a/src/include/units/physical/fps/length.h b/src/include/units/physical/fps/length.h
index 1c962c08..24cd8466 100644
--- a/src/include/units/physical/fps/length.h
+++ b/src/include/units/physical/fps/length.h
@@ -31,9 +31,11 @@ namespace units::physical::fps {
 // https://en.wikipedia.org/wiki/Foot_(unit)
 struct foot : named_scaled_unit<foot, "ft", no_prefix, ratio<3'048, 1'000, -1>, si::metre> {};
 
+struct inch : named_scaled_unit<inch, "in", no_prefix, ratio<1, 12>, foot> {};
+
 struct yard : named_scaled_unit<yard, "yd", no_prefix, ratio<3, 1>, foot> {};
 
-struct inch : named_scaled_unit<inch, "in", no_prefix, ratio<1, 12>, foot> {};
+struct fathom : named_scaled_unit<fathom, "ftm", no_prefix, ratio<6, 1>, foot> {};
 
 struct mile : named_scaled_unit<mile, "mile", no_prefix, ratio<5'280>, foot> {};
 
@@ -48,19 +50,27 @@ using length = quantity<dim_length, U, Rep>;
 
 inline namespace literals {
 
+// Inch
 constexpr auto operator"" q_in(unsigned long long l) { return length<inch, std::int64_t>(l); }
 constexpr auto operator"" q_in(long double l) { return length<inch, long double>(l); }
 
-// ft
+// Foot
 constexpr auto operator"" q_ft(unsigned long long l) { return length<foot, std::int64_t>(l); }
 constexpr auto operator"" q_ft(long double l) { return length<foot, long double>(l); }
 
+// Yard
 constexpr auto operator"" q_yd(unsigned long long l) { return length<yard, std::int64_t>(l); }
 constexpr auto operator"" q_yd(long double l) { return length<yard, long double>(l); }
 
+// Fathom
+constexpr auto operator"" q_ftm(unsigned long long l) { return length<fathom, std::int64_t>(l); }
+constexpr auto operator"" q_ftm(long double l) { return length<fathom, long double>(l); }
+
+// Mile
 constexpr auto operator"" q_mile(unsigned long long l) { return length<mile, std::int64_t>(l); }
 constexpr auto operator"" q_mile(long double l) { return length<mile, long double>(l); }
 
+// Nautical mile
 constexpr auto operator"" q_naut_mi(unsigned long long l) { return length<nautical_mile, std::int64_t>(l); }
 constexpr auto operator"" q_naut_mi(long double l) { return length<nautical_mile, long double>(l); }
 
diff --git a/src/include/units/physical/fps/mass.h b/src/include/units/physical/fps/mass.h
index 2fe1c738..229f5014 100644
--- a/src/include/units/physical/fps/mass.h
+++ b/src/include/units/physical/fps/mass.h
@@ -36,28 +36,57 @@ struct dim_mass : physical::dim_mass<pound> {};
 template<Unit U, Scalar Rep = double>
 using mass = quantity<dim_mass, U, Rep>;
 
+struct grain : named_scaled_unit<grain, "gr", no_prefix, ratio<1, 7000>, pound>{};
+
+struct dram : named_scaled_unit<dram, "dr", no_prefix, ratio<1, 256>, pound>{};
+
 struct ounce : named_scaled_unit<ounce, "oz", no_prefix, ratio<1, 16>, pound>{};
 
+struct stone : named_scaled_unit<stone, "st", no_prefix, ratio<14, 1>, pound>{};
+
+struct quarter : named_scaled_unit<quarter, "qr", no_prefix, ratio<28, 1>, pound>{};
+
+struct hundredweight : named_scaled_unit<hundredweight, "cwt", no_prefix, ratio<112, 1>, pound>{};
+
 struct short_ton : named_scaled_unit<short_ton, "ton (short)", no_prefix, ratio<2'000, 1>, pound>{};
 
 struct long_ton : named_scaled_unit<long_ton, "ton (long)", no_prefix, ratio<2'240, 1>, pound>{};
 
 inline namespace literals {
 
+// Grain
+constexpr auto operator"" q_gr(unsigned long long l) { return mass<grain, std::int64_t>(l); }
+constexpr auto operator"" q_gr(long double l) { return mass<grain, long double>(l); }
 
+// Dram
+constexpr auto operator"" q_dr(unsigned long long l) { return mass<dram, std::int64_t>(l); }
+constexpr auto operator"" q_dr(long double l) { return mass<dram, long double>(l); }
+
+// Ounce
 constexpr auto operator"" q_oz(unsigned long long l) { return mass<ounce, std::int64_t>(l); }
 constexpr auto operator"" q_oz(long double l) { return mass<ounce, long double>(l); }
 
-
-// lb
+// Pound
 constexpr auto operator"" q_lb(unsigned long long l) { return mass<pound, std::int64_t>(l); }
 constexpr auto operator"" q_lb(long double l) { return mass<pound, long double>(l); }
 
+// Stone
+constexpr auto operator"" q_st(unsigned long long l) { return mass<stone, std::int64_t>(l); }
+constexpr auto operator"" q_st(long double l) { return mass<stone, long double>(l); }
 
+// Quarter
+constexpr auto operator"" q_qr(unsigned long long l) { return mass<quarter, std::int64_t>(l); }
+constexpr auto operator"" q_qr(long double l) { return mass<quarter, long double>(l); }
+
+// Hundredweight
+constexpr auto operator"" q_cwt(unsigned long long l) { return mass<hundredweight, std::int64_t>(l); }
+constexpr auto operator"" q_cwt(long double l) { return mass<hundredweight, long double>(l); }
+
+// Short ton
 constexpr auto operator"" q_ston(unsigned long long l) { return mass<short_ton, std::int64_t>(l); }
 constexpr auto operator"" q_ston(long double l) { return mass<short_ton, long double>(l); }
 
-
+// Long Ton
 constexpr auto operator"" q_lton(unsigned long long l) { return mass<long_ton, std::int64_t>(l); }
 constexpr auto operator"" q_lton(long double l) { return mass<long_ton, long double>(l); }
 
diff --git a/src/include/units/physical/fps/pressure.h b/src/include/units/physical/fps/pressure.h
index 673843ce..7c43d990 100644
--- a/src/include/units/physical/fps/pressure.h
+++ b/src/include/units/physical/fps/pressure.h
@@ -39,10 +39,10 @@ using pressure = quantity<dim_pressure, U, Rep>;
 
 struct pound_force_per_foot_sq : named_scaled_unit<pound_force_per_foot_sq, "lbf ft2", si::prefix, ratio<32'174'049, 1'000'000>, poundal_per_foot_sq> {};
 
-// struct pound_force_per_foot_sq : noble_deduced_unit<pound_force_per_foot_sq, dim_pressure, pound_force, square_ft> {};
-
 struct pound_force_per_inch_sq : named_scaled_unit<pound_force_per_inch_sq, "psi", si::prefix, ratio<1, 144>, pound_force_per_foot_sq> {};
 
+struct kilopound_force_per_inch_sq : prefixed_unit<kilopound_force_per_inch_sq, si::kilo, pound_force_per_inch_sq> {};
+
 inline namespace literals {
 // Poundal per square foot
 constexpr auto operator"" q_pdl_per_ft2(unsigned long long l) { return pressure<poundal_per_foot_sq, std::int64_t>(l); }
@@ -52,6 +52,10 @@ constexpr auto operator"" q_pdl_per_ft2(long double l) { return pressure<poundal
 constexpr auto operator"" q_psi(unsigned long long l) { return pressure<pound_force_per_inch_sq, std::int64_t>(l); }
 constexpr auto operator"" q_psi(long double l) { return pressure<pound_force_per_inch_sq, long double>(l); }
 
+// kilopounds per square inch
+constexpr auto operator"" q_kpsi(unsigned long long l) { return pressure<kilopound_force_per_inch_sq, std::int64_t>(l); }
+constexpr auto operator"" q_kpsi(long double l) { return pressure<kilopound_force_per_inch_sq, long double>(l); }
+
 }  // namespace literals
 
 }  // namespace units::physical::fps